Systems and methods for additive manufacturing of objects

Abstract

To provide an improved lamination molding technique such as a powder bed lamination molding suitable for manufacturing an object with a composition gradient.SOLUTION: A method for lamination molding an object comprises the steps of: (1) selectively depositing build powder inside of a build contour of the object to form a build-powder section of a powder layer; and (2) selectively depositing support powder outside of the build contour to form a support-powder section of the powder layer. According to the method, the build powder includes a build-powder composition, the support powder includes a support-powder composition, and the build-powder composition and the support-powder composition are different.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates generally to additive manufacturing, and more particularly to systems and methods for powder bed additive manufacturing, and more particularly to powder bed additive manufacturing systems and methods used to fabricate objects having compositional gradients. [Background technology]

[0002] Additive manufacturing, also known as layered manufacturing and 3D printing, is the process of creating objects by joining materials together, as opposed to subtractive manufacturing. Additive manufacturing has a variety of applications, from rapid prototyping to the production of end-use products. At a basic level, additive manufacturing techniques are based on the concept of building material cross-sectionally, layer by layer, to form a 3D object. Common to additive manufacturing techniques is the use of 3D modeling software (computer-aided design or CAD), machine equipment, and layered materials. Once a CAD model is created, the machine reads the data from the CAD file and creates the 3D object using successive layers of the desired layered material.

[0003] One category of additive manufacturing is powder bed additive manufacturing. Powder bed additive manufacturing uses a powder bed to bond layers of powder in a build-up step to create a 3D object. In powder bed additive manufacturing, a layer of powder in the powder bed is bonded to an underlying layer of the object, adding a new layer to the object. A new layer of powder is deposited in the powder bed and on top of a previously formed layer of the object, and a new layer of powder is similarly bonded to the object. The deposition and bonding procedure is repeated multiple times to create multiple layers on the object, ultimately forming the object.

[0004] Additive manufacturing offers certain advantages over traditional manufacturing techniques. Unlike traditional manufacturing techniques, additive manufacturing offers greater design freedom and is not limited by geometric constraints. Additive manufacturing can also simplify and reduce the costs associated with manufacturing an object compared to traditional manufacturing techniques. However, additive manufacturing has several drawbacks. For example, powder bed additive manufacturing does not use a large amount of powder in the powder bed to form an object. This unused powder either represents wasted material or must be collected and recycled. Furthermore, traditional powder bed additive manufacturing techniques may not be suitable for manufacturing objects with compositional gradients. Therefore, those skilled in the art continue to conduct research and development efforts to provide improved additive manufacturing techniques, such as powder bed additive manufacturing. Summary of the Invention [Means for solving the problem]

[0005] The following is a non-exhaustive list of examples of subject matter according to the present disclosure, which may or may not be claimed.

[0006] In one example, a disclosed method for additively manufacturing an object includes (1) selectively depositing build powder inside a build outline of the object to form a build powder section of the powder layer, and (2) selectively depositing support powder outside the build outline to form a support powder section of the powder layer, wherein the build powder comprises a build powder composition and the support powder comprises a support powder composition, and the build powder composition and the support powder composition are different.

[0007] In one example, a disclosed method for additively manufacturing an object includes (1) selectively depositing build powder inside a build outline of an object to form a build powder section of the powder layer, (2) selectively varying a build powder composition of the build powder to achieve a powder gradient within the build powder section of the powder layer, and (3) selectively depositing support powder outside the build outline to form a support powder section of the powder layer, wherein the build powder comprises a build powder composition and the support powder comprises a support powder composition, and the build powder composition and the support powder composition are different.

[0008] In one example, the disclosed additive manufacturing system includes a powder deposition apparatus configured to selectively deposit build powder inside a build outline to form a build powder section of the powder layer and to selectively deposit support powder outside the build outline to form a support powder section of the powder layer. The build powder includes a build powder composition. The support powder includes a support powder composition. The build powder composition and the support powder composition are different.

[0009] Other examples of the disclosed systems and methods will become apparent from the following detailed description, the accompanying drawings, and the appended claims. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a flow diagram of an example method for additive manufacturing an object. [Figure 2] FIG. 1 is a schematic diagram of an example additive manufacturing system in which a powder layer is formed by a build powder and a support powder. [Figure 3] FIG. 1 is a schematic diagram of an example additive manufacturing system in which object layers are formed from build powders. [Figure 4] FIG. 1 is a schematic diagram of an example additive manufacturing system in which a second powder layer is formed by build powder and support powder on the underlying powder layer and object layer. [Figure 5] FIG. 1 is a schematic diagram of an example additive manufacturing system in which an object is fully formed. [Figure 6] 1 is a schematic diagram of an example of a construction geometry. [Figure 7] 1 is a schematic diagram of an example powder layer. [Figure 8] FIG. 10 is a schematic diagram of an example of a support powder section of the powder layer formed before the building powder section of the powder layer. [Figure 9] FIG. 10 is a schematic diagram of an example of a build powder section of a powder layer formed before a support powder section of the powder layer. [Figure 10] 1A-1C are schematic diagrams of example object layers formed by fusing build powders. [Figure 11] 1A-1C are schematic diagrams of example object layers formed by combining build powders. [Figure 12] FIG. 1B is a schematic diagram of an example of a second powder layer formed on an underlying powder layer and an object layer. [Figure 13] 1 is a schematic diagram of an example of a second object layer formed on an underlying object layer. [Figure 14] FIG. 1 is a schematic diagram of an example powder sprayer for an additive manufacturing system. [Figure 15] FIG. 1 is a schematic diagram of an example powder sprayer for an additive manufacturing system. [Figure 16] FIG. 1 is a schematic diagram of an example recoater of an additive manufacturing system. [Figure 17] FIG. 10 is a schematic diagram of an example of a powder gradient formed in the build powder section of the powder layer. [Figure 18] FIG. 1 is a schematic diagram of an example powder sprayer for an additive manufacturing system. [Figure 19] FIG. 1B is a schematic diagram of an example of a second powder layer formed on an underlying powder layer, an object layer, and a support layer. [Figure 20] 2 is a schematic diagram of an example of a second object layer formed on an underlying object layer and a support layer. [Figure 21] FIG. 1B is a schematic diagram of an example of a second powder layer formed on an underlying powder layer, an object layer, and an intermediate support powder layer. [Figure 22] FIG. 1 is a schematic diagram of an example of a second object layer formed on an underlying object layer and an intermediate support powder layer. [Figure 23]FIG. 1 is a schematic diagram of an example additive manufacturing system in which a barrier is formed. [Figure 24] FIG. 1 is a schematic diagram of an example additive manufacturing system in which a powder layer is formed inside a barrier. [Figure 25] 1 is a schematic diagram of an example of a barrier formed by depositing a wiring. [Figure 26] 1 is a schematic diagram of an example of a powder layer formed inside a barrier. [Figure 27] 1 is a schematic diagram of an example of a barrier formed by bonding support powders. [Figure 28] 1 is a schematic diagram of an example of a powder layer formed inside a barrier. [Figure 29] 1 is a flow diagram of an aircraft manufacturing and service method. [Figure 30] FIG. 1 is a schematic block diagram of an example aircraft. DETAILED DESCRIPTION OF THE INVENTION

[0011] The following detailed description refers to the accompanying drawings, which illustrate particular examples of the subject matter disclosed herein. Other examples having different structures and operations do not depart from the scope of the present disclosure. Similar reference numerals may refer to the same features, elements, or components in different drawings.

[0012] Illustrative, non-exhaustive examples of the subject matter disclosed herein, which may or may not be claimed, are provided below. Reference herein to an "example" means that one or more features, structures, elements, components, properties, and / or operational steps described in connection with the example are included in at least one aspect, embodiment, and / or implementation of the subject matter disclosed herein. Thus, throughout this disclosure, the phrases "one example," "another example," "one or more examples," and similar terms may, but do not necessarily, refer to the same example. Furthermore, subject matter characterizing any one example may, but does not necessarily, include subject matter characterizing other examples. Furthermore, subject matter characterizing any one example may, but does not necessarily, be combined with subject matter characterizing other examples.

[0013] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the disclosed concepts, which may be practiced without some or all of these details. In other instances, details of well-known devices and / or processes are omitted to avoid unnecessarily obscuring the disclosure. While some concepts will be described in connection with specific examples, it will be understood that these examples are not intended to be limiting.

[0014] 1-28 , by way of example, the present disclosure is directed to a method 1000 for additively manufacturing an object 100 and an additive manufacturing system 200 used to additively manufacture the object 100. According to one or more examples, the method 1000 utilizes the additive manufacturing system 200. In particular, the method 1000 and the additive manufacturing system 200 are implementations of a powder bed additive manufacturing process used to create the object 100.

[0015] Object 100 refers to an object produced using additive manufacturing system 200 and method 1000, and includes any article, part, component, or other three-dimensional structure that has been produced by a powder bed additive manufacturing process.

[0016] 2-5 , according to the additive manufacturing system 200 and method 1000, in one or more examples, a powder layer 106 is formed in a powder bed 144 ( FIG. 2 ). A portion of the powder layer 106 is bonded to form an object layer 134 of the object 100 ( FIG. 3 ). A second powder layer 126 is formed in the powder bed 144, overlying the previously formed powder layer 106 and object layer 134 ( FIG. 4 ). A portion of the second powder layer 126 is bonded to the object layer 134 below the second powder layer 126, adding a new object layer to the object 100. This forming and bonding procedure is repeated multiple times to form multiple object layers, and ultimately to produce the object 100 ( FIG. 5 ).

[0017] The present disclosure recognizes that powder used to fabricate objects by powder bed additive manufacturing can be an expensive material, and that reducing waste of such powder is desirable. The present disclosure also recognizes that some of the powder outside the build outline is not bonded to form cross-sectional layers of the object, serving the purpose of supporting the portion of the powder used to form the cross-sectional layers of the object. The present disclosure further recognizes that recycling unused portions of powder (portions of powder that are not bonded when forming the object) can be difficult or cumbersome. Accordingly, one or more examples of additive manufacturing system 200 and method 1000 provide techniques for selectively depositing different types of powder to form powder layers, resulting in less wasted powder used to fabricate object 100, reducing costs, shortening cycle time, and improving process efficiency.

[0018] 1 , the method 1000 includes selectively depositing (block 1002) build powder 102 inside a build contour 112 of the object 100 to form a build powder section 108 of the powder layer 106. The build powder 102 includes any powder material suitable for being joined layer by layer to create the object 100. Examples of build powder 102 include, but are not limited to, metal powders, metal alloy powders, ceramic powders, polymer powders, etc.

[0019] The method 1000 also includes selectively depositing support powder 104 (block 1004) outside of the build shape 112 to form the support powder section 110 of the powder layer 106. The support powder 104 includes any powder material suitable for supporting the build powder 102 without being bonded to the build powder 102. Examples of support powder 104 include, but are not limited to, metal powders, metal alloy powders, ceramic powders, polymer powders, etc.

[0020] The build powder 102 includes a build powder composition, and the support powder 104 includes a support powder composition. The build powder composition and the support powder composition are different. In other words, the build powder 102 and the support powder 104 are different types of powder layer materials. Using different types of powder materials in the powder layer 106 of the powder bed 144 allows the different powder materials to be used for different purposes. According to the method 1000 and the additive manufacturing system 200, the build powder 102 is used to form the object layer 134, and the support powder 104 is used to provide a base on which the build powder 102 is supported during the formation of the object layer 134.

[0021] The build powder composition of the build powder 102 is selected based on various factors, including, but not limited to, the desired material composition of the object 100, the desired structural characteristics of the object 100, the desired functional characteristics of the object 100, and the type of joining process used to join the build powder 102 to create the object 100. The support powder composition of the support powder 104 is selected based on various factors, including, but not limited to, recyclability, cost, and the type of joining process used to join the build powder 102 to create the object 100.

[0022] In one or more examples, the type of powder material used for the build powder 102 may also be based on other factors such as, but not limited to, the isotropy of the powder material and the resulting part (e.g., object 100) produced using the build powder 102; the as-printed surface roughness of the resulting part; the bonding ability of the powder material to different materials; its ability to be exposed to various chemicals, fuels, and cleaning agents; and whether the powder material needs to be stored and / or handled in an inert environment; among others.

[0023] In one or more examples, the type of powder material used for the support powder 104 may also be based on other factors such as, but not limited to, the ability to decompose or dissolve the material; the ability of the support formed on the support powder 104 to maintain its shape, temperature capability, and rigidity, among others.

[0024] 2-5 and 9 , the additive manufacturing system 200 includes a powder deposition apparatus 202. The powder deposition apparatus 202 is configured to selectively deposit build powder 102 inside a build shape 112 to form a build powder section 108 of the powder layer 106. The powder deposition apparatus 202 is also configured to selectively deposit support powder 104 outside the build shape 112 to form a support powder section 110 of the powder layer 106.

[0025] In one or more examples, the additive manufacturing system 200 includes a build chamber 260 and a build platform 262 within the build chamber 260. For purposes of illustration, the front wall (or front rail) of the build chamber 260 is omitted from FIGS. 2-5. The build platform 262 is provided to support the powder bed 144 and the object 100 ( FIG. 5 ) fabricated via the powder bed additive manufacturing process. The build chamber 260 provides a peripheral boundary for the build platform 262. In one or more examples, the build chamber 260 provides a peripheral boundary for the powder bed 144. In one or more examples, a seal (not shown) contacts the build platform 262 and the build chamber 260 to ensure that the build powder 102 and the support powder 104 remain within the build chamber 260 during the formation of the object 100.

[0026] Although the illustrative example depicts the build chamber 260 and build platform 262 as having a square cross section, in other examples, the build chamber 260 and build platform 262 may have any geometric shape with a closed cross section, such as a circle, an oval, a rectangle, etc.

[0027] 2 and 6-9 , in one or more examples, the powder deposition apparatus 202 selectively deposits build powder 102 at a first location on the build platform 262 inside the build outline 112 to form the build powder section 108 of the powder layer 106. The powder deposition apparatus 202 selectively deposits support powder 104 at a second location on the build platform 262 outside the build outline 112 to form the support powder section 110 of the powder layer 106.

[0028] In one or more examples, the method 1000 and the additive manufacturing system 200 convert a three-dimensional (3D) model into two-dimensional (2D) layers. The method 1000 and the additive manufacturing system 200 utilize a computer numerically controlled (CNC) build process to selectively deposit the build powder 102 at a first location and the support powder 104 at a second location according to a pre-programmed structure shape of each 2D layer and a pre-programmed tool path (e.g., G-code) of the powder deposition device 202. The first location inside the build outline 112 corresponds to the build shape of the 2D layer of the 3D model.

[0029] 6 , the build outline 112 marks the limits of the area formed by the build powder 102 or refers to the boundary between the build powder section 108 and the support powder section 110 of the powder layer 106. The build outline 112 can have any two-dimensional shape. Generally, the two-dimensional shape of the build outline 112 approximates or is equal to the object outline 146 of the associated cross-sectional layer (e.g., object layer 134) of the object 100 ( FIGS. 4 , 10 , and 11 ). The object outline 146 can have any two-dimensional shape and forms the peripheral boundary of the associated cross-sectional layer (e.g., object layer 134) of the object 100. In other words, the build outline 112 corresponds to the near-net shape of the associated cross-sectional layer of the object 100.

[0030] 1 , in one or more examples, according to the method 1000, the step of selectively depositing the support powder 104 (block 1004) occurs before the step of selectively depositing the build powder 102 (block 1002). Thus, in one or more examples, the powder deposition apparatus 202 is configured to selectively deposit the support powder 104 before the selective deposition of the build powder 102, as shown in FIGS. 7 and 8. In these examples, the support powder boundary 114 of the support powder section 110 of the powder layer 106 forms the build outline 112, and the build powder boundary 116 of the build powder section 108 of the powder layer 106 is adjacent to the support powder boundary 114 of the support powder section 110 of the powder layer 106.

[0031] 1 , in one or more examples, according to the method 1000, the step of selectively depositing the build powder 102 (block 1002) occurs before the step of selectively depositing the support powder 104 (block 1004). Thus, in one or more examples, the powder deposition apparatus 202 is configured to selectively deposit the build powder 102 before the support powder 104 is selectively deposited, as shown in FIGS. 7 and 9. In these examples, the build powder boundary 116 of the build powder section 108 of the powder layer 106 forms the build contour 112, and the support powder boundary 114 of the support powder section 110 of the powder layer 106 is adjacent to the build powder boundary 116 of the build powder section 108 of the powder layer 106.

[0032] In other examples, the step of selectively depositing the build powder 102 (block 1002) and the step of selectively depositing the support powder 104 (block 1004) occur simultaneously. Thus, in one or more examples, the powder deposition apparatus 202 is configured to selectively deposit the build powder 102 while the support powder 104 is selectively deposited.

[0033] By selectively depositing build powder 102 at a first location inside build shape 112, the build powder 102 is positioned where needed to form object layer 134 (a cross-sectional layer of object 100). Similarly, by selectively depositing support powder 104 at a second location outside build shape 112, the support powder 104 is positioned where needed to support build powder 102 as it forms object layer 134 of object 100.

[0034] In one or more examples, the object 100 is composed of an aerospace material, such as a metal alloy or a fiber-reinforced resin material. Accordingly, the build powder composition of the build powder 102 includes the same aerospace material in powder form, which may be relatively rare and / or expensive. The support powder 104 is composed of a more abundant and / or less expensive material in powder form. According to the additive manufacturing system 200 and method 1000, the amount of build powder 102 used to form the powder layer 106 is limited to the amount needed from the object layer 134 (e.g., a cross-sectional layer of the object 100), which reduces the amount of wasted build powder 102. Because the support powder 104 is not used to form an object in a subsequent use, it can be easily recycled. In situations where the support powder 104 cannot be recycled, the costs associated with the wasted amount of support powder 104 are significantly lower than the costs associated with the wasted amount of build powder 102.

[0035] 1 , in one or more examples, the method 1000 includes bonding (block 1006) the build powders 102 of the build powder section 108 of the powder layer 106 to form the object layer 134. Accordingly, as shown in FIGS. 2-5 , 10 and 11 , in one or more examples, the additive manufacturing system 200 includes a powder bonding apparatus 212. The powder bonding apparatus 212 is configured to bond the build powders 102 of the build powder section 108 of the powder layer 106 to form the object layer 134.

[0036] 1 , in one or more examples, according to the method 1000, joining the build powders 102 in the build powder section 108 of the powder layer 106 (block 1006) includes melting the build powders 102 in the build powder section 108 to form the object layer 134, for example, using an energy beam 218. Thus, as shown in FIG. 10 , in one or more examples, the powder joining apparatus 212 includes a directed energy device 252. The directed energy device 252 is configured to generate the energy beam 218 and direct the energy beam 218 at the build powder 102. The energy beam 218 is adapted to fuse the build powders 102 in the build powder section 108 of the powder layer 106 to form a solid cross-sectional layer of the object 100 (e.g., the object layer 134).

[0037] Examples of methods 1000 and additive manufacturing systems 200 utilizing directed energy devices 252 to fuse the build powder 102 include direct metal laser sintering (DMLS), direct metal laser melting (DMLF), selective laser sintering (SLS), selective laser fusion (SLF), and electron beam melting (EBM). In these processes, a directed energy device 252 (e.g., a laser beam generator or an electron beam generator) is used to apply an energy beam 218 (e.g., a laser beam or an electron beam) that melts or sinters the build powder 102 into a solid layer of material. The type of fusion process, the type of directed energy device 252 used, and / or the type of energy beam 218 used to fuse the build powder 102 can depend on various factors, such as, but not limited to, the build powder composition of the build powder 102, the object 100 being manufactured, and the like.

[0038] In one or more examples, different powder materials or different powder compositions of the build powder 102 may have processing parameters. In one or more examples, the controller 250 (FIGS. 2-5) is configured to execute an iterative process embedded in program instructions (e.g., code) that controls the energy beam 218, the power of the directed energy device 252, and other build parameters, and is configured to vary the processing parameters based on the properties, amounts, and primarily melting points of the powder components used in the build powder 102. As described in more detail herein, in one or more examples, the build powder composition of the build powder 102 may vary within a given one of the multiple powder layers to create a powder gradient within the powder layer. For example, the build powder 102 forming the build powder section 108 of the powder layer 106 may include varying percentages of a first component and a second component. If there is a greater amount (e.g., a greater percentage) of the first component in the build powder 102, the power, and therefore the temperature, required to melt the build powder 102 may be lower than if there is a greater amount (e.g., a greater percentage) of the second component. Thus, in one or more examples, more power and a higher temperature may be required to bond (e.g., melt and bond) components of one composition ratio than components of a different composition ratio to build different sections of a cross-sectional layer (e.g., object layer 134) of the object 100. In one or more examples, as the composition of the build powder 102 is changed, the process parameters are cycled through by the controller 250 and a look-up table of values for the parameters at particular known composition levels.

[0039] 1 , in one or more examples, according to the method 1000, bonding the build powders 102 in the build powder section 108 of the powder layer 106 (block 1006) includes, for example, bonding the build powders 102 in the build powder section 108 using a binder 220. Thus, as shown in FIG. 11 , in one or more examples, the powder bonding apparatus 212 includes a binder delivery device 254. The binder delivery device 254 is configured to deposit the binder 220 onto the build powder 102. The binder 220 is suitable for bonding the build powders 102 in the build powder section 108 of the powder layer 106 to form a solid cross-sectional layer of the object 100 (e.g., the object layer 134).

[0040] An example of the method 1000 and additive manufacturing system 200 utilizing the binder delivery device 254 to bind the build powder 102 includes binder jetting. In this process, the binder delivery device 254 (e.g., an inkjet printhead) is used to apply a binder 220 (e.g., a binding agent) that binds the build powder 102 into a solid layer of material. After the object 100 is fully formed, it is encapsulated in the support powder 104 and left to harden and gain strength. In one or more examples, a post-processing step may be required. For example, the object 100 may need to be heat-treated to improve mechanical properties and / or reduce porosity.

[0041] 2-5 , in one or more examples, the build platform 262 is movable relative to the powder deposition apparatus 202 and the powder bonding apparatus 212. In one or more examples, the build platform 262 moves vertically (e.g., lowers) within the build chamber 260 relative to the powder deposition apparatus 202 and the powder bonding apparatus 212 as successive layers of the object 100 are formed. In one or more examples, the build platform 262 moves horizontally relative to the powder deposition apparatus 202 as the powder layer 106 is formed and / or relative to the powder bonding apparatus 212 as the object layer 134 is formed. In one or more examples, the build platform 262 rotates about a vertical axis relative to the powder deposition apparatus 202 as the powder layer 106 is formed and / or relative to the powder bonding apparatus 212 as the object layer 134 is formed.

[0042] In one or more examples, the additive manufacturing system 200 includes a build platform actuator 280 coupled to the build platform 262 and configured to drive movement of the build platform 262. In one or more examples, the build platform actuator 280 includes or takes the form of a linear actuator. In one or more examples, the build platform actuator 280 includes a turntable coupled to the build platform 262.

[0043] In one or more examples, the powder deposition apparatus 202 is movable relative to the build platform 262. In one or more examples, the powder deposition apparatus 202 moves vertically (e.g., rises) relative to the build platform 262 as successive layers of the object 100 are formed. In one or more examples, the powder deposition apparatus 202 moves horizontally relative to the build platform 262 as the powder layers 106 are formed. In one or more examples, the powder deposition apparatus 202 has multiple degrees of freedom to accommodate multi-axis movement for depositing the build powder 102 and support powder 104 anywhere on the build platform 262.

[0044] In one or more examples, the additive manufacturing system 200 includes a powder deposition actuator 282 coupled to the powder deposition apparatus 202 and configured to drive movement of the powder deposition apparatus 202. In one or more examples, the powder deposition actuator 282 includes or takes the form of a linear actuator, a robotic actuator arm (e.g., a six-axis robotic actuator arm), or the like.

[0045] In one or more examples, the powder bonding apparatus 212 is movable relative to the build platform 262. In one or more examples, the powder bonding apparatus 212 moves vertically (e.g., rises) relative to the build platform 262 as successive layers of the object 100 are formed. In one or more examples, the powder bonding apparatus 212 moves horizontally relative to the build platform 262 as the object layers 134 are formed. In one or more examples, the powder bonding apparatus 212 has multiple degrees of freedom to accommodate multi-axis movement for bonding the build powder 102 anywhere on the build platform 262.

[0046] In one or more examples, the additive manufacturing system 200 includes a powder bonding actuator 284 coupled to the powder bonding apparatus 212 and configured to drive movement of the powder bonding apparatus 212. In one or more examples, the powder bonding actuator 284 includes or takes the form of a linear actuator, a robotic actuator arm (e.g., a six-axis robotic actuator arm), or the like.

[0047] 2-5 , in one or more examples, the additive manufacturing system 200 includes a controller 250. The controller 250 is in communication with the operating components of the additive manufacturing system 200 via one or more communication lines, such as wired and / or wireless communication. In one or more examples, the controller 250 is configured to generate command signals to control the operation of the powder deposition apparatus 202 and the powder bonding apparatus 212. For example, the controller 250 selectively controls the operation of the powder deposition apparatus 202 and the powder bonding apparatus 212 according to a predetermined plan (e.g., a G-code) stored in the controller 250 to sequentially deposit and bond the build powder 102.

[0048] In one or more examples, the controller 250 is configured to selectively control the movement of the powder deposition device 202 according to a build powder deposition pattern stored in the controller 250 to selectively deposit the build powder 102 at a first location inside the build outline 112 and selectively deposit the support powder 104 at a second location outside the build outline 112. In one or more examples, the controller 250 is also configured to selectively adjust the composition ratio of several build powder components that form the build powder 102 that is distributed at different locations along the build powder deposition pattern.

[0049] In one or more examples, the additive manufacturing system 200 includes a power supply 310. The power supply 310 is configured to provide power to the components of the additive manufacturing system 200 as needed. In one or more examples, the power supply 310 may be a single power supply or may include multiple power supplies operating together to provide the required power output. Alternatively, the multiple power supplies may operate independently and individually power specific components of the additive manufacturing system 200. The power supply 310 may be either an AC or DC power supply, or may utilize a combination of AC and DC.

[0050] In one or more examples, the controller 250 is configured to generate command signals to control the operation of the powder deposition apparatus 202 and the powder bonding apparatus 212. As shown in FIGS. 2 and 7-9 , under direction from the controller 250, the powder deposition apparatus 202 traverses over the build platform 262 dispensing build powder 102 and support powder 104 to form the powder layer 106 according to a three-dimensional computer model of the object 100 stored in the memory of the controller 250. As shown in FIGS. 3 , 10 and 11 , after the powder layer 106 is deposited on the build platform 262, the powder bonding apparatus 212 is actuated and, under direction from the controller 250, traverses over the build platform 262 to bond selected areas of the build powder 102 to form the object layer 134 on the build platform 262. After the object layer 134 is formed, the support powder 104 remains packed around the object layer 134.

[0051] In one or more examples, under direction from the controller 250, the build platform 262 is indexed by one layer thickness. As shown in Figures 4 and 12, under direction from the controller 250, the powder deposition device 202 traverses over the build platform 262 dispensing build powder 102 and support powder 104 to form the second powder layer 126 according to a 3D computer model of the object 100 stored in the memory of the controller 250. As shown in Figure 13, after the second powder layer 126 is deposited on the build platform 262, the powder bonding device 212 is actuated and, under direction from the controller 250, traverses over the build platform 262 to bond selected areas of the build powder 102 to form the second object layer 148 on the build platform 262 and attach the second object layer 148 to the previously formed underlying object layer 134. After the second object layer 148 is formed, the support powder 104 remains packed around the object layer 134 and the second object layer 148. This process is repeated under direction from the controller 250 until the object 100 is complete, as shown in FIG.

[0052] 1 , in one or more examples, according to the method 1000, selectively depositing the build powder 102 (block 1002) includes selectively discharging the build powder 102 using a powder sprayer 204. Thus, as shown in FIGS. 2-5 , in one or more examples, the powder deposition apparatus 202 includes the powder sprayer 204. The powder sprayer 204 is configured to selectively deposit the build powder 102 to form the build powder section 108 of the powder layer 106.

[0053] In one or more examples, the powder deposition actuator 282 is coupled to the powder sprayer 204 and configured to drive the movement of the powder sprayer 204 relative to the build platform 262. In one or more examples, the position and movement of the powder sprayer 204 relative to the build platform 262 is controlled via the powder deposition actuator 282 under direction from the controller 250. In one or more examples, the powder deposition actuator 282 moves the powder sprayer 204 to each of the first locations on the build platform 262 for the deposition of the build powder 102.

[0054] 14 , in one or more examples, the powder sprayer 204 includes a build powder feeder 222 and a nozzle 208. The nozzle 208 is in volumetric communication with the build powder feeder 222 such that the build powder 102 is transferred from the build powder feeder 222 to the nozzle 208. In one or more examples, the nozzle 208 is coupled to the build powder feeder 222 via a supply line 264, such as a conduit, tube, or the like.

[0055] In one or more examples, the build powder feeder 222 is gravity fed such that the build powder 102 is dispensed by gravity. In one or more examples, the build powder feeder 222 is power fed such that the build powder 102 is dispensed by propellant force or actuator force.

[0056] The build powder feeder 222 is configured to hold the build powder 102 and selectively dispense the build powder 102 to the nozzle 208. In one or more examples, the build powder feeder 222 includes a build powder hopper 268 and a build powder regulator 270. The build powder hopper 268 includes any suitable structure configured to store and dispense the build powder 102. The build powder regulator 270 is configured to selectively dispense the build powder 102 from the build powder hopper 268 to the nozzle 208, for example, via the feed line 264.

[0057] The build powder regulator 270 includes any type of regulator suitable for selectively controlling the flow of build powder 102 dispensed from the build powder hopper 268. In one or more examples, the build powder regulator 270 is configured to selectively control the amount of build powder 102 dispensed from the build powder hopper 268. As such, the build powder regulator 270 can supply build powder 102 to the nozzle 208 based on system requirements.

[0058] In one or more examples, the build powder regulator 270 includes a build powder valve 274. The build powder valve 274 is configured to regulate the flow of the build powder 102 from the build powder hopper 268. The build powder valve 274 is configured to selectively open or selectively close. In one or more examples, the build powder valve 274 is a butterfly valve.

[0059] In one or more examples, the build powder regulator 270 includes a build powder mass sensor 276. The build powder mass sensor 276 is configured to measure the mass of the build powder 102 passing through the build powder regulator 270. In one or more examples, the build powder mass sensor 276 provides an in-line measurement so that the amount of build powder 102 passing through the build powder valve 274 can be accurately measured.

[0060] In one or more examples, the amount of build powder 102 passing through the build powder regulator 270 may be adjusted as needed. In one or more examples, control of the build powder regulator 270 is performed manually. In one or more examples, control of the build powder regulator 270 is performed automatically, such as via a control signal received from the controller 250 (FIGS. 2-5).

[0061] In one or more examples, the build powder regulator 270 is actively controlled under direction from the controller 250 to selectively dispense a predetermined amount of the build powder 102 according to a predetermined schedule stored in the controller 250. In one or more examples, the build powder valve 274 is an electronic valve in communication with and controlled by the controller 250. In one or more examples, the build powder mass sensor 276 is in communication with the controller 250.

[0062] The amount of build powder 102 dispensed from the build powder feeder 222 is determined based on several known parameters and values. In one or more examples, the amount of build powder 102 dispensed from the build powder feeder 222 is based on the volume of build powder 102 required to form the build powder section 108 of the powder layer 106 and the density of the build powder 102.

[0063] In one or more examples, the amount of build powder 102 dispensed from the build powder feeder 222 is based on the selected area covered by the build powder 102 (e.g., at a selected one of the first locations), the layer thickness (T) of the powder layer 106, the average particle size of the build powder 102, and the average particle density of the build powder 102. From these parameters, the mass of build powder 102 required to form the build powder section 108 or a selected portion of the build powder section 108 at a given one of the first locations can be determined. Once a predetermined mass of build powder 102 has been dispensed from the build powder hopper 268, as measured by the build powder mass sensor 276, the build powder valve 274 is selectively closed under direction from the controller 250.

[0064] In one or more examples, the powder sprayer 204 includes an exhaust regulator 286. The exhaust regulator 286 is configured to selectively deliver the build powder 102 to or through the nozzle 208. In one or more examples, the exhaust regulator 286 is configured to selectively control the rate at which the build powder 102 is delivered through the nozzle 208. Thus, the exhaust regulator 286 can deliver the build powder 102 through the nozzle 208 based on system requirements.

[0065] In one or more examples, the discharge regulator 286 includes a discharge valve 288. The discharge valve 288 is configured to regulate the flow of build powder 102 to or through the nozzle 208. The discharge valve 288 is configured to be selectively open, selectively closed, or selectively partially open. In one or more examples, the discharge valve 288 is a butterfly valve. In one or more examples, the discharge valve 288 is integrated into the nozzle 208.

[0066] In one or more examples, the exhaust regulator 286 includes a mass flow sensor 278. The mass flow sensor 278 is configured to measure the mass flow rate of the build powder 102 passing through the exhaust regulator 286. In one or more examples, the mass flow sensor 278 provides an in-line measurement so that the flow rate of the build powder 102 passing through the exhaust valve 288 can be accurately measured.

[0067] In one or more examples, the flow rate of the build powder 102 can be adjusted as needed. In one or more examples, control of the exhaust regulator 286 is performed manually. In one or more examples, control of the exhaust regulator 286 is performed automatically, such as via a control signal received from a controller 250 (FIGS. 2-5).

[0068] In one or more examples, the discharge regulator 286 is actively controlled by the controller 250 to selectively dispense the build powder 102 at a predetermined flow rate according to a predetermined schedule stored in the controller 250. In one or more examples, the discharge valve 288 is an electronic valve in communication with and controlled by the controller 250. In one or more examples, the mass flow sensor 278 is in communication with the controller 250.

[0069] The flow rate of the build powder 102 delivered through, and thus expelled from, the nozzle 208 is determined based on several known parameters and values. In one or more examples, the flow rate of the build powder 102 expelled from the nozzle 208 is based on the volume of build powder 102 required to form the build powder section 108 of the powder layer 106, the density of the build powder 102, the size of the nozzle 208, and the duration.

[0070] In one or more examples, the flow rate of the build powder 102 discharged from the nozzle 208 is based on the selected area covered by the build powder 102 (e.g., at a selected one of the first locations), the layer thickness (T) of the powder layer 106, the average particle size of the build powder 102, the average particle density of the build powder 102, the volume of the exit orifice of the nozzle 208, and the time required to form the build powder section 108. From these parameters, the mass flow rate of the build powder 102 required to form the build powder section 108 or a selected portion of the build powder section 108 at a given one of the first locations can be determined. During the discharge of the build powder 102 from the nozzle 208, the controller 250 monitors the mass flow rate of the build powder 102, as measured by the mass flow sensor 278. If the measured mass flow rate of the build powder 102 deviates from the predetermined mass flow rate of the build powder 102, the discharge valve 288 is selectively partially opened or selectively partially closed under direction from the controller 250, for example, to adjust the volume of the outlet orifice of the nozzle 208 so that the measured mass flow rate of the build powder 102 and the predetermined mass flow rate of the build powder 102 are equal or within an acceptable range.

[0071] In one or more examples, the nozzle 208 is configured to selectively eject build powder 102 and direct the build powder 102 toward the build platform 262. In one or more examples, the position and movement of the nozzle 208 relative to the build platform 262 is controlled via a powder deposition actuator 282 ( FIGS. 2-5 ) under direction from the controller 250. In one or more examples, the powder deposition actuator 282 moves the nozzle 208 to each of the first locations on the build platform 262 and to a selected (e.g., desired) distance between the nozzle 208 and the build platform 262 for ejection of the build powder 102. In one or more examples, the nozzle 208 is maintained at the selected distance for a predetermined time under direction from the controller 250 at the selected one of the first locations to eject the build powder 102 to form the build powder section 108 of the powder layer 106 or a selected portion of the build powder section 108 at the selected one of the first locations.

[0072] 1 , in one or more examples, according to method 1000, selectively depositing support powder 104 (block 1004) includes selectively discharging support powder 104 using a powder sprayer 204. Thus, as shown in FIGS. 2-5 , in one or more examples, the powder sprayer 204 is configured to selectively deposit support powder 104 to form support powder sections 110 of the powder layer 106. In one or more examples, the powder deposition actuator 282 moves the powder sprayer 204 to each of the second locations on the build platform 262 for discharging the support powder 104.

[0073] 15 , in one or more examples, the powder sprayer 204 includes a support powder feeder 224. In one or more examples, the nozzle 208 is in volumetric communication with the support powder feeder 224 such that the support powder 104 is transferred from the support powder feeder 224 to the nozzle 208. In one or more examples, the nozzle 208 is coupled to the support powder feeder 224 via a feed line 264 and configured to selectively discharge the support powder 104.

[0074] In one or more examples, the support powder feeder 224 is gravity fed such that the support powder 104 is dispensed by gravity. In one or more examples, the support powder feeder 224 is power fed such that the support powder 104 is dispensed by propellant force or actuator force.

[0075] The support powder feeder 224 is configured to hold the support powder 104 and selectively dispense the support powder 104 to the nozzle 208. In one or more examples, the support powder feeder 224 includes a support powder hopper 296 and a support powder regulator 298. The support powder hopper 296 includes any suitable structure configured to store and dispense the support powder 104. The support powder regulator 298 is configured to selectively dispense the support powder 104 from the support powder hopper 296 to the nozzle 208, for example, via the feed line 264.

[0076] The support powder regulator 298 includes any type of regulator suitable for selectively controlling the flow of support powder 104 dispensed from the support powder hopper 296. In one or more examples, the support powder regulator 298 is configured to selectively control the amount of support powder 104 dispensed from the support powder hopper 296. As such, the support powder regulator 298 can provide support powder 104 to the nozzle 208 based on system requirements.

[0077] In one or more examples, the support powder regulator 298 includes a support powder valve 300. The support powder valve 300 is configured to regulate the flow of the support powder 104 from the support powder hopper 296. The support powder valve 300 is configured to selectively open or selectively close. In one or more examples, the support powder valve 300 is a butterfly valve.

[0078] In one or more examples, the support powder regulator 298 includes a support powder mass sensor 302. The support powder mass sensor 302 is configured to measure the mass of the support powder 104 passing through the support powder regulator 298. In one or more examples, the support powder mass sensor 302 provides an in-line measurement so that the amount of support powder 104 passing through the support powder valve 300 can be accurately measured.

[0079] In one or more examples, the amount of support powder 104 passing through the support powder regulator 298 can be adjusted as needed. In one or more examples, control of the support powder regulator 298 is performed manually. In one or more examples, control of the support powder regulator 298 is performed automatically, such as via a control signal received from a controller 250 (FIGS. 2-5).

[0080] In one or more examples, the support powder regulator 298 is actively controlled under direction from the controller 250 to selectively dispense a predetermined amount of support powder 104 according to a predetermined schedule stored in the controller 250. In one or more examples, the support powder valve 300 is an electronic valve in communication with and controlled by the controller 250. In one or more examples, the support powder mass sensor 302 is in communication with the controller 250.

[0081] The amount of support powder 104 dispensed from the support powder feeder 224 is determined based on several known parameters and values. In one or more examples, the amount of support powder 104 dispensed from the support powder feeder 224 is based on the volume of support powder 104 needed to form the support powder section 110 of the powder layer 106 and the density of the support powder 104.

[0082] In one or more examples, the amount of support powder 104 dispensed from support powder feeder 224 is based on the selected area covered by support powder 104 (e.g., at a selected one of the second locations), the layer thickness (T) of powder layer 106, the average particle size of support powder 104, and the average particle density of support powder 104. From these parameters, the mass of support powder 104 needed to form support powder section 110 or a selected portion of support powder section 110 at a given one of the second locations can be determined. Once a predetermined mass of support powder 104 has been dispensed from support powder hopper 296, as measured by support powder mass sensor 302, support powder valve 300 is selectively closed under direction from controller 250.

[0083] In one or more examples, the discharge regulator 286 is configured to selectively deliver the support powder 104 to or through the nozzle 208. In one or more examples, the discharge regulator 286 is configured to selectively control the rate at which the support powder 104 is delivered through the nozzle 208. Thus, the discharge regulator 286 can deliver the support powder 104 through the nozzle 208 based on system requirements.

[0084] In one or more examples, the discharge valve 288 is configured to regulate the flow of support powder 104 to or through the nozzle 208. In one or more examples, the mass flow sensor 278 is configured to measure the mass flow rate of the support powder 104 passing through the discharge regulator 286. In one or more examples, the mass flow sensor 278 provides an in-line measurement such that the flow rate of the support powder 104 passing through the discharge valve 288 can be accurately measured. In one or more examples, the flow rate of the support powder 104 can be adjusted as needed.

[0085] In one or more examples, the discharge regulator 286 is actively controlled by the controller 250 to selectively dispense the support powder 104 at a predetermined flow rate according to a predetermined schedule stored in the controller 250. The flow rate of the support powder 104 delivered through, and therefore discharged from, the nozzle 208 is determined based on several known parameters and values. In one or more examples, the flow rate of the support powder 104 discharged from the nozzle 208 is based on the volume of support powder 104 required to form the support powder section 110 of the powder layer 106, the density of the support powder 104, the size of the nozzle 208, and the duration.

[0086] In one or more examples, the flow rate of the support powder 104 discharged from the nozzle 208 is based on the selected area covered by the support powder 104 (e.g., at the selected one of the second locations), the layer thickness (T) of the powder layer 106, the average particle size of the support powder 104, the average particle density of the support powder 104, the volume of the exit orifice of the nozzle 208, and the time required to form the support powder section 110. From these parameters, the mass flow rate of the support powder 104 required to form the support powder section 110 or a selected portion of the support powder section 110 at a given one of the second locations can be determined. During the discharge of the support powder 104 from the nozzle 208, the controller 250 monitors the mass flow rate of the support powder 104, as measured by the mass flow sensor 278. If the measured mass flow rate of the support powder 104 deviates from the predetermined mass flow rate of the support powder 104, the discharge valve 288 is selectively partially opened or selectively partially closed under direction from the controller 250 to adjust, for example, the volume of the outlet orifice of the nozzle 208 so that the measured mass flow rate of the support powder 104 and the predetermined mass flow rate of the support powder 104 are equal or within a predetermined tolerance range.

[0087] In one or more examples, the nozzle 208 is configured to selectively eject the support powder 104 and direct the support powder 104 toward the build platform 262. In one or more examples, the position and movement of the nozzle 208 relative to the build platform 262 is controlled via a powder deposition actuator 282 ( FIGS. 2-5 ) under direction from the controller 250. In one or more examples, the powder deposition actuator 282 moves the nozzle 208 to each of the second locations on the build platform 262 and to a selected (e.g., desired) distance between the nozzle 208 and the build platform 262 for ejection of the support powder 104. In one or more examples, the nozzle 208 is maintained at the selected distance for a predetermined time under direction from the controller 250 at the selected one of the second locations to eject the support powder 104 to form the support powder section 110 of the powder layer 106 or a selected portion of the support powder section 110 at the selected one of the second locations.

[0088] The nozzle 208 may be any suitable powder delivery nozzle configured to eject a solid powder material. In one or more examples, the nozzle 208 is a single orifice nozzle. The nozzle 208 is configured to provide accurate and precise placement of the build powder 102 at a first location inside the build shape 112. In one or more examples, the nozzle 208 is configured to provide accurate and precise placement of the support powder 104 at a second location outside the build shape 112.

[0089] The build powder 102 is discharged from the nozzle 208 at an appropriate velocity to allow for accurate and precise placement of the build powder 102 to form the build powder section 108 of the powder layer 106. The support powder 104 is discharged from the nozzle 208 at an appropriate velocity to allow for accurate and precise placement of the support powder 104 to form the support powder section 110 of the powder layer 106. In one or more examples, the nozzle 208 is gravity fed such that the build powder 102 or support powder 104 is discharged from the nozzle 208 by gravity. In one or more examples, the nozzle 208 is power fed such that the build powder 102 or support powder 104 is discharged from the nozzle 208 by propellant force or actuator force.

[0090] In one or more examples, the powder atomizer 204 includes a tank 290. The tank 290 includes any suitable structure configured to hold a gas propellant 294. The gas propellant 294 is a pressurized gas used as a propellant via a supply line 264 to eject the build powder 102 or the support powder 104 from the nozzle 208. In one or more examples, the powder atomizer 204 includes a propellant regulator 292. The propellant regulator 292 is configured to supply the gas propellant 294 from the tank 290 via the supply line 264 to the nozzle 208.

[0091] The propulsion regulator 292 may include any pressure or flow regulator that controls the output pressure or flow of a fluid to a desired value. As an example, the propulsion regulator 292 may include a valve. In one or more examples, the output pressure or flow of the propulsion regulator 292 may be adjusted based on a command signal received from the controller 250.

[0092] In one or more examples, the gas propellant 294 is any gas propellant suitable for propelling solid powder materials (e.g., the build powder 102 and the support powder 104). By way of example, the gas propellant is an inert gas propellant. By selecting the gas propellant as an inert gas propellant, chemical reactions between the powder materials and the gas propellant can be minimized or avoided. By way of example, the gas propellant is at least one of argon, helium, and nitrogen.

[0093] In the illustrative example, the powder sprayer 204 uses one nozzle (e.g., nozzle 208) and one regulator (e.g., discharge regulator 286) that is associated with and shared by both the build powder feeder 222 and the support powder feeder 224 for selectively depositing the build powder 102 and the support powder 104. However, in other examples, the powder sprayer 204 may include multiple nozzles and / or multiple regulators, with each nozzle and regulator associated with or dedicated to one of the build powder feeder 222 or the support powder feeder 224 for selectively depositing the build powder 102 and the support powder 104.

[0094] Thus, use of the powder sprayer 204 provides accurate and precise placement of the build powder 102 at a first location to form the build powder section 108 of the powder layer 106 and the support powder 104 at a second location to form the support powder section 110 of the powder layer 106 with a uniform result. In one or more examples, such placement eliminates the need for a secondary step of spreading or distributing the build powder 102 or support powder 104 throughout the build platform 262, such as by a powder spreading device (e.g., a wiper or roller), thereby improving processing efficiency.

[0095] 1 , in one or more examples, selectively depositing the support powder 104 (block 1004) according to the method 1000 includes selectively discharging the support powder 104 using a recoater 206. Thus, as shown in FIGS. 2-5 , in one or more examples, the powder deposition apparatus 202 includes the recoater 206. The recoater 206 is configured to selectively deposit the support powder 104 to form the support powder section 110 of the powder layer 106.

[0096] The recoater 206 can selectively deposit the support powder 104 at a second location outside the build shape 112 at a faster deposition rate compared to the powder sprayer 204. Therefore, using the recoater 206 to deposit the support powder 104 reduces the processing time per layer. Increasing the deposition rate of the support powder 104 is particularly advantageous for applications where a majority of each powder layer is formed by the support powder 104.

[0097] In one or more examples, the step of selectively depositing the support powder 104 (block 1004) includes selectively discharging the support powder 104 using a recoater 206 to form a first portion of the support powder section 110 of the powder layer 106, and selectively discharging the support powder 104 using a powder sprayer 204 to form a second portion of the support powder section 110 of the powder layer 106. For example, the recoater 206 can deposit the support powder 104 in a relatively large area away from the build shape 112, and the powder sprayer 204 can deposit the support powder 104 in a relatively small area closer to the build shape 112 where finer control of the powder deposition is beneficial.

[0098] In one or more examples, the powder deposition actuator 282 is coupled to the recoater 206 and configured to drive movement of the recoater 206 relative to the build platform 262. The position and movement of the recoater 206 relative to the build platform 262 is controlled via the powder deposition actuator 282 under direction from the controller 250. In one or more examples, the powder deposition actuator 282 moves the recoater 206 linearly across the build platform 262 to eject the support powder 104 at each of the second locations on the build platform 262.

[0099] 16 , in one or more examples, the recoater 206 includes a support powder feeder 224 and a roller 210. The support powder feeder 224 is configured to selectively dispense support powder 104 to the roller 210. In one or more examples, the flow of support powder 104 from the support powder feeder 224 to the roller 210 is controlled by a support powder regulator 298 in a manner similar to that described above.

[0100] The roller 210 is configured to collect the support powder 104 from the support powder feeder 224 and selectively discharge the support powder 104 at a second location outside the build outline 112 on the build platform 262 to form the support powder section 110 of the powder layer 106. In one or more examples, the roller 210 has a cylindrical surface 306 and is configured to rotate about a cylindrical axis while discharging the support powder 104.

[0101] In one or more examples, the support powder 104 is selectively maintained on the surface 306 of the roller 210 using an adhesive distributed on the surface 306. The support powder 104 is selectively detached from the surface 306 by releasing the adhesive. The detached particles of the support powder 104 are selectively deposited on the build platform 262 at a second location outside the build outline 112 as the roller 210 traverses the build platform 262 to form the support powder section 110 of the powder layer 106.

[0102] In one or more examples, the recoater 206 includes an adhesive mechanism 304. In one or more examples, the adhesive mechanism 304 is disposed within or is part of the roller 210. The adhesive mechanism 304 is configured, under direction from the controller 250, to generate an adhesive force having a component perpendicular to the surface 306. The support powder feeder 224 deposits the support powder 104 onto the surface 306 of the roller 210. The adhesive force acts radially inward to hold the support powder 104 on the surface 306.

[0103] In one or more examples, the adhesive mechanism 304 is also configured to selectively release or unbind the adhesive force under direction from the controller 250 so that the support powder 104 separates from the surface 306. Alternatively, or in addition, in one or more examples, the recoater 206 includes a release mechanism 308. In one or more examples, the release mechanism 308 is disposed within or is part of the roller 210. The release mechanism 308 is configured to generate a release force that has a component perpendicular to the surface 306 and that acts radially outward under direction from the controller 250. The release force overcomes and locally breaks the adhesive force between the surface 306 and the support powder 104, selectively separating the support powder 104 from the surface 306.

[0104] In one or more examples, the adhesion mechanism 304 is configured to selectively adhere the support powder 104 to a selected portion of the surface 306 of the roller 210 as the support powder 104 is deposited on the surface 306 under direction from the controller 250. The selected portion of the surface 306 corresponds to one of the second locations on the build platform 262 traversed by the roller 210. Thus, as the roller 210 traverses the build platform 262, the entirety of the support powder 104 located on the surface 306 is separated from the surface 306 by at least one of removing an adhesion force or generating a release force.

[0105] Alternatively, in one or more examples, the adhesion mechanism 304 is configured to adhere the support powder 104 to the entire surface 306 of the roller as the support powder 104 is deposited on the surface 306. The adhesion mechanism 304 and / or the release mechanism 308 are configured to selectively detach the support powder 104 from selected portions of the surface 306 that correspond to one of the second locations on the build platform 262 as the roller 210 traverses the build platform 262. Thus, the selected portions of the support powder 104 located on the surface 306 are detached from the surface 306 by at least one of removing an adhesion force or generating a release force as the roller 210 traverses the build platform 262.

[0106] In one or more examples, the adhesive forces selectively activated and optionally deactivated by the adhesion mechanism 304 to adhere the support powder 104 to the surface 306 of the roller 210 are at least one of magnetic forces, electrostatic forces, van der Waals forces, negative pressure from a vacuum, positive pressure from a gas flow, etc. Similarly, these same forces can be selectively activated and deactivated by the release mechanism 308 to use the releasing forces to separate the support powder 104 from the surface 306 of the roller 210. As expressed above, these forces can be localized and correspond only to certain portions of the surface 306 of the roller 210, or can be distributed and correspond to the entire surface 306 of the roller 210.

[0107] 1 , in one or more examples, the method 1000 includes selectively controlling (block 1008) a build powder composition of the build powder 102. Thus, in one or more examples, the powder sprayer 204 is configured to selectively control the build powder composition of the build powder 102.

[0108] In one or more examples, according to the method 1000, the steps of selectively controlling the build powder composition of the build powder 102 (block 1008) and selectively depositing the build powder 102 (block 1002) are performed simultaneously. For example, the build powder feeder 222 is configured, under direction from the controller 250, to selectively control the build powder composition of the build powder 102 dispensed to the nozzle 208 while the build powder 102 is being discharged from the nozzle 208. Thus, the build powder composition of the build powder 102 can be controlled in real time as the powder sprayer 204 moves relative to the build platform 262 to deposit the build powder 102 at a first location inside the build outline 112 to form the build powder section 108 of the powder layer 106. This real-time control of the build powder composition of the build powder 102 increases process efficiency and reduces cycle time.

[0109] The present disclosure recognizes that there are advantages to providing an object having a compositional gradient in one or more axial directions. The present disclosure also recognizes that forming an object having a compositional gradient using conventional manufacturing techniques can be difficult. One or more example additive manufacturing systems 200 and methods 1000 provide techniques for selectively depositing a powder gradient in one or more powder layers, resulting in an object 100 having a compositional gradient that can be tailored based on desired physical, chemical, electrical, thermal, and / or magnetic properties within the object 100.

[0110] 1 , in one or more examples, selectively controlling the build powder composition of the build powder 102 (block 1008) includes selectively varying the build powder composition of the build powder 102 to achieve a powder gradient 152 ( FIG. 17 ) within the build powder section 108 of the powder layer 106. In one or more examples, the build powder 102 includes a mixture of a first build powder component 122 and a second build powder component 124 ( FIG. 18 ). According to the method 1000, selectively controlling the build powder composition of the build powder 102 (block 1008) includes selectively controlling the composition ratio of the first build powder component 122 and the second build powder component 124 within the build powder section 108 of the powder layer 106.

[0111] 17 shows an example composition ratio of the percentage of the first build powder component 122 and the percentage of the second build powder component 124 of the build powder 102 forming a powder gradient 152 in the build powder section 108 of the example powder layer 106. In the illustrative example of the powder gradient 152, a first portion of the build powder section 108 of the powder layer 106 includes build powder 102 having a first build powder composition, e.g., including 100% of the second build powder component 124 and 0% of the first build powder component 122. A second portion of the build powder section 108 includes build powder 102 having a second build powder composition, e.g., including 0% of the second build powder component 124 and 100% of the first build powder component 122. The gradient portion of the build powder section 108 between the first and second sections forms a compositional gradient zone that uniaxially transitions between the first and second build powder compositions.

[0112] The distribution of the first build powder component 122 and the second build powder component 124 is not limited to the illustrated example. In other examples, the powder gradient 152 can have any other compositional distribution in one or more axial directions. Thus, the object layer 134 formed by joining the build powders 102 of the build powder section 108 of the powder layer 106 having the powder gradient 152 includes a compositional gradient in one or more axial directions corresponding to the powder gradient 152. Furthermore, in various examples, the powder gradient 152 is formed by the percentage composition ratio of any number (e.g., two or more) of the build powder components.

[0113] The illustrative example shows one powder layer of multiple successive powder layers that are joined to form the multiple object layers of object 100. In one or more examples, the powder gradient 152 of each of the multiple powder layers is the same, such that the composition of object 100 is substantially the same throughout its thickness. In these examples, object 100 may have a composition gradient along the X-axis and / or Y-axis. In one or more examples, the powder gradient 152 of one or more of the multiple powder layers is different, such that the composition of object 100 varies throughout its thickness. In these examples, object 100 may have a composition gradient along the X-axis and / or Y-axis as well as the Z-axis.

[0114] In one or more examples, each build powder section 108 of a powder layer is composed of only one build powder component, but the build powder component varies between successive powder layers. In these examples, the object 100 may have a composition gradient along the Z-axis.

[0115] 18 , in one or more examples, the powder sprayer 204 is configured to selectively vary the build powder composition of the build powder 102 to achieve a powder gradient 152 within the build powder section 108 of the powder layer 106. In one or more examples, the build powder feeder 222 includes a build powder first component feeder 226 and a build powder second component feeder 228. The build powder first component feeder 226 is configured to selectively dispense the build powder first component 122. The build powder second component feeder 228 is configured to selectively dispense the build powder second component 124.

[0116] The build powder feeder 222 also includes a mixer 230. The mixer 230 is in volumetric communication with a first build powder component feeder 226 and a second build powder component feeder 228 such that the first build powder component 122 and the second build powder component 124 are transferred to the mixer 230. In one or more examples, the mixer 230 is coupled to the first build powder component feeder 226 and the second build powder component feeder 228 via a supply line 264. The mixer 230 is configured to mix the first build powder component 122 and the second build powder component 124 together to form a build powder 102 having a predetermined build powder composition. The mixer 230 also includes the build powder 102 and is configured to selectively distribute the build powder 102 to the nozzles 208.

[0117] In one or more examples, according to the method 1000, selectively controlling the composition ratio of the first build powder component 122 and the second build powder component 124 (block 1008) includes selectively dispensing a first mass of the first build powder component 122 and selectively dispensing a second mass of the second build powder component 124. Selectively dispensing predetermined masses of each of the first build powder component 122 and the second build powder component 124 provides a build powder 102 having a predetermined (e.g., desired) build powder composition.

[0118] In one or more examples, the first build powder component feeder 226 and the second build powder component feeder 228 are gravity fed such that the first build powder component 122 and the second build powder component 124 are dispensed by gravity. In one or more examples, the first build powder component feeder 226 and the second build powder component feeder 228 are power fed such that the first build powder component 122 and the second build powder component 124 are dispensed by propellant force or actuator force.

[0119] The build powder first component feeder 226 is configured to hold the build powder first component 122 and selectively dispense the build powder first component 122 to the mixer 230. In one or more examples, the build powder first component feeder 226 includes a build powder first component hopper 312 and a build powder first component regulator 232. The build powder first component hopper 312 includes any suitable structure configured to store and dispense the build powder first component 122. The build powder first component regulator 232 is configured to selectively dispense the build powder first component 122 from the build powder first component hopper 312 to the mixer 230, for example, via a feed line 264.

[0120] The build powder first component regulator 232 comprises any type of regulator suitable for selectively controlling the flow of the build powder first component 122 dispensed from the build powder first component hopper 312. In one or more examples, the build powder first component regulator 232 is configured to selectively control the amount of the build powder first component 122 dispensed from the build powder first component hopper 312. Thus, the build powder first component regulator 232 can provide the build powder first component 122 to the mixer 230 based on system requirements.

[0121] In one or more examples, the build powder first component regulator 232 includes a build powder first component valve 236. The build powder first component valve 236 is configured to regulate the flow of the build powder first component 122 from the build powder first component hopper 312. The build powder first component valve 236 is configured to be selectively open or selectively closed. In one or more examples, the build powder first component valve 236 is a butterfly valve.

[0122] In one or more examples, the build powder first component regulator 232 includes a build powder first component mass sensor 238. The build powder first component mass sensor 238 is configured to measure a first mass of the build powder first component 122 passing through the build powder first component regulator 232. In one or more examples, the build powder first component mass sensor 238 provides an in-line measurement so that the amount of the build powder first component 122 passing through the build powder first component valve 236 can be accurately measured.

[0123] In one or more examples, the amount of build powder first component 122 passing through the build powder first component regulator 232 can be adjusted as needed. In one or more examples, control of the build powder first component regulator 232 is performed manually. In one or more examples, control of the build powder first component regulator 232 is performed automatically, such as via a control signal received from a controller 250 (FIGS. 2-5).

[0124] In one or more examples, the build powder first component regulator 232 is actively controlled under direction from the controller 250 to selectively dispense a predetermined amount of the build powder first component 122 according to a predetermined schedule stored in the controller 250. In one or more examples, the build powder first component valve 236 is an electronic valve in communication with and controlled by the controller 250. In one or more examples, the build powder first component mass sensor 238 is in communication with the controller 250.

[0125] The amount of the first build powder component 122 dispensed from the first build powder component feeder 226 is determined based on several known parameters and values. In one or more examples, the amount of the first build powder component 122 dispensed from the first build powder component feeder 226 is based on the volume of the first build powder component 122 required to form the build powder section 108 of the powder layer 106 and the density of the first build powder component 122.

[0126] In one or more examples, the amount of build powder first component 122 dispensed from build powder first component feeder 226 is based on the selected area covered by build powder 102 (e.g., at a selected one of the first locations), the layer thickness (T) of powder layer 106, the average particle size of build powder first component 122, the average particle density of build powder first component 122, and the percent composition of build powder 102 with the first build powder component 122. From these parameters, a first mass of build powder first component 122 required to form build powder section 108 or a selected portion of build powder section 108 at a given one of the first locations can be determined. Once a predetermined first mass of build powder first component 122 has been dispensed from build powder first component hopper 312, as measured by build powder first component mass sensor 238, build powder first component valve 236 is selectively closed under direction from controller 250.

[0127] The second build powder component feeder 228 is configured to hold the second build powder component 124 and selectively dispense the second build powder component 124 to the mixer 230. In one or more examples, the second build powder component feeder 228 includes a second build powder component hopper 314 and a second build powder component regulator 234. The second build powder component hopper 314 includes any suitable structure configured to store and dispense the second build powder component 124. The second build powder component regulator 234 is configured to selectively dispense the second build powder component 124 from the second build powder component hopper 314 to the mixer 230, for example, via a feed line 264.

[0128] The second build powder component regulator 234 includes any type of regulator suitable for selectively controlling the flow of the second build powder component 124 dispensed from the second build powder component hopper 314. In one or more examples, the second build powder component regulator 234 is configured to selectively control the amount of the second build powder component 124 dispensed from the second build powder component hopper 314. Thus, the second build powder component regulator 234 can provide the second build powder component 124 to the mixer 230 based on system requirements.

[0129] In one or more examples, the build powder second component regulator 234 includes a build powder second component valve 244. The build powder second component valve 244 is configured to regulate the flow of the build powder second component 124 from the build powder second component hopper 314. The build powder second component valve 244 is configured to be selectively open or selectively closed. In one or more examples, the build powder second component valve 244 is a butterfly valve.

[0130] In one or more examples, the second build powder component regulator 234 includes a second build powder component mass sensor 246. The second build powder component mass sensor 246 is configured to measure a second mass of the second build powder component 124 passing through the second build powder component regulator 234. In one or more examples, the second build powder component mass sensor 246 provides an in-line measurement so that the amount of the second build powder component 124 passing through the second build powder component valve 244 can be accurately measured.

[0131] In one or more examples, the amount of second build powder component 124 passing through the second build powder component regulator 234 can be adjusted as needed. In one or more examples, control of the second build powder component regulator 234 is performed manually. In one or more examples, control of the second build powder component regulator 234 is performed automatically, such as via a control signal received from a controller 250 (FIGS. 2-5).

[0132] In one or more examples, the build powder second component regulator 234 is actively controlled under direction from the controller 250 to selectively dispense a predetermined amount of the build powder second component 124 according to a predetermined schedule stored in the controller 250. In one or more examples, the build powder second component valve 244 is an electronic valve in communication with and controlled by the controller 250. In one or more examples, the build powder second component mass sensor 246 is in communication with the controller 250.

[0133] The amount of second build powder component 124 dispensed from second build powder component feeder 228 is determined based on several known parameters and values. In one or more examples, the amount of second build powder component 124 dispensed from second build powder component feeder 228 is based on the volume of second build powder component 124 needed to form build powder section 108 of powder layer 106 and the density of second build powder component 124.

[0134] In one or more examples, the amount of second build powder component 124 dispensed from second build powder component feeder 228 is based on the selected area covered by build powder 102 (e.g., at a selected one of the first locations), the layer thickness (T) of powder layer 106, the average particle size of second build powder component 124, the average particle density of second build powder component 124, and the percent composition of second build powder component 124 in build powder 102. From these parameters, a second mass of second build powder component 124 required to form build powder section 108 or a selected portion of build powder section 108 at a given one of the first locations can be determined. Once a predetermined second mass of second build powder component 124 has been dispensed from second build powder component hopper 314, as measured by second build powder component mass sensor 246, second build powder component valve 244 is selectively closed under direction from controller 250.

[0135] In one or more examples, selectively controlling the compositional ratio of the first build powder component 122 and the second build powder component 124 (block 1008) also includes monitoring the mass of the build powder 102 formed by the predetermined, selectively controlled compositional ratio of the first build powder component 122 and the second build powder component 124. Monitoring the mass of the build powder 102 formed by the first build powder component 122 and the second build powder component 124 serves as a quality control measure to verify that the actual build powder composition of the build powder 102 is equal to or within an acceptable range of the desired (e.g., predetermined) build powder composition of the build powder 102.

[0136] 18 , in one or more examples, the build powder feeder 222 includes a mixer regulator 316. The mixer regulator 316 is configured to selectively dispense the build powder 102 to the nozzle 208. In one or more examples, the mixer regulator 316 includes a mixer valve 318. The mixer valve 318 is configured to regulate the flow of the build powder 102 to the nozzle 208. The mixer valve 318 is configured to selectively open or selectively close. In one or more examples, the mixer valve 318 is a butterfly valve. In one or more examples, the mixer valve 318 is an electronic valve in communication with and controlled by the controller 250.

[0137] In one or more examples, the mixer regulator 316 includes a mixer mass sensor 320. The mixer mass sensor 320 is configured to measure the mass of the build powder 102 passing through the mixer regulator 316. In one or more examples, the mixer mass sensor 320 provides an in-line measurement so that the mass of the build powder 102 passing through the mixer valve 318 can be accurately measured. In one or more examples, the mixer mass sensor 320 is in communication with the controller 250.

[0138] In one or more examples, the mass of the build powder 102 formed by the first build powder component 122 and the second build powder component 124, as measured by the mixer mass sensor 320, is provided to a controller 250 that monitors the mass of the build powder 102 dispensed from the mixer 230 (FIGS. 2-5). If the measured mass of the build powder 102 having the actual build powder composition deviates from the desired (e.g., predetermined) mass of the build powder 102 having the predetermined build powder composition, a selected one of the first build powder component regulator 232 or the second build powder component regulator 234, under direction from the controller 250, selectively dispenses an additional mass of one of the first build powder component 122 or the second build powder component 124 to adjust the build powder composition of the build powder 102 so that the measured mass of the build powder 102 and the desired mass of the build powder 102 are equal or within an acceptable range.

[0139] In one or more examples, selectively controlling the composition ratio of the first build powder component 122 and the second build powder component 124 (block 1008) also includes selectively controlling a first mass flow rate of the first build powder component 122 and selectively controlling a second mass flow rate of the second build powder component 124. Selectively dispensing each of the first build powder component 122 and the second build powder component 124 at predetermined mass flow rates provides the build powder 102 having a predetermined (e.g., desired) build powder composition and serves as another quality control measure to ensure that the actual build powder composition of the build powder 102 is equal to or within a tolerance range of the desired (e.g., predetermined) build powder composition of the build powder 102.

[0140] 18 , in one or more examples, the build powder first component regulator 232 includes a build powder first component mass flow sensor 240. The build powder first component mass flow sensor 240 is configured to measure the first mass flow rate of the build powder first component 122 passing through the build powder first component regulator 232. In one or more examples, the build powder first component mass flow sensor 240 provides an in-line measurement such that the first mass flow rate of the build powder first component 122 passing through the build powder first component valve 236 can be accurately measured.

[0141] The first mass flow rate of the first build powder component 122 delivered through the build powder first component regulator 232, and therefore dispensed from the build powder first component feeder 226, is determined based on several known parameters and values. In one or more examples, the first mass flow rate of the first build powder component 122 dispensed from the build powder first component feeder 226 is based on the first mass of the first build powder component 122, the volume of the first build powder component 122 required to form the build powder section 108 of the powder layer 106, the density of the first build powder component 122, the size and duration of the build powder first component valve 236.

[0142] In one or more examples, the first mass flow rate of the first build powder component 122 dispensed from the first build powder component feeder 226 is based on the first mass of the first build powder component 122 required for the desired build powder composition of the build powder 102, the selected area (e.g., at the selected one of the first locations) covered by the build powder 102, the layer thickness (T) of the powder layer 106, the average particle size of the first build powder component 122, the average particle density of the first build powder component 122, the volume of the exit orifice of the first build powder component valve 236, and the time required to dispense the first mass of the first build powder component 122. From these parameters, the first mass flow rate of the first build powder component 122 required to achieve the desired build powder composition of the build powder 102 and form the build powder section 108, or a selected portion of the build powder section 108, at a given one of the first locations can be determined. During the discharge of the first build powder component 122 from the first build powder component regulator 232, the controller 250 monitors the mass flow rate of the first build powder component 122, as measured by the first build powder component mass flow sensor 240. If the measured mass flow rate of the first build powder component 122 deviates from the predetermined mass flow rate of the first build powder component 122, the first build powder component valve 236 is selectively partially opened or selectively partially closed under direction from the controller 250, for example, to adjust the volume of the outlet orifice of the first build powder component valve 236 so that the measured mass flow rate of the first build powder component 122 and the predetermined mass flow rate of the first build powder component 122 are equal to or within an acceptable range.

[0143] In one or more examples, the build powder second component regulator 234 includes a build powder second component mass flow sensor 248. The build powder second component mass flow sensor 248 is configured to measure the second mass flow rate of the build powder first component 122 passing through the build powder second component regulator 234. In one or more examples, the build powder second component mass flow sensor 248 provides an in-line measurement such that the second mass flow rate of the build powder second component 124 passing through the build powder second component valve 244 can be accurately measured.

[0144] The second mass flow rate of the second build powder component 124 delivered through the second build powder component regulator 234, and therefore dispensed from the second build powder component feeder 228, is determined based on several known parameters and values. In one or more examples, the second mass flow rate of the second build powder component 124 dispensed from the second build powder component feeder 228 is based on the second mass of the second build powder component 124, the volume of the second build powder component 124 required to form the build powder section 108 of the powder layer 106, the density of the second build powder component 124, the size and duration of the second build powder component valve 244.

[0145] In one or more examples, the second mass flow rate of the second build powder component 124 dispensed from the second build powder component feeder 228 is based on the second mass of the second build powder component 124 required for the desired build powder composition of the build powder 102, the selected area (e.g., at the selected one of the first locations) covered by the build powder 102, the layer thickness (T) of the powder layer 106, the average particle size of the second build powder component 124, the average particle density of the second build powder component 124, the volume of the exit orifice of the second build powder component valve 244, and the time required to dispense the second mass of the second build powder component 124. From these parameters, the second mass flow rate of the second build powder component 124 required to achieve the desired build powder composition of the build powder 102 and form the build powder section 108, or a selected portion of the build powder section 108, at a given one of the first locations can be determined. During discharge of the second build powder component 124 from the second build powder component regulator 234, the controller 250 monitors the mass flow rate of the second build powder component 124, as measured by the second build powder component mass flow sensor 248. If the measured mass flow rate of the second build powder component 124 deviates from the predetermined mass flow rate of the second build powder component 124, the second build powder component valve 244 is selectively partially opened or selectively partially closed under direction from the controller 250, for example, to adjust the volume of the outlet orifice of the second build powder component valve 244 so that the measured mass flow rate of the second build powder component 124 and the predetermined mass flow rate of the second build powder component 124 are equal to or within an acceptable range.

[0146] Thus, the mass flow rates of the first build powder component 122 and the second build powder component 124 can be adjusted as needed. In one or more examples, control of the first build powder component regulator 232 and the second build powder component regulator 234 is performed manually. In one or more examples, control of the first build powder component regulator 232 and the second build powder component regulator 234 is performed automatically, such as via control signals received from a controller 250 (FIGS. 2-5). In one or more examples, the first build powder component regulator 232 and the second build powder component regulator 234 are actively controlled by the controller 250 to selectively dispense the first build powder component 122 and the second build powder component 124 at predetermined mass flow rates according to a predetermined schedule stored in the controller 250. In one or more examples, the first build powder component valve 236 and the second build powder component valve 244 are electronic valves in communication with and controlled by the controller 250. In one or more examples, the build powder first component mass flow sensor 240 and the build powder second component mass flow sensor 248 are in communication with the controller 250 .

[0147] As expressed above, in one or more examples, the discharge regulator 286 is configured to selectively control the rate at which the build powder 102 formed by the mixture of the first build powder component 122 and the second build powder component 124 is delivered through the nozzle 208 to form the build powder section 108 of the powder layer 106.

[0148] Thus, the combination of simultaneously measuring and selectively controlling mass and mass flow rate controls the build powder composition and deposition of the build powder 102 in real time to form the build powder section 108 of the powder layer 106. In one or more exemplary implementations of the additive manufacturing system 200 and method 1000, the desired layer thickness (T) of the powder layer 106 and the percent composition of each build powder component (e.g., the first build powder component 122 and the second build powder component 124) are provided as inputs to the controller 250. For a given powder gradient 152, the percent composition of each build powder component at the start of the pre-programmed tool path of the powder sprayer 204 (e.g., the first build powder composition) and the percent composition of each build powder component at the end of the pre-programmed tool path of the powder sprayer 204 (e.g., the second build powder composition) are provided as inputs to the controller 250. The controller 250 is configured to mathematically iterate through multiple points between the start and end points to provide the percent composition of each build powder component through the gradient zone during deposition of the build powder 102 .

[0149] In one or more examples, the component masses of each of the build powder components (e.g., the first mass of the first build powder component 122 and the second mass of the second build powder component 124) are known values for their specific material densities. In one or more examples, the material densities of the various build powder components are stored in a material lookup table accessible by the controller 250. The mass of the build powder 102 is measured before deposition to determine the average density of the resulting mixture of the build powder components (e.g., the first build powder component 122 and the second build powder component 124). Based on the measured mass of the build powder 102, the actual build powder composition of the build powder 102 can be electronically adjusted in real time to reach a desired (e.g., predetermined) build powder composition. The mass per unit volume of each of the build powder components is a known value based on the average particle size, and the exit volume at the discharge point (e.g., the discharge regulator 286 or the nozzle 208) is also a known value. The mass flow rate of the build powder 102 is measured during deposition. A feedback loop is used by the controller 250 to iterate the process parameters when the measured mass flow rate of the build powder 102 does not correlate 1:1 with the average particle density, so that the controller 250 automatically adjusts the amounts of the build powder components (e.g., the first build powder component 122 and the second build powder component 124) to achieve the desired build powder composition.

[0150] Thus, the controller 250 utilizes machine learning or artificial intelligence to actively control the build powder composition of the build powder 102 as it is deposited to form the build powder section 108 of the powder layer 106. Such active control also serves as quality control. Using the controller 250, an automated iterative process is performed, for example, using look-up tables, to determine both optimized build parameters and material composition at any instant and / or any time during each build of the object layer.

[0151] Thus, in one or more examples, the controller 250 is a feedback controller that uses, for example, sensor data from various mass sensors and mass flow sensors, and feedback control algorithms to generate commands for controlling the build powder composition and deposition rate of the build powder 102. Mass verification, for example, through real-time computational iterations and adjustments in analytical models and equations performed by the controller 250, serves as a continuous quality control check of the intended composition of the build powder 102.

[0152] The combination of varying parameters creates an iterative multivariable feedback algorithm utilized by controller 250. By way of example, controller 250 may use one or more of the following relationships during execution of the feedback control algorithm: M fp =(p p *Ve) / t

[0153] M fp is the mass flow rate of the powder particles at the exit orifice.

[0154] p p is the average density of the particles of the powder.

[0155] Ve is the volume of the powder exit orifice or discharge orifice.

[0156] t is time.

[0157] In one example, the mass flow rate of the build powder 102 corresponds to the mass flow rate of particles of the build powder 102 at the exit (e.g., discharge) orifice of the nozzle 208 or discharge regulator 286. In another example, the mass flow rate of any one of the build powder components corresponds to the mass flow rate of particles of the build powder component at the exit (e.g., discharge) orifice of the build powder component regulator associated with the build powder component.

[0158] In one or more examples, the average density of the particles (p p) is determined based on the percent composition of the build powder ingredients that form the powder. p p =(%Wt m1 *p m1 )+[1-(%Wt m1 )*p m2 ]

[0159] %Wt m1 is the weight percent of the first of the build powder components that form the powder (e.g., build powder first component 122).

[0160] p m1 is the average density of particles of the first of the build powder components that form the powder (e.g., build powder first component 122).

[0161] p m2 is the average density of the particles of the second of the build powder components that form the powder (e.g., build powder second component 124).

[0162] The illustrative example shows a build powder 102 formed by a mixture of two build powder components (e.g., a first build powder component 122 and a second build powder component 124), and therefore the powder gradient 152 includes gradient zones that vary the percent composition of the two build powder components. In other examples, the build powder 102 is formed by more than one build powder component, and therefore the powder gradient 152 includes gradient zones that vary the percent composition of the two or more build powder components.

[0163] 18, in one or more examples, the build powder 102 includes a mixture of a first build powder component 122, a second build powder component 124, and a number of additional build powder components 154. Accordingly, the powder sprayer 204 includes a number of additional build powder component feeders 322 that deliver the number of additional build powder components 154 to the mixer 230. Each of the several additional build powder component feeders 322 includes an additional build powder component hopper 324 and an additional build powder component regulator 326 that perform the functions described above.

[0164] Therefore, the average particle density (p p ) is scalable considering the number of build powder additional components 154.

[0165] So, for three build powder components, the average density is calculated as: p p =(%Wt m1 *p m1 )+[1-(%Wt m1 +%Wt m3 )*p m2 ]+[1-(%Wt m1 +%Wt m2 )*p m3 ]

[0166] %Wt m3 is the weight percent of the third of the build powder ingredients that form the powder (eg, one or more additional build powder ingredients 154).

[0167] p m3 is the average density of the particles of a third of the build powder ingredients (e.g., one of the build powder additional ingredients 154) that form the powder.

[0168] This same scaling procedure can be applied to any number of build powder components necessary or desired for any composition of build powder 102.

[0169] Referring to FIG. 1, the powder depositing and bonding operational steps of method 1000 may be repeated multiple times to form multiple successive powder layers, generate multiple successive object layers, and ultimately form object 100 (block 1010).

[0170] In one or more examples, the method 1000 includes selectively depositing build powder 102 inside a second build outline 132 of the object 100 to form a second build powder section 128 of the second powder layer 126. The method 1000 also includes selectively depositing support powder 104 outside the second build outline 132 to form a second support powder section 130 of the second powder layer 126. The method 1000 further includes bonding the build powder 102 in the second build powder section 128 of the second powder layer 126 to form a second object layer 148.

[0171] 12 and 13 , in one or more examples, a powder deposition device 202 ( FIGS. 2-5 ), such as a powder sprayer 204 ( FIGS. 14 , 15 , and 18 ), is configured to selectively deposit build powder 102 onto the inside of the second build shape 132 to form the second build powder section 128 of the powder layer 106. The powder deposition device 202 ( FIGS. 2-5 ), such as the powder sprayer 204 ( FIGS. 14 , 15 , and 18 ) and / or a recoater 206 ( FIG. 16 ), is configured to selectively deposit support powder 104 onto the outside of the second build shape 132 to form the second support powder section 130 of the second powder layer 126. In one or more examples, a powder bonding apparatus 212, such as a directed energy device 252 (FIG. 10) or a binder delivery device 254 (FIG. 11), is configured to bond the build powders 102 of the second build powder section 128 of the second powder layer 126 to form the second object layer 148.

[0172] In one or more examples, the build powder 102 and the support powder 104 are deposited to form the second powder layer 126 in substantially the same manner as described above with respect to the powder layer 106. In one or more examples, the build powders 102 of the second powder layer 126 are joined to form the second object layer 148 in substantially the same manner as described above with respect to the object layer 134.

[0173] 12 and 13 , the build outline 112 of powder layer 106 and the second build outline 132 of second powder layer 126 are the same. Thus, the object outline 146 of object layer 134 and the second object outline 150 of second object layer 148 are the same. In these examples, second object layer 148 is previously formed and is singly bonded to the object layer 134 below second object layer 148.

[0174] 19-22, in one or more examples, the construction outline 112 and the second construction outline 132 are different. Thus, the object outline 146 of the object layer 134 and the second object outline 150 of the second object layer 148 are different.

[0175] According to the method 1000, in one or more examples, selectively depositing build powder 102 inside the second build shape 132 includes disposing a first portion of the second build powder section 128 of the second powder layer 126 on the previously formed underlying object layer 134, and disposing a second portion of the second build powder section 128 of the second powder layer 126 on the support powder section 110 of the previously formed underlying powder layer 106. In these examples, the first portion of the second object layer 148 is unitarily bonded to the previously formed object layer 134 underlying the first portion of the second object layer 148, and the second portion of the second object layer 148 is supported by the support powder section 110 underlying the powder layer 106.

[0176] In one or more examples, the support powder 104 in the support powder section 110 of the powder layer 106 may not be able to adequately support the second portion of the second object layer 148. Referring to FIGS. 19 and 20 , in one or more examples, the method 1000 includes solidifying (block 1012) a portion of the support powder 104 in the support powder section 110 of the powder layer 106 to form the support layer 136. According to the method 1000, in one or more examples, selectively depositing the build powder 102 inside the second build shape 132 includes disposing a second portion of the second build powder section 128 of the second powder layer 126 on the previously formed underlying support layer 136, and disposing a first portion of the second build powder section 128 of the second powder layer 126 on the previously formed underlying object layer 134. In these examples, a first portion of the second object layer 148 is previously formed and is single-bonded to the object layer 134 underlying the first portion of the second object layer 148, and a second portion of the second object layer 148 is supported by the underlying support layer 136. The support layer 136 preferably provides a stable, solid structure that can adequately support the second portion of the second object layer 148.

[0177] 21 and 22 , in one or more examples, it may be preferable to prevent the second portion of the second object layer 148 from bonding with the previously formed, underlying support layer 136. Referring to FIGS. 21 and 22 , in one or more examples, the method 1000 includes selectively depositing support powder 104 inside the second build outline 132 to form an intermediate support powder layer 138 on the support layer 136 (block 1014). Thus, the selectively depositing support powder 104 inside the second build outline 132 to form the intermediate support powder layer 138 occurs before the selectively depositing build powder 102 inside the second build outline 132 to form the second build powder section 128 of the second powder layer 126. According to the method 1000, the selectively depositing support powder 104 inside the second build outline 132 positions the intermediate support powder layer 138 on the support layer 136. The step of selectively depositing build powder 102 inside the second build shape 132 involves disposing a second portion of the second build powder section 128 of the second powder layer 126 on the previously formed underlying intermediate support powder layer 138, and disposing a first portion of the second build powder section 128 of the second powder layer 126 on the previously formed underlying object layer 134. In these examples, the first portion of the second object layer 148 is singly bonded to the previously formed underlying object layer 134 with the first portion of the second object layer 148, and the second portion of the second object layer 148 is supported by a combination of the underlying support layer 136 and the intermediate support powder layer 138. The intermediate support powder layer 138 preferably prevents the second portion of the second object layer 148 from bonding to the previously formed underlying support layer 136.

[0178] In one or more examples, the thickness of the intermediate support powder layer 138 is a fraction of the thickness of a given powder layer. Thus, the support layer 136 provides structural support to a portion of the successive overlying object layer, and the intermediate support powder layer 138 provides a buffer between the object layer and the support layer 136 without changing the built shape of the object 100.

[0179] According to the method 1000, in one or more examples, the step of selectively controlling the build powder composition of the build powder 102 (block 1008) is applicable to the formation of the second build powder section 128 of the second powder layer 126. For example, the step of selectively controlling the build powder composition of the build powder 102 (block 1008) and the step of selectively depositing the build powder 102 are performed simultaneously. In one or more examples, the build powder composition of the build powder 102 used to form the second build powder section 128 of the second powder layer 126 is controlled in substantially the same manner as described above with respect to the build powder section 108 of the powder layer 106.

[0180] Thus, in one or more examples, implementations of additive manufacturing system 200 and method 1000 are used to form multiple powder layers, at least one of the multiple powder layers having a compositional gradient. In one or more examples, implementations of additive manufacturing system 200 and method 1000 are used to form multiple cross-sectional object layers of object 100, at least one of the multiple object layers having a compositional gradient. In one or more examples, implementations of additive manufacturing system 200 and method 1000 are used to create object 100, where object 100 has a compositional gradient.

[0181] In one or more examples, the compositional gradient within a given powder layer, and therefore the compositional gradient within a given object layer and object 100, is controlled under direction from controller 250 according to a predetermined plan stored in controller 250.

[0182] Referring to FIG. 1 , in one or more examples, method 1000 includes determining property data for object 100 (block 1016). In one or more examples, the property data represents a two-dimensional distribution of at least one desired material property of object 100 corresponding to a two-dimensional cross-sectional layer of object 100. For example, the property data is obtained from a three-dimensional model representing the distribution of the at least one desired material property of object 100, which is converted into two-dimensional layers. In one or more examples, the property data represents a three-dimensional distribution of at least one desired material property of object 100. For example, the property data is obtained from a three-dimensional model representing the distribution of the at least one desired material property of object 100, which is converted into a plurality of two-dimensional layers. In one or more examples, method 1000 includes determining or generating compositional data for a build powder section of each of a plurality of powder layers deposited to form object 100 (block 1018). In one or more examples, the compositional data represents a two-dimensional distribution of a build powder composition of a build powder section of a powder layer. The two-dimensional distribution of the build powder composition is mapped to a two-dimensional distribution of at least one material property of the object 100. In these examples, selectively controlling the compositional ratio of the build powder 102 (block 1008) includes adjusting the compositional ratio of the plurality of build powder components according to the two-dimensional distribution of the build powder composition of the build powder section of the powder layer. In one or more examples, the compositional data represents a three-dimensional distribution of the build powder composition of the build powder section of the plurality of powder layers deposited to form the object 100. The three-dimensional distribution of the build powder composition is mapped to a three-dimensional distribution of at least one material property of the object 100. In these examples, selectively controlling the compositional ratio of the build powder 102 (block 1008) includes adjusting the compositional ratio of the plurality of build powder components according to the three-dimensional distribution of the build powder composition of the build powder section of the plurality of powder layers. The at least one desired material property of the object 100 includes, but is not limited to, a desired physical property, chemical property, electrical property, thermal property, and / or magnetic property within a given object layer or within the object 100.

[0183] This disclosure recognizes that in certain applications of powder bed additive manufacturing, it may be desirable to reduce the area of the powder layer or the volume of the powder bed. Accordingly, one or more examples of additive manufacturing system 200 and method 1000 provide techniques for reducing the area of the powder layer or the volume of the powder bed, thereby reducing the amount of powder required to form the powder layer, reducing costs, shortening cycle times, and improving process efficiency.

[0184] 1 , in one or more examples, the method 1000 includes forming a barrier 142 (block 1020). The barrier 142 is configured to contain the powder layer 106. According to the method 1000, in one or more examples, the barrier 142 includes a closed cross section configured to surround the build shape 112 of the powder layer 106. In one or more examples, the barrier 142 is disposed at an exterior location, such as a periphery, of the build shape 112. In one or more examples, the barrier 142 forms at least a portion of the build shape 112.

[0185] 23 and 24 , in one or more examples, the additive manufacturing system 200 includes a barrier forming apparatus 256. The barrier forming apparatus 256 is configured to form the barrier 142. In one or more examples, the barrier 142 is formed on a build platform 262. The powder layer 106 is formed inside the barrier 142. In other words, the barrier 142 provides a peripheral boundary for the powder layer 106. In one or more examples, forming the barrier 142 (block 1020) occurs before selectively depositing the build powder 102 to form the build powder section 108 of the powder layer 106 (block 1002) and selectively depositing the support powder 104 to form the support powder section 110 of the powder layer 106 (block 1004).

[0186] In one or more examples, the powder layer 106 is formed by depositing the build powder 102 and the support powder 104 within a perimeter formed by a barrier 142, as described herein above. In these examples, the powder layer 106, consisting of the support powder 104 (support powder section 110) and the build powder 102 (build powder section 108), is located inside and bounded by the barrier 142. In these examples, the support powder section 110 of the powder layer 106 is located between the barrier 142 and the build outline 112. Thus, the use of the barrier 142 reduces the area of the powder layer 106, and more specifically, reduces the area of the support powder section 110 of the powder layer 106.

[0187] Alternatively, in one or more examples, the powder layer 106 is formed by depositing only the build powder 102 within a perimeter formed by the barrier 142, as described herein above. In these examples, the powder layer 106, consisting only of the build powder 102, is located inside and bounded by the barrier 142. Thus, the use of the barrier 142 reduces the area of the powder layer 106, allowing the powder layer 106 to be formed entirely from the build powder 102, while also reducing the unused amount of build powder 102 that may be wasted or require recycling.

[0188] In one or more examples, the barrier-forming apparatus 256 is movable relative to the build platform 262. In one or more examples, the barrier-forming apparatus 256 moves vertically (e.g., rises) relative to the build platform 262 as successive layers of the object 100 are formed. In one or more examples, the barrier-forming apparatus 256 moves horizontally relative to the build platform 262 as the barrier 142 is formed. In one or more examples, the barrier-forming apparatus 256 has multiple degrees of freedom to accommodate multi-axis movement to form the barrier 142 anywhere on the build platform 262.

[0189] In one or more examples, the additive manufacturing system 200 includes a barrier formation actuator 272 coupled to the barrier formation apparatus 256 and configured to drive movement of the barrier formation apparatus 256. In one or more examples, the barrier formation actuator 272 includes or takes the form of a linear actuator, a robotic actuator arm (e.g., a six-axis robotic actuator arm), or the like.

[0190] In one or more examples, forming the barrier 142 (block 1020) includes selectively depositing wires 140 to form the barrier 142. Thus, as shown in FIGS. 25 and 26 , in one or more examples, the barrier formation apparatus 256 includes a wire deposition device 258. The wire deposition device 258 is configured to dispense or supply the wires 140 to the growth surface while directing an energy beam at the growth surface to melt the wires 140 and form a liquid molten pool. The wire deposition device 258 moves across the growth surface under direction from the controller 250, supplying the wires 140 to the molten pool to form the barrier 142. When forming the barrier 142 associated with the powder layer 106 (e.g., the initial powder layer), the growth surface is the surface of the build platform 262.

[0191] The wire deposition device 258 includes any suitable energy additive manufacturing device with a wire feed. In one or more examples, the wire deposition device 258 includes a wire feeder configured to distribute the wire 140 and a directed energy device (e.g., a laser) configured to generate and emit an energy beam (e.g., a laser beam) to form the melt pool.

[0192] The wires 140 include any solid wire material suitable for being delivered to a molten pool and melted to build up the layered barrier 142. Examples of wires 140 include, but are not limited to, metal wires, metal alloy wires, polymer wires, etc.

[0193] Once the powder layer 106 is formed within the barrier 142, the build powder 102 is bonded to form the object layer 134 as described above. This forming and bonding process is repeated multiple times to form multiple successive barrier layers (multiple layers of the barrier 142), to form multiple successive powder layers, to form multiple successive object layers, and ultimately to form the object 100. Following the formation of each object layer, the successive layer of the barrier 142 is formed on a previously formed underlying layer of the barrier 142 before forming the successive powder layer. When forming a successive layer of the barrier 142 associated with a successive powder layer, the growth surface is the surface of the previously formed underlying layer of the barrier 142.

[0194] In one or more examples, forming the barrier 142 (block 1020) includes bonding the support powder 104 in a selected portion of the support powder section 110 of the powder layer 106 to form the barrier 142. In one or more examples, bonding the support powder 104 includes, for example, using a binder 220 to bind the support powder 104 in the selected portion of the support powder section 110. Thus, as shown in FIGS. 27 and 28 , in one or more examples, the barrier forming apparatus 256 includes a binder delivery device 254. The binder delivery device 254 is configured to deposit the binder 220 onto the support powder 104. The binder 220 is suitable for bonding the support powder 104 in the selected portion of the support powder section 110 of the powder layer 106 to form a solid layer of the barrier 142.

[0195] In one or more examples, the support powder 104 is deposited to form at least a portion of the support powder section 110 of the powder layer 106, for example, using the powder deposition apparatus 202 described herein above. The support powder 104 in selected portions of the support powder section 110 is bound via a binder 220 to form the barrier 142 using a binder delivery device 254. Following the formation of the barrier 142, the build powder 102 is deposited to form the build powder section 108 of the powder layer 106, for example, using the powder deposition apparatus 202 described herein above. Once the powder layer 106 is formed within the barrier 142, the build powder 102 is bonded to form the object layer 134 as described herein above. This forming and bonding process is repeated multiple times to form multiple successive barrier layers (multiple layers of the barrier 142), to form multiple successive powder layers, to form multiple successive object layers, and ultimately to form the object 100. Following the formation of each of the object layers, a successive layer of barrier 142 is formed over the previously formed underlying layer of barrier 142 before forming the successive powder layers.

[0196] Throughout this disclosure, example operational steps of the method 1000 and components of the additive manufacturing system 200 described with respect to depositing build powder 102 to form a build powder section 108 of the powder layer 106, depositing support powder 104 to form a support powder section 110 of the powder layer 106, and joining build powder 102 to form an object layer 134 are equally applicable to the operational steps and components for depositing build powder 102 to form a second build powder section 128 of the second powder layer 126, depositing support powder 104 to form a second support powder section 130 of the second powder layer 126, and joining build powder 102 to form a second object layer 148, as well as to the formation of several successive powder layers and the formation of several successive object layers. Furthermore, additional components, such as additional powder feeders, regulators, nozzles, directed energy devices, etc., may be included in the additive manufacturing system 200 without departing from the scope of this disclosure.

[0197] As described herein, the controller 250 communicates with and / or controls various components of the additive manufacturing system 200. In one or more examples, the controller 250 is a computing device including a processor and memory. The memory may be a computer-readable memory medium configured to store data necessary for the operation of the additive manufacturing system 200. The computer-readable memory medium is any medium that can be used to store information that can then be accessed by a processor. The computer-readable memory medium may include computer memory and data storage devices. The computer memory may be fast-access memory and may be used to execute program instructions executable by the processor. The computer memory may include random access memory (RAM), flash memory, and read-only memory (ROM). The data storage device may be a physical device and may be used to store any information or computer program that can be accessed by the processor, such as an operating system, computer programs, program modules, and program data. The data storage devices and their associated computer-readable memory media provide storage of computer-readable instructions, data structures, program modules, and other data for the system. Data storage devices may include magnetic media such as floppy disks, hard disk drives, and magnetic tape; optical media such as compact disks (CDs), digital video disks (DVDs), and Blu-ray disks; and solid-state memory such as random access memory (RAM), flash memory, and read-only memory (ROM).

[0198] In one or more examples, the memory contains data packets of data necessary for controlled operation of the additive manufacturing system 200. For example, one data packet may contain data necessary for controlling the powder deposition device 202, and another data packet may contain data necessary for controlling the powder bonding device. The processor communicates with the memory to retrieve the data necessary to control the operation of the additive manufacturing system 200.

[0199] In one or more examples, the subject matter of this disclosure will be described with reference to symbolic representations of acts and operations that are performed by one or more computers or computer systems, unless otherwise indicated. It will be understood, therefore, that such acts and operations, sometimes referred to as computer-executed, include manipulation by one or more processors of the additive manufacturing system 200, such as the controller 250, via electrical signals that represent data in a structured format. This manipulation transforms the data or maintains the data in specific locations within the memory of the additive manufacturing system 200, which reconfigures or alters the operation of the additive manufacturing system 200 in a manner well understood by those skilled in the art. The data structures in which the data is maintained are physical locations of memory that have specific characteristics defined by the format of the data. However, while one or more examples are described in the foregoing context, this is not meant to be limiting, in that one skilled in the art will understand that some of the acts and operations described herein may be implemented in hardware, software, and / or firmware and / or some combination thereof.

[0200] 29 and 30, the example method 1000 and additive manufacturing system 200 may be used in the context of an aircraft manufacturing and service method 1100 as shown in the flow chart of FIG. 29 and an aircraft 1200 as shown schematically in FIG. 30.

[0201] 30 , in one or more examples, aircraft 1200 includes an airframe 1202, an interior 1206, and multiple high-level systems 1204. Examples of high-level systems 1204 include one or more of a propulsion system 1208, an electrical system 1210, a hydraulic system 1212, and an environmental system 1214. In other examples, aircraft 1200 may include any number of other types of systems, such as a communication system, a guidance system, etc. The object 100 created using additive manufacturing system 200 according to method 1000 may be a structure, an assembly, a subassembly, a component, a part, or any other portion of aircraft 1200, such as part of airframe 1202 or of interior 1206.

[0202] 29 , method 1100 includes, prior to production, specification and design of aircraft 1200 (block 1102) and material procurement (block 1104). During production of aircraft 1200, component and subassembly manufacturing (block 1106) and systems integration of aircraft 1200 (block 1108) occur. Aircraft 1200 then undergoes certification and delivery (block 1110) and in-service (block 1112). Periodic maintenance and service inspections (block 1114) include modification, reconfiguration, retrofitting, etc. of one or more systems of aircraft 1200.

[0203] 29 may be performed by a system integrator, a third party, and / or an operator (e.g., a customer). For purposes of this description, a system integrator may include, without limitation, any number of spacecraft manufacturers and subcontractors of major systems, a third party may include, without limitation, any number of vendors, subcontractors, and suppliers, and an operator may be an airline, a leasing company, a military department, a service organization, etc.

[0204] The example method 1000 and additive manufacturing system 200 shown and described herein may be used during any one or more stages of the manufacturing and service method 1100 illustrated in the flow chart shown in FIG. 29. In one example, implementation of the disclosed method 1000 and additive manufacturing system 200 may form part of component and subassembly manufacturing (block 1106) and / or system integration (block 1108). For example, assembly of the aircraft 1200 and / or its components using an implementation of the disclosed method 1000 and additive manufacturing system 200 may correspond to component and subassembly manufacturing (block 1106) and may be prepared in a similar manner as a component or subassembly while the aircraft 1200 is in service (block 1112). Additionally, implementation of the disclosed method 1000 and additive manufacturing system 200 may be utilized during system integration (block 1108) and certification and delivery (block 1110). Similarly, implementations of the disclosed method 1000 and additive manufacturing system 200 may be utilized, for example, but not limited to, while the aircraft 1200 is in service (block 1112) and during maintenance and overhaul (block 1114).

[0205] Although an aerospace (e.g., aircraft or spacecraft) example is shown, the examples and principles disclosed herein may be applied to other industries, such as the automotive industry, the construction industry, the wind turbine industry, the electronics industry, and other design and manufacturing industries. Thus, in addition to aircraft and spacecraft, the examples and principles disclosed herein may be applied to powder bed additive manufacturing processes used to form objects used in other vehicles (e.g., land vehicles, sea vehicles, construction vehicles, etc.), machines, and standalone structures.

[0206] As used herein, a system, apparatus, device, structure, article, element, component, or hardware that is "configured to" perform a particular function is actually capable of performing the particular function without modification, rather than merely having the potential to perform the particular function after further modification. In other words, a system, apparatus, device, structure, article, element, component, or hardware that is "configured to" perform a particular function is specifically selected, created, implemented, utilized, programmed, and / or designed for the purpose of performing the particular function. As used herein, "configured to" refers to existing characteristics of a system, apparatus, structure, article, element, component, or hardware that enable the system, apparatus, structure, article, element, component, or hardware to perform a particular function without further modification. For purposes of this disclosure, a system, apparatus, device, structure, article, element, component, or hardware that is described as "configured to" perform a particular function may additionally or alternatively be described as "adapted to" and / or "functioning to" perform that function.

[0207] Unless otherwise indicated, terms such as "first," "second," "third," etc. are used merely as labels and are not intended to impose any order, position, or hierarchy on the items to which these terms refer. Further, a reference to, for example, a "second" item does not require or preclude the presence of, for example, a "first" or lower-numbered item, and / or a "third" or higher-numbered item, etc.

[0208] For purposes of this disclosure, the terms "coupled," "couple," and similar terms refer to two or more elements that are joined, linked, secured, attached, connected, in communication with, or otherwise associated with one another (e.g., mechanically, electrically, fluidly, optically, electromagnetically). In various examples, the elements may be directly or indirectly associated. As an example, element A may be directly associated with element B. As another example, element A may be indirectly associated with element B, e.g., through another element C. It will be understood that not all relationships between the various disclosed elements are necessarily depicted. Thus, other couplings than those shown in the figures may exist.

[0209] As used herein, the term "approximately" refers to or describes a state that is close to, but not exactly as, the described state, which still performs a desired function or achieves a desired result. As an example, the term "approximately" refers to a state that is within an acceptable predetermined tolerance or precision. For example, the term "approximately" refers to a state that is within 10% of the described state. However, the term "approximately" does not exclude a state that is the same as the described state.

[0210] Those skilled in the art will understand that some of the elements, features, and / or components described and illustrated in the above-referenced FIGS. 2-28 and 30 may be combined in various ways without necessarily including other features described and illustrated in FIGS. 2-28 and 30, other drawings, and / or accompanying disclosures, even if such combinations are not explicitly shown herein. Similarly, additional features, not limited to the examples presented, may be combined with some or all of the features shown and described herein. Unless otherwise specified, the schematic illustrations of the examples shown in the above-referenced FIGS. 2-28 and 30 do not imply structural limitations with respect to the illustrative example. Rather, one exemplary structure is shown, but it should be understood that the structure may be modified where appropriate. Accordingly, modifications, additions, and / or omissions may be made to the illustrated structure. Furthermore, those skilled in the art will understand that not all elements described and illustrated in the above-referenced FIGS. 2-28 and 30 need be included in every example, and not all elements described herein necessarily are shown in each illustrative example.

[0211] In the above-referenced FIGS. 1 and 29, blocks may represent operations, steps, and / or portions thereof, and lines connecting various blocks do not imply a particular order or dependency of operations or portions thereof. It will be understood that not all dependencies between various disclosed operations are necessarily represented. The above-referenced FIGS. 1 and 29 and the accompanying disclosure describing the operations of the disclosed methods described herein should not be construed as necessarily dictating the sequence in which operations are performed. Rather, while one exemplary order is shown, it should be understood that the sequence of operations may be changed when appropriate. Accordingly, modifications, additions, and / or omissions may be made to the illustrated operations, and certain operations may be performed in a different order or simultaneously. Furthermore, one skilled in the art will understand that not all of the operations described need be performed.

[0212] Furthermore, throughout this specification, references to features, advantages, or similar language used herein do not imply that all features and advantages that may be realized in the examples disclosed herein are to be or are present in any single example. Rather, language referring to features and advantages is understood to mean that the particular feature, advantage, or characteristic described in connection with the example is included in at least one example. Thus, descriptions of features, advantages, and similar language used throughout this disclosure can, but do not necessarily, refer to the same example. Additionally, the present disclosure includes the following example embodiments:

[0213] Example 1. A method (1000) for additive manufacturing an object (100), the method (1000) comprising: Selectively depositing build powder (102) inside a build contour (112) of the object (100) to form a build powder section (108) of the powder layer (106); Selectively depositing support powder (104) outside of a build shape (112) to form a support powder section (110) of a powder layer (106); Including, The build powder (102) comprises a build powder composition; The support powder (104) comprises a support powder composition; The build powder composition and the support powder composition are different, Method(1000).

[0214] Example 2. A step of selectively depositing support powder (104) precedes a step of selectively depositing build powder (102), resulting in: a support powder boundary (114) of the support powder section (110) of the powder layer (106) forms a build outline (112); The build powder boundary (116) of the build powder section (108) of the powder layer (106) is adjacent to the support powder boundary (114) of the support powder section (110) of the powder layer (106). The method described in Example 1 (1000).

[0215] Example 3. A step of selectively depositing build powder (102) precedes a step of selectively depositing support powder (104), resulting in: a build powder boundary (116) of the build powder section (108) of the powder layer (106) forms a build outline (112); The support powder boundary (114) of the support powder section (110) of the powder layer (106) is adjacent to the build powder boundary (116) of the build powder section (108) of the powder layer (106). The method described in Example 1 (1000).

[0216] Example 4. The method (1000) of Example 1, wherein selectively depositing the build powder (102) comprises selectively discharging the build powder (102) using a powder sprayer (204).

[0217] Example 5. The method (1000) of Example 4, wherein selectively depositing the support powder (104) comprises selectively discharging the support powder (104) using a powder sprayer (204).

[0218] Example 6. The method (1000) of Example 4, wherein selectively depositing the support powder (104) includes selectively discharging the support powder (104) using a recoater (206).

[0219] Example 7. The method (1000) of Example 1, further comprising selectively controlling the build powder composition of the build powder (102).

[0220] Example 8. The method (1000) of Example 7, wherein the steps of selectively controlling the build powder composition and selectively depositing the build powder (102) are performed simultaneously.

[0221] Example 9. The method (1000) of Example 7, wherein selectively controlling the build powder composition of the build powder (102) comprises selectively varying the build powder composition of the build powder (102) to achieve a powder gradient (152) within the build powder section (108) of the powder layer (106).

[0222] Example 10. The build powder (102) comprises a mixture of a first build powder component (122) and a second build powder component (124), Selectively controlling the build powder composition of the build powder (102) includes selectively controlling the composition ratio of a first build powder component (122) and a second build powder component (124); The method described in Example 7 (1000).

[0223] Example 11. The step of selectively controlling the composition ratio of the first build powder component (122) and the second build powder component (124) comprises: Measuring a first mass of a build powder first component (122); measuring a second mass of a second build powder component (124); measuring the mass of the build powder (102) comprising a mixture of the first build powder component (122) and the second build powder component (124); The method (1000) according to Example 10, comprising:

[0224] Example 12. The step of selectively controlling the composition ratio of the first build powder component (122) and the second build powder component (124) comprises: Selectively controlling a first mass flow rate of a build powder first component (122); Selectively controlling a second mass flow rate of a second build powder component (124); The method (1000) according to Example 11, comprising:

[0225] Example 13. The method (1000) of Example 11, wherein the step of selectively controlling the composition ratio of the first build powder component (122) and the second build powder component (124) further comprises measuring the mass flow rate of the build powder (102) comprising a mixture of the first build powder component (122) and the second build powder component (124).

[0226] Example 14. The method (1000) of Example 1, further comprising joining build powder (102) of the build powder section (108) of the powder layer (106) to form the object layer (134).

[0227] Example 15. The method (1000) of Example 14, wherein joining the build powders (102) of the build powder section (108) of the powder layer (106) comprises fusing the build powders (102) of the build powder section (108).

[0228] Example 16. The method (1000) of Example 14, wherein joining the build powders (102) of the build powder section (108) of the powder layer (106) comprises bonding the build powders (102) of the build powder section (108).

[0229] Example 17. Selectively depositing build powder (102) inside a second build contour (132) of an object (100) to form a second build powder section (128) of a second powder layer (126); selectively depositing support powder (104) outside the second build shape (132) to form a second support powder section (130) of the second powder layer (126); The method (1000) of Example 14, further comprising:

[0230] Example 18. The method further comprising joining a portion of the support powder (104) of the support powder section (110) of the powder layer (106) to form a support layer (136); The construction outline (112) and the second construction outline (132) are different; Selectively depositing the build powder (102) inside the second build contour (132) of the object (100) includes disposing a portion of the second build powder section (128) of the second powder layer (126) on the support layer (136) and disposing another portion of the second build powder section (128) of the second powder layer (126) on the object layer (134); The method described in Example 17 (1000).

[0231] Example 19. Joining a portion of support powder (104) of a support powder section (110) of a powder layer (106) to form a support layer (136); selectively depositing support powder (104) inside the second build contour (132) to form an intermediate support powder layer (138) before selectively depositing build powder (102) inside the second build contour (132); further comprising The step of selectively depositing support powder (104) inside the second build contour (132) of the object (100) includes disposing an intermediate support powder layer (138) on the support layer (136); The step of selectively depositing the build powder (102) inside the second build outline (132) of the object (100) includes disposing a portion of the second build powder section (128) of the second powder layer (126) on the intermediate support powder layer (138) and disposing another portion of the second build powder section (128) of the second powder layer (126) on the object layer (134); The method described in Example 17 (1000).

[0232] Example 20. The method (1000) of Example 17, further comprising selectively controlling the build powder composition of the build powder (102).

[0233] Example 21. The method (1000) of Example 20, wherein selectively controlling the build powder composition of the build powder (102) comprises selectively varying the build powder composition to achieve a powder gradient (152) within the build powder section (108) of the powder layer (106) and within the second build powder section (128) of the second powder layer (126).

[0234] Example 22. The build powder (102) comprises a mixture of a first build powder component (122) and a second build powder component (124), Selectively controlling the build powder composition of the build powder (102) includes selectively controlling the composition ratio of a first build powder component (122) and a second build powder component (124); The method described in Example 20 (1000).

[0235] Example 23. The step of selectively controlling the composition ratio of the first build powder component (122) and the second build powder component (124) comprises: Measuring a first mass of a build powder first component (122); measuring a second mass of a second build powder component (124); measuring the mass of the build powder (102) comprising a mixture of the first build powder component (122) and the second build powder component (124); The method (1000) according to Example 22, comprising:

[0236] Example 24. The step of selectively controlling the composition ratio of the first build powder component (122) and the second build powder component (124) comprises: Selectively controlling a first mass flow rate of a build powder first component (122); Selectively controlling a second mass flow rate of a second build powder component (124); The method (1000) according to Example 23, comprising:

[0237] Example 25. The method (1000) of Example 23, wherein the step of selectively controlling the composition ratio of the first build powder component (122) and the second build powder component (124) further comprises measuring the mass flow rate of the build powder (102) comprising a mixture of the first build powder component (122) and the second build powder component (124).

[0238] Example 26. The method (1000) of Example 1, further comprising forming a barrier (142) having a closed cross-section, wherein the powder layer (106) is bounded by the barrier (142).

[0239] Example 27. The method (1000) of Example 26, wherein forming a barrier (142) comprises selectively depositing an interconnect (140).

[0240] Example 28. The method (1000) of Example 26, wherein forming the barrier (142) includes bonding a portion of the support powder (104) of the support powder section (110) of the powder layer (106).

[0241] Example 29. A method (1000) for additive manufacturing of an object (100), comprising: selectively depositing build powder (102) inside a build contour (112) of an object (100) to form a build powder section (108) of a powder layer (106), the build powder (102) comprising a build powder composition; Selectively varying a build powder composition of the build powder (102) to achieve a powder gradient (152) within a build powder section (108) of the powder layer (106); selectively depositing support powder (104) on an exterior of a build shape (112) to form a support powder section (110) of a powder layer (106), the support powder (104) comprising a support powder composition; Includes The build powder composition and the support powder composition are different, Method(1000).

[0242] Example 30. The step of selectively depositing the build powder (102) comprises selectively discharging the build powder (102) using a powder sprayer (204); the step of selectively depositing the support powder (104) includes selectively discharging the support powder (104) using a powder sprayer (204); The method described in Example 29 (1000).

[0243] Example 31. The step of selectively depositing the build powder (102) comprises selectively discharging the build powder (102) using a powder sprayer (204); The step of selectively depositing the support powder (104) includes the step of selectively discharging the support powder (104) using a recoater (206); The method described in Example 29 (1000).

[0244] Example 32. The method (1000) of example 29, further comprising forming a barrier (142) surrounding the build shape (112), wherein the powder layer (106) is formed inside the barrier (142).

[0245] Example 33. Selectively depositing build powder (102) inside a build contour (112) to form a build powder section (108) of a powder layer (106); Selectively depositing support powder (104) outside of the build shape (112) to form a support powder section (110) of the powder layer (106). A powder deposition device (202) configured to An additive manufacturing system (200) comprising: The build powder (102) comprises a build powder composition; The support powder (104) comprises a support powder composition; The build powder composition and the support powder composition are different, Additive manufacturing system (200).

[0246] Example 34. A powder deposition device (202) is configured to selectively deposit support powder (104) before the build powder (102) is selectively deposited, such that: a support powder boundary (114) of the support powder section (110) of the powder layer (106) forms a build outline (112); The build powder boundary (116) of the build powder section (108) of the powder layer (106) is adjacent to the support powder boundary (114) of the support powder section (110) of the powder layer (106). 34. The additive manufacturing system (200) of Example 33.

[0247] Example 35. A powder deposition device (202) is configured to selectively deposit build powder (102) before support powder (104) is selectively deposited, such that: a build powder boundary (116) of the build powder section (108) of the powder layer (106) forms a build outline (112); The support powder boundary (114) of the support powder section (110) of the powder layer (106) is adjacent to the build powder boundary (116) of the build powder section (108) of the powder layer (106). 34. The additive manufacturing system (200) of Example 33.

[0248] Example 36. A powder deposition apparatus (202) comprising a powder sprayer (204) configured to selectively deposit a build powder (102); The powder sprayer (204) a build powder feeder (222) configured to selectively dispense build powder (102); a nozzle (208) coupled to the build powder feeder (222) and configured to selectively discharge the build powder (102); Equipped with 34. The additive manufacturing system (200) of Example 33.

[0249] Example 37. A powder sprayer (204) configured to selectively deposit support powder (104), further comprising a support powder feeder (224) configured to selectively dispense the support powder (104); a nozzle (208) coupled to the support powder feeder (224) and configured to selectively discharge the support powder (104); 37. The additive manufacturing system (200) of Example 36.

[0250] Example 38. A powder deposition apparatus (202) comprising a recoater (206) configured to selectively deposit support powder (104); Ricota (206) a support powder feeder (224) configured to selectively dispense support powder (104); a roller (210) configured to collect support powder (104) from a support powder feeder (224) and selectively discharge the support powder (104); Equipped with 37. The additive manufacturing system (200) of Example 36.

[0251] Example 39. The additive manufacturing system (200) of Example 36, wherein the powder sprayer (204) is configured to selectively control the build powder composition of the build powder (102).

[0252] Example 40. The additive manufacturing system (200) of Example 36, wherein the powder sprayer (204) is configured to selectively vary a build powder composition of the build powder (102) to achieve a powder gradient (152) within the build powder section (108) of the powder layer (106).

[0253] Example 41. The build powder (102) comprises a mixture of a first build powder component (122) and a second build powder component (124), The construction powder feeder (222) a build powder first component feeder (226) configured to selectively dispense a build powder first component (122); a build powder second component feeder (228) configured to selectively dispense the build powder second component (124); a mixer (230) coupled to the build powder first component feeder (226) and the build powder second component feeder (228), Mixing together the build powder first component feeder (226) and the build powder second component feeder (228); a build powder (102), Selectively dispensing build powder (102) into nozzle (208) a mixer (230) configured as follows: Equipped with 41. The additive manufacturing system (200) of Example 40.

[0254] Example 42. A build powder first component feeder (226) comprising a build powder first component regulator (232) configured to selectively control the composition percentage of the build powder first component feeder (226) in the build powder (102) contained in the mixer (230); the build powder second component feeder (228) comprises a build powder second component regulator (234) configured to selectively control the composition percentage of the build powder second component feeder (228) in the build powder (102) contained in the mixer (230); the mixer (230) comprising a mixer regulator (316) configured to selectively control the mass flow rate of the build powder (102) dispensed into the nozzle (208); 42. The additive manufacturing system (200) of Example 41.

[0255] Example 43. A build powder first component regulator (232) comprising a build powder first component mass sensor (238) configured to measure a first mass of the build powder first component (122); the build powder second component regulator (234) comprises a build powder second component mass sensor (246) configured to measure a second mass of the build powder second component (124); the mixer regulator (316) comprises a mixer mass sensor (320) configured to measure the mass of the build powder (102); 43. The additive manufacturing system (200) of Example 42.

[0256] Example 44. The build powder first component regulator (232) further comprises a build powder first component mass flow sensor (240) configured to measure a first mass flow rate of the build powder first component (122); the build powder second component regulator (234) further comprises a build powder second component mass flow sensor (248) configured to measure a second mass flow rate of the build powder second component (124); 44. The additive manufacturing system (200) of Example 43.

[0257] Example 45. The additive manufacturing system (200) of Example 41, further comprising an exhaust regulator (286) configured to measure and selectively control the mass flow rate of the build powder (102) exhausted from the nozzle (208).

[0258] Example 46. Selectively controlling the movement of the powder sprayer (204) according to a build powder deposition pattern; Selectively adjusting the composition ratio of the first build powder component (122) and the second build powder component (124) in the build powder (102) dispensed from the mixer (230) at different locations along the build powder deposition pattern. 42. The additive manufacturing system (200) of Example 41, further comprising a controller (250) configured to:

[0259] Example 47. The additive manufacturing system (200) of Example 33, further comprising a powder bonding device (212) configured to bond the build powder (102) of the build powder section (108) of the powder layer (106).

[0260] Example 48. The additive manufacturing system (200) of Example 47, wherein the powder bonding device (212) is configured to bond a portion of the support powder (104) of the support powder section (110) of the powder layer (106).

[0261] Example 49. The additive manufacturing system (200) of Example 47, wherein the powder bonding apparatus (212) comprises a directed energy device (252) configured to generate an energy beam (218) suitable for fusing the build powder (102) of the build powder section (108) of the powder layer (106).

[0262] Example 50. The additive manufacturing system (200) of Example 47, wherein the powder bonding apparatus (212) comprises a binder delivery device (254) configured to deposit a binder (256) suitable for bonding the build powder (102) of the build powder section (108) of the powder layer (106).

[0263] Example 51. The additive manufacturing system (200) of Example 47, further comprising a trace deposition device (258) configured to dispense traces (140) to form a barrier (142), and the powder deposition apparatus (202) configured to selectively deposit the support powder (104) and the build powder (102) inside the barrier (142).

[0264] Example 52. A powder bonding apparatus (212) comprising a binder delivery device (254) configured to selectively deposit a binder (220) suitable for bonding a portion of the support powder (104) of the support powder section (110) of the powder layer (106) and forming a barrier (142); a powder deposition device (202) configured to selectively deposit build powder (102) inside the barrier (142); 48. The additive manufacturing system (200) of Example 47.

[0265] The described features, advantages, and characteristics of one example may be combined in any suitable manner in one or more other examples. Those skilled in the relevant art will recognize that the examples described herein may be practiced without one or more specific features or advantages of a particular example. In other examples, additional features and advantages may be recognized in a particular example that may not be present in all examples. Furthermore, while various examples of method 1000 and additive manufacturing system 200 have been shown and described, modifications may occur to those skilled in the art upon reading the specification. The present application includes such modifications and is limited only by the scope of the claims. [Explanation of symbols]

[0266] 100 objects 102 Construction Powder 104 Support powder 106 Powder layer 108 Construction Powder Section 110 Support Powder Section 112 Construction Outline 114 Supported Powder Boundary 116 Construct Powder Boundary 122 Construction Powder 1st Component 124 Construction Powder 2nd Component 126 Second powder layer 128 Second Construction Powder Section 130 Second Support Powder Section 132 Second Construction Outline 134 Object Layer 136 Support layer 138 Intermediate support powder layer 140 Wiring 142 Barrier 144 Powder bed 146 Object Outlines 148 Second Object Layer 150 Second Object Outline 152 Powder Gradient 154 Construction Powder Additional Ingredients 200 Additive Manufacturing System 202 Powder deposition equipment 204 Powder sprayer 206 Recoater 208 nozzle 210 Roller 212 Powder bonding equipment 218 Energy Beam 220 Binder 222 Construction Powder Feeder 224 Support Powder Feeder 226 Construction Powder First Component Feeder 228 Construction Powder Second Component Feeder 230 Mixer 232 Construction Powder First Component Regulator 234 Construction Powder Second Component Regulator 236 Construction Powder First Component Valve 238 Constructed Powder First Component Mass Sensor 240 Constructed Powder First Component Mass Flow Sensor 244 Construction Powder Second Component Valve 246 Constructed Powder Second Component Mass Sensor 248 Constructed Powder Secondary Component Mass Flow Sensor 250 Controller 252 Directed Energy Devices 254 Binder Delivery Device 256 Barrier forming device 258 Wiring deposition device 260 Construction Chamber 262 Building Platform 264 Supply Line 268 Construction Powder Hopper 270 Construction Powder Regulator 272 Barrier-forming actuator 274 Construction Powder Valve 276 Constructed Powder Mass Sensor 278 Mass Flow Sensor 280 Construction Platform Actuator 282 Powder Deposition Actuator 284 Powder Bonded Actuator 286 Emission Regulator 288 Discharge valve 290 Tank 292 Propulsion Regulator 294 Gas Propellant 296 Support Powder Hopper 298 Support Powder Regulator 300 Support Powder Valve 302 Support Powder Mass Sensor 304 Adhesion mechanism 306 Surface 308 Release mechanism 310 Power supply 312 Construction Powder 1st Component Hopper 314 Construction Powder Second Component Hopper 316 Mixer regulator 318 Mixer valve 320 Mixer Mass Sensor 322 Construction Powder Additive Feeder 324 Construction Powder Add-Ingredient Hopper 326 Construction Powder Additional Ingredient Regulator 1000 ways 1100 Maintenance and inspection methods 1200 aircraft 1202 aircraft 1204 High Level Systems 1206 Internal 1208 Propulsion System 1210 Electrical System 1212 Hydraulic System 1214 Environmental Systems

Claims

1. A method (1000) for additive manufacturing of an object (100), said method (1000) comprising: selectively depositing build powder (102) inside a build contour (112) of the object (100) to form a build powder section (108) of a powder layer (106); Selectively depositing support powder (104) outside the build shape (112) to form a support powder section (110) of the powder layer (106); Including, The build powder (102) comprises a build powder composition; The support powder (104) comprises a support powder composition; the build powder composition and the support powder composition are different; the steps of selectively controlling the build powder composition and selectively depositing the build powder (102) are performed simultaneously; Selectively controlling the build powder composition of the build powder (102) comprises selectively varying the build powder composition of the build powder (102) to achieve a powder gradient (152) within the build powder section (108) of the powder layer (106); the build powder (102) comprises a mixture of a first build powder component (122) and a second build powder component (124); selectively controlling the build powder composition of the build powder (102) comprises selectively controlling the composition ratio of the first build powder component (122) and the second build powder component (124); Selectively controlling the composition ratio of the first build powder component (122) and the second build powder component (124) comprises: measuring a first mass of the build powder first component (122); measuring a second mass of the build powder second component (124); measuring the mass of said build powder (102) including said mixture of said first build powder component (122) and said second build powder component (124); A method (1000) comprising:

2. The step of selectively depositing the support powder (104) occurs before the step of selectively depositing the build powder (102), so that: a support powder boundary (114) of the support powder section (110) of the powder layer (106) forms the build shape (112); 2. The method of claim 1, wherein a build powder boundary of the build powder section of the powder layer is adjacent to a support powder boundary of the support powder section of the powder layer.

3. The step of selectively depositing the build powder (102) occurs before the step of selectively depositing the support powder (104), so that: a build powder boundary (116) of the build powder section (108) of the powder layer (106) forms the build outline (112); 3. The method of claim 1, wherein a support powder boundary of the support powder section of the powder layer is adjacent to a build powder boundary of the build powder section of the powder layer.

4. Selectively controlling the composition ratio of the first build powder component (122) and the second build powder component (124) comprises: Selectively controlling a first mass flow rate of the build powder first component (122); Selectively controlling a second mass flow rate of the build powder second component (124); The method (1000) of claim 1, further comprising:

5. selectively depositing build powder (102) inside a build contour (112) to form a build powder section (108) of the powder layer (106); 1. An additive manufacturing system (200) comprising: a powder deposition device (202) that selectively deposits support powder (104) on an exterior of the build shape (112) to form a support powder section (110) of the powder layer (106), The build powder (102) comprises a build powder composition; The support powder (104) comprises a support powder composition; the build powder composition and the support powder composition are different; the powder deposition device (202) comprises a powder sprayer (204) configured to selectively deposit the build powder (102) and to selectively vary the build powder composition of the build powder (102) to achieve a powder gradient (152) within the build powder section (108) of the powder layer (106), wherein the selective control of the build powder composition and the selective deposition of the build powder (102) are performed simultaneously; The powder sprayer (204) a build powder feeder (222) configured to selectively dispense said build powder (102); a nozzle (208) coupled to the build powder feeder (222) and configured to selectively discharge the build powder (102); Equipped with the build powder (102) comprises a mixture of a first build powder component (122) and a second build powder component (124); The build powder feeder (222) a build powder first component feeder (226) configured to selectively dispense the build powder first component (122); a build powder second component feeder (228) configured to selectively dispense the build powder second component (124); a mixer (230) coupled to the build powder first component feeder (226) and the build powder second component feeder (228), Mixing together the first component build powder feeder (226) and the second component build powder feeder (228); said build powder (102), Selectively dispensing the build powder (102) into a nozzle (208). a mixer (230) configured as follows: Equipped with the build powder first component feeder (226) comprises a build powder first component regulator (232) configured to selectively control the composition percentage of the build powder first component feeder (226) in the build powder (102) contained in the mixer (230); the build powder second component feeder (228) comprises a build powder second component regulator (234) configured to selectively control the composition percentage of the build powder second component feeder (228) in the build powder (102) contained in the mixer (230); 1. An additive manufacturing system (200) wherein the mixer (230) comprises a mixer regulator (316) configured to selectively control a mass flow rate of the build powder (102) dispensed to the nozzle (208).

6. The powder deposition device (202) is configured to selectively deposit the support powder (104) before the build powder (102) is selectively deposited, so that: a support powder boundary (114) of the support powder section (110) of the powder layer (106) forms the build shape (112); 6. The additive manufacturing system (200) of claim 5, wherein a build powder boundary (116) of the build powder section (108) of the powder layer (106) is adjacent to the support powder boundary (114) of the support powder section (110) of the powder layer (106).

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