Plasma spraying deposition powder feeding device, powder feeding method and deposition equipment

Abstract

This invention provides a plasma spray deposition powder feeding device, a powder feeding method, and a deposition equipment. The plasma spray deposition powder feeding device includes a powder injection pipe and a spray gun. The spray gun is used to spray plasma, and the powder injection pipe has an outlet along the spray path towards the spray gun. The powder injection pipe includes a first bend section and a second bend section arranged sequentially. The first bend section has a first bend start end and a first bend end end, and the second bend section has a second bend start end and a second bend end end. The pipe axis at the first bend start end intersects with the pipe axis at the first bend end, and the pipe axis at the second bend start end intersects with the pipe axis at the second bend end. Compared to the straight pipe design in conventional technology, the plasma spray deposition powder feeding device of this invention, by modifying the pipe structure, can cleverly improve its ability to crush powder materials.

Description

Technical Field

[0001] This invention relates to the field of vapor deposition technology, and more particularly to a plasma spray deposition powder feeding device, powder feeding method, and deposition equipment. Background Technology

[0002] Plasma Spray Physical Vapor Deposition (PS-PVD) is a technique that combines the advantages of traditional atmospheric plasma spraying (APS) and electron beam physical vapor deposition (EB-PVD). It utilizes high-temperature plasma to heat materials to a molten or vaporized state, then sprays the material onto a substrate surface to form a solid coating. PS-PVD evolved from low-pressure plasma spraying by further reducing the vacuum chamber pressure and significantly increasing the power of the plasma spray gun. It can use gas, liquid, and solid phases as deposition units to prepare coatings. By controlling the proportions of the gas / liquid / solid phases, coatings with different microstructures can be deposited. When gas phase deposition is dominant, the resulting quasi-columnar structure coating exhibits excellent thermal insulation and high thermal cycling performance.

[0003] Plasma spray physical vapor deposition (PVD) technology uses powder materials as deposition feedstock. PVD equipment typically employs an internal powder feeding method, including a powder feeder, a powder feeding pipe, and a spray gun. The powder feeder introduces the powder material into the powder feeding pipe and ultimately into the spray gun. After being sprayed from the spray gun, the powder material vaporizes under the influence of the plasma jet. Currently, agglomerated powder materials, formed by the aggregation of multiple original particles, are commonly used as raw materials. Agglomerated powder materials are easier to enter the plasma jet during the feeding process than individual original particles, and they can be broken down into original particles and vaporized within the spray gun and plasma jet. The larger the overall particle size of the agglomerated powder material, the better its flowability. However, larger agglomerated powder materials are more difficult to pulverize and have poorer vaporization performance. Summary of the Invention

[0004] Therefore, it is necessary to provide a plasma spraying deposition powder feeding device that can improve the crushing ability of powder materials, addressing the problems mentioned in the background art.

[0005] The present invention provides a plasma spraying deposition powder feeding device, which includes a powder injection pipe and a spray gun, the spray gun being used to spray plasma, and the powder injection pipe having a discharge port on the spray path toward the spray gun;

[0006] The powder injection pipe includes a first bend section and a second bend section arranged sequentially. The first bend section has a first bend start end and a first bend end end, and the second bend section has a second bend start end and a second bend end end. The pipe axis of the first bend start end intersects with the pipe axis of the first bend end end, and the pipe axis of the second bend start end intersects with the pipe axis of the second bend end end.

[0007] In some embodiments of the present invention, the pipe axial direction at the end of the first bend is the same as the pipe axial direction at the beginning of the second bend.

[0008] In some embodiments of the present invention, the pipe axis at the beginning of the first bend is parallel to the pipe axis at the end of the second bend.

[0009] In some embodiments of the present invention, the bending angle of the powder injection pipe at the first bend is 45°~90°; and / or,

[0010] The bending angle of the powder injection pipe at the second bend is 45°~90°.

[0011] In some embodiments of the present invention, the axis of the first bent segment is a smooth curve; and / or,

[0012] The axis of the second bend is a smooth curve.

[0013] In some embodiments of the present invention, the inner side of the first bend is an arc with a radius of 20mm to 50mm, and the pipe diameter of the first bend is 3mm to 6mm; and / or,

[0014] The inner side of the second bend is an arc with a radius of 20mm to 50mm, and the pipe diameter of the second bend is 3mm to 6mm.

[0015] Furthermore, the present invention also provides a plasma spraying deposition powder feeding method, which includes the following steps:

[0016] The plasma spraying deposition powder feeding device as described in any of the above embodiments is used to transport agglomerated powder material into the powder injection pipe;

[0017] The powder material is ejected from the outlet after passing through the first bending section and the second bending section, and plasma is sprayed toward the agglomerated powder material using the spray gun.

[0018] In some embodiments of the present invention, the D50 particle size of the agglomerated powder material is 20 μm to 25 μm.

[0019] In some embodiments of the present invention, the agglomerated powder material includes primary particles and a binder, wherein the binder accounts for 0.5% to 2% of the mass of the agglomerated powder material.

[0020] In some embodiments of the present invention, the preparation method of the agglomerated powder material includes the following steps:

[0021] The raw materials and binder are mixed and dispersed in a solvent to obtain a mixture with a solid content of 15% to 40%.

[0022] The mixture is subjected to spray granulation treatment. During the spray granulation treatment, the pressure of the compressed gas in the atomizer is controlled to be 0.2MPa~0.6MPa, the inlet temperature of the atomizer is controlled to be 210℃~270℃, and the outlet temperature of the atomizer is controlled to be 110℃~120℃.

[0023] Furthermore, the present invention also provides a plasma spraying deposition apparatus, which includes a deposition chamber and a plasma spraying deposition powder feeding device as described in any of the above embodiments, wherein the spray gun in the plasma spraying deposition powder feeding device is disposed in the deposition chamber.

[0024] The plasma spray deposition powder feeding device of this invention includes a powder injection pipe and a spray gun, wherein the spray gun is used to spray plasma. The powder injection pipe includes a first bend section and a second bend section arranged sequentially. The first bend section has a first bend start end and a first bend end, and the second bend section has a second bend start end and a second bend end. The pipe axis at the first bend start end intersects with the pipe axis at the first bend end, and the pipe axis at the second bend start end intersects with the pipe axis at the second bend end. When the powder material passes through the powder injection pipe, the first and second bend sections change the pipe axis twice, resulting in a more intense collision between the powder material and the injection pipe, causing the powder material to be pre-broken and fragmented within the pipe. The fragmented powder material has a relatively small particle size, making it easier for it to undergo further fragmentation and gasification under the action of plasma after being ejected from the outlet. Therefore, compared to the straight pipe design in traditional technology, the plasma spray deposition powder feeding device of this invention can cleverly improve its ability to break down powder materials by modifying the pipe structure.

[0025] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of a powder injection pipe.

[0028] Figure 2 This is a schematic diagram of another type of powder injection pipe;

[0029] Figure 3 This is a schematic diagram of another type of powder injection pipe;

[0030] Figure 4 This is a schematic diagram of the structure of the agglomerated powder prepared in Example 1;

[0031] Figure 5 This is a schematic diagram of the structure of the agglomerated powder prepared in Example 2.

[0032] The reference numerals and their meanings in the accompanying drawings are as follows:

[0033] 110. First bend segment; 111. Beginning of the first bend; 112. End of the first bend; 120. Second bend segment; 121. Beginning of the second bend; 122. End of the second bend; 130. Transition segment; 210. First bend segment; 211. Beginning of the first bend; 212. End of the first bend; 220. Second bend segment; 221. Beginning of the second bend; 222. End of the second bend; 230. Transition segment; 310. First bend segment; 311. Beginning of the first bend; 312. End of the first bend; 320. Second bend segment; 321. Beginning of the second bend; 322. End of the second bend. Detailed Implementation

[0034] To facilitate understanding of this document, a more comprehensive description will be provided below. Preferred embodiments are given herein. However, this document can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the content of this document more thorough and comprehensive.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this document belongs. The terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the document.

[0036] It should be understood that when an element or layer is referred to as "on," "adjacent to," "connected to," or "coupled to" other elements or layers, it may be directly on, adjacent to, connected to, or coupled to other elements or layers, or there may be intervening elements or layers. Conversely, when an element is referred to as "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc., may be used to describe various elements, components, areas, layers, and / or parts, these elements, components, areas, layers, and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, area, layer, or part from another element, component, area, layer, or part.

[0037] Spatial relation terms such as “below,” “under,” “below,” “below,” “above,” “above,” etc., are used herein for convenience of description to describe the relationship of one element or feature to other elements or features. It should be understood that spatial relation terms are intended to also include different orientations of the device in use and operation. For example, if the device in the figures is flipped, then the element or feature described as “below,” “below,” or “below” other elements or features will be oriented “above” other elements or features. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. Devices may be oriented in other ways (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used will be interpreted accordingly.

[0038] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. When used herein, the singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprise” and / or “comprising,” when used in this specification, identify the presence of features, integers, steps, operations, elements, and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0039] This invention provides a plasma spray deposition powder feeding device, which includes a powder injection pipe and a spray gun. The spray gun is used to spray plasma, and the powder injection pipe has an outlet on the spray path toward the spray gun. The powder injection pipe includes a first bend section and a second bend section arranged sequentially. The first bend section has a first bend start end and a first bend end end, and the second bend section has a second bend start end and a second bend end end. The pipe axis of the first bend start end intersects the pipe axis of the first bend end end, and the pipe axis of the second bend start end intersects the pipe axis of the second bend end end.

[0040] The plasma spray deposition powder feeding device of this invention includes a powder injection pipe and a spray gun, wherein the spray gun is used to spray plasma. The powder injection pipe includes a first bend section and a second bend section arranged sequentially. The first bend section has a first bend start end and a first bend end, and the second bend section has a second bend start end and a second bend end. The pipe axis at the first bend start end intersects with the pipe axis at the first bend end, and the pipe axis at the second bend start end intersects with the pipe axis at the second bend end. When the powder material passes through the powder injection pipe, the first and second bend sections change the pipe axis twice, resulting in a more intense collision between the powder material and the injection pipe, causing the powder material to be pre-broken and fragmented within the pipe. The fragmented powder material has a relatively small particle size, making it easier for it to undergo further fragmentation and gasification under the action of plasma after being ejected from the outlet. Therefore, compared to the straight pipe design in traditional technology, the plasma spray deposition powder feeding device of this invention can cleverly improve its ability to break down powder materials by modifying the pipe structure.

[0041] Figure 1 This is a schematic diagram of a powder injection pipe. The plasma spraying deposition powder feeding device of the present invention may include a spray gun and, as shown in the schematic diagram, a powder injection pipe. Figure 1 The powder injection pipe shown has an outlet on the injection path toward the spray gun, where the spray gun is used to spray plasma.

[0042] In some examples of this embodiment, the plasma spraying deposition powder feeding device of the present invention may further include a powder feeder connected to a powder injection pipe, and the powder feeder is used to transport powder material into the powder injection pipe.

[0043] Reference Figure 1 As shown, in this embodiment, the powder injection pipe includes a first bend section 110 and a second bend section 120 arranged sequentially. The first bend section 110 has a first bend start end 111 and a first bend end end 112. The second bend section 120 has a second bend start end 121 and a second bend end end 122. The pipe axis of the first bend start end 111 intersects with the pipe axis of the first bend end end 112, and the pipe axis of the second bend start end 121 intersects with the pipe axis of the second bend end end 122.

[0044] It is understandable that powder injection pipes have an axial direction, and for straight pipes, this axial direction remains fixed. In cases such as... Figure 1 In the powder injection pipe shown, the pipe's axial direction changes at the first bend 110, causing the pipe's axial direction at the beginning of the first bend 111 to intersect with the pipe's axial direction at the end of the first bend 112. The pipe's axial direction also changes at the second bend 120, causing the pipe's axial direction at the beginning of the second bend 121 to intersect with the pipe's axial direction at the end of the second bend 122.

[0045] In practical use, the powder material can move along the airflow in the powder injection pipe. The axial direction of the powder injection pipe before the first bend 110 remains fixed, thus allowing the powder material to move stably along the axial direction. Upon passing through the first bend 110 and the second bend 120, due to the two consecutive changes in the pipe's axial direction, the movement path of the powder material deviates from the pipe's axial direction and collides multiple times with the pipe wall. During these collisions, the weaker bonds are preferentially broken, enabling the particle size of the powder material to be reduced within the pipe without the need for external equipment.

[0046] Reference Figure 1 As shown, in this embodiment, the powder injection pipe has only two bends. In other examples, the powder injection pipe may include more bends. However, too many bends will also lead to too many collisions between the powder material and the pipe wall, resulting in a significant reduction in its flowability, which is not conducive to its ejection.

[0047] Reference Figure 1 As shown, in some examples of this embodiment, the pipe axis of the first bend end 112 is the same as the pipe axis of the second bend beginning 121. Designing the pipe axis of the first bend end 112 to be the same as the pipe axis of the second bend beginning 121 allows the powder material to enter the second bend more smoothly from the first bend, maintaining relatively good flowability of the powder material.

[0048] Reference Figure 1 As shown, in some examples of this embodiment, the pipe axis of the first bend start 111 is parallel to the pipe axis of the second bend end 122. Setting the pipe axis of the first bend start 111 and the pipe axis of the second bend end 122 to be parallel can also minimize the energy loss when the powder material collides with the pipe wall, and further maintain the relatively good flowability of the powder material.

[0049] Reference Figure 1 As shown, in some examples of this embodiment, in the powder injection pipe, the axial direction of the portion of the powder injection pipe located before the first bend beginning 111 is kept fixed and is the same as the axial direction of the pipe at the first bend beginning 111.

[0050] Reference Figure 1 As shown, in some examples of this embodiment, in the powder injection pipe, the pipe axis of the portion of the powder injection pipe located after the second bend end 122 is also kept fixed and is the same as the pipe axis of the second bend end 122.

[0051] Reference Figure 1As shown, in some examples of this embodiment, the bending angle of the powder injection pipe at the first bend 110 is 45°~90°. The bending angle refers to the angle between the pipe axial direction at the first bend beginning 111 and the pipe axial direction at the first bend end 112. By setting the bending angle to 45°~90°, the powder material passing through can be effectively broken up, while also ensuring good flowability of the powder material.

[0052] In some examples of this embodiment, the bending angle of the powder injection pipe at the first bend 110 can be 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, or 90°. Alternatively, the bending angle of the powder injection pipe at the first bend 110 can also be within the range of any two of the above bending angles.

[0053] Reference Figure 1 As shown, in some examples of this embodiment, the bending angle of the powder injection pipe at the second bend 120 is 45°~90°, where the bending angle refers to the angle between the pipe axis at the beginning of the second bend 121 and the pipe axis at the end of the second bend 122.

[0054] In some examples of this embodiment, the bending angle of the powder injection pipe at the second bend 120 can be 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, or 90°. Alternatively, the bending angle of the powder injection pipe at the second bend 120 can also be within the range of any two of the above bending angles.

[0055] In some examples of this embodiment, the axis of the first bend segment 110 may be a smooth curve. For example, the axis of the first bend segment 110 may be an arc.

[0056] In some examples of this embodiment, the axis of the second bend segment 120 may be a smooth curve. For example, the axis of the second bend segment 120 may be an arc.

[0057] By setting the axis of the first bending section 110 and the axis of the second bending section 120 to be in a smooth curve, it can be ensured that the powder material can continue to move forward after the first bending section 110 and the second bending section 120 collide with the pipe wall, thereby enabling the powder material to maintain a high flow rate.

[0058] It is understood that, since the axis of the first bending segment 110 is curved, the first bending segment 110 has an inner side located within the axis and an outer side located outside the axis, wherein the length of the inner side is shorter than the length of the outer side. In some examples of this embodiment, the inner side of the first bending segment 110 is an arc with a radius of 20mm to 50mm. For example, the radius of the inner side of the first bending segment 110 can be 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, or 50mm, or the radius of the inner side of the first bending segment 110 can be between any two of the above radii.

[0059] In some examples of this embodiment, the pipe diameter of the first bend section 110 is 3mm to 6mm. For example, the pipe diameter of the first bend section 110 is 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, or 6mm, or the pipe diameter of the first bend section 110 may be between any two of the above diameters.

[0060] It is understood that, since the axis of the second bending segment 120 is curved, the second bending segment 120 has an inner side located within the axis and an outer side located outside the axis, wherein the length of the inner side is shorter than the length of the outer side. In some examples of this embodiment, the inner side of the second bending segment 120 is an arc with a radius of 20mm to 50mm. For example, the radius of the inner side of the second bending segment 120 can be 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, or 50mm, or the radius of the inner side of the second bending segment 120 can be between any two of the above radii.

[0061] In some examples of this embodiment, the pipe diameter of the second bend section 120 is 3mm to 6mm. For example, the pipe diameter of the second bend section 120 is 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, or 6mm, or the pipe diameter of the second bend section 120 may be between any two of the above diameters.

[0062] In such Figure 1 In the example shown, the pipe axis at the first bend is parallel to the pipe axis at the second bend end 122. Furthermore, along the direction from the first bend segment 110 to the second bend segment 120, the pipe axis at the first bend is the same as the pipe axis at the second bend end 122. For example... Figure 1 As shown, the axial direction of the pipe at the first bend and the axial direction of the pipe at the second bend are both to the right.

[0063] In such Figure 1In the example shown, the first bend end 112 and the second bend beginning 121 are spaced apart. The powder injection pipe also includes a transition section 130 located between the first bend end 112 and the second bend beginning 121. The transition section 130 can be straight to maintain the pipe's axial direction. It is understood that in other examples, the first bend end 112 can be directly connected to the second bend beginning 121, that is, the first bend section 110 and the second bend section 120 are directly connected, and the boundary between the first bend section 110 and the second bend section 120 serves as both the first bend end 112 and the second bend beginning 121.

[0064] Figure 2 This is a schematic diagram of another type of powder injection pipe. (Refer to...) Figure 2 As shown, the powder injection pipe includes a first bend section 210 and a second bend section 220 arranged sequentially. The first bend section 210 has a first bend start end 211 and a first bend end end 212. The second bend section 220 has a second bend start end 221 and a second bend end end 222. The pipe axis of the first bend start end 211 intersects with the pipe axis of the first bend end end 212, and the pipe axis of the second bend start end 221 intersects with the pipe axis of the second bend end end 222.

[0065] In such Figure 2 In the example shown, the pipe axis at the first bend is parallel to the pipe axis at the second bend end 222. Furthermore, along the direction from the first bend segment 210 to the second bend segment 220, the pipe axis at the first bend is opposite to the pipe axis at the second bend end 222. For example... Figure 2 As shown, the pipe at the beginning of the first bend is axially oriented to the right, while the pipe at the end of the second bend 222 is axially oriented to the left.

[0066] In such Figure 2 In the example shown, the first bend end 212 and the second bend beginning 221 are spaced apart. The powder injection pipe also includes a transition section 230 located between the first bend end 212 and the second bend beginning 221. The transition section 230 can be straight to maintain the pipe's axial direction. It is understood that in other examples, the first bend end 212 can be directly connected to the second bend beginning 221, that is, the first bend section 210 and the second bend section 220 are directly connected, and the boundary between the first bend section 210 and the second bend section 220 serves as both the first bend end 212 and the second bend beginning 221.

[0067] Figure 2 The powder injection pipe shown is Figure 1 The main difference between the powder injection pipes shown lies in the orientation design of the first bend section 210 and the second bend section 220. Other structural parameters can be found by referring to [reference needed]. Figure 1The corresponding structural parameters of the powder injection pipe shown.

[0068] Figure 3 This is a schematic diagram of another type of powder injection pipe. (Refer to...) Figure 3 As shown, the powder injection pipe includes a first bend section 310 and a second bend section 320 arranged sequentially. The first bend section 310 has a first bend start end 311 and a first bend end end 312. The second bend section 320 has a second bend start end 321 and a second bend end end 322. The pipe axis of the first bend start end 311 intersects with the pipe axis of the first bend end end 312, and the pipe axis of the second bend start end 321 intersects with the pipe axis of the second bend end end 322.

[0069] In such Figure 3 In the example shown, the pipe axis at the first bend is parallel to the pipe axis at the second bend end 322. Furthermore, along the direction from the first bend segment 310 to the second bend segment 320, the pipe axis at the first bend is opposite to the pipe axis at the second bend end 322. For example... Figure 3 As shown, the pipe at the beginning of the first bend is axially oriented to the right, while the pipe at the end of the second bend 322 is axially oriented to the left.

[0070] In such Figure 3 In the example shown, the first bend end 312 is directly connected to the second bend beginning 321, that is, the first bend segment 310 and the second bend segment 320 are directly connected, and the boundary between the first bend segment 310 and the second bend segment 320 serves as both the first bend end 312 and the second bend beginning 321.

[0071] Figure 3 The powder injection pipe shown is Figure 2 The main difference between the powder injection pipes shown is that the first bend section 310 and the second bend section 320 are directly connected. Other structural parameters can be found by referring to [reference needed]. Figure 2 The corresponding structural parameters of the powder injection pipe shown.

[0072] Furthermore, the present invention also provides a plasma spraying deposition powder feeding method, which includes the following steps: using a plasma spraying deposition powder feeding device as described in the above embodiment, conveying agglomerated powder material into a powder injection pipe; and, after the powder material passes through a first bending section and a second bending section, ejecting it from a discharge port, and spraying plasma towards the agglomerated powder material using a spray gun.

[0073] During the process of passing through the first and second bending sections, the agglomerated powder material collides with the tube wall due to the change in axial direction, which is equivalent to a crushing process. This can reduce the overall particle size of the agglomerated powder material and make the agglomerated powder material flowing out of the outlet more easily crushed and gasified in the plasma jet.

[0074] Traditional powder injection pipes use a straight pipe design and typically only employ agglomerated powder materials with a D50 particle size of 10μm-12μm. When the particle size is too small, the flowability is poor; when the particle size is too large, it is difficult to be fully vaporized by the plasma jet. The plasma spraying deposition powder delivery method of this invention is particularly suitable for larger agglomerated powder materials.

[0075] In some examples of this embodiment, the D50 particle size of the agglomerated powder material is 20 μm to 25 μm. The agglomerated powder material with a D50 particle size of 20 μm to 25 μm has significantly better flowability, and it breaks down in the powder injection pipe, thus reducing the overall particle size. The overall particle size of the agglomerated powder material flowing out of the discharge port is also relatively small, which allows it to be more fully vaporized in the plasma jet.

[0076] In some examples of this embodiment, the agglomerated powder material includes primary particles and a binder, with the binder accounting for 0.5% to 2% of the mass of the agglomerated powder material. Primary particles refer to the smallest particles that make up the agglomerated powder material. Multiple primary particles are bound together by the binder and their own van der Waals forces to form the agglomerated powder material. Upon impact, the agglomerated powder material can break apart and form multiple separate primary particles. By using a binder accounting for 0.5% to 2% of the mass, the bonding strength of the agglomerated powder material can be better matched to the plasma spray deposition powder feeding device of this invention, allowing the agglomerated powder material to undergo more thorough breakup.

[0077] In some examples of this embodiment, the mass percentage of the binder in the agglomerated powder material can be 0.5%, 0.7%, 0.9%, 1%, 1.2%, 1.4%, 1.5%, 1.6%, 1.8%, or 2%, or the mass percentage of the binder in the agglomerated powder material can be controlled between any two of the above mass percentages.

[0078] In some examples of this embodiment, the agglomerated powder material may also include other components, such as dispersants. During the preparation of the agglomerated powder material, dispersants enable more uniform and thorough mixing between the primary particles and the binder. The dispersant may be selected from surfactants.

[0079] In some examples of this embodiment, the preparation method of the agglomerated powder material may include the following steps: mixing and dispersing primary particles and a binder in a solvent to obtain a mixture, wherein the solid content of the mixture is 15% to 40%. And, spray granulation treatment is then performed on the mixture. The amounts of primary particles and binder can be determined by the amounts of the corresponding components in the agglomerated powder material to be prepared.

[0080] In some examples of this embodiment, during the spray granulation process, the pressure of the compressed gas in the atomizer is controlled to be 0.2 MPa to 0.6 MPa, the inlet temperature of the atomizer is controlled to be 210°C to 270°C, and the outlet temperature of the atomizer is controlled to be 110°C to 120°C.

[0081] In some examples of this embodiment, a peristaltic pump is also required to feed the material during the spray granulation process. The speed of the peristaltic pump can be 33 rpm to 40 rpm.

[0082] In some examples of this embodiment, the step of mixing and dispersing the primary particles and the binder in a solvent may also include the step of adding a dispersant, which is used to make the primary particles and the binder mix more thoroughly.

[0083] In some examples of this embodiment, a ball milling step may also be included to form a homogeneous slurry. The ball milling time can be 2 hours to 12 hours. The ball milling method can be a drum ball mill.

[0084] The above preparation process can produce agglomerated powder materials with suitable particle size and bonding strength.

[0085] Furthermore, the present invention also provides a plasma spraying deposition apparatus. This plasma spraying deposition apparatus includes a deposition chamber and a plasma spraying deposition powder feeding device as described in the above embodiment, wherein the spray gun in the plasma spraying deposition powder feeding device is disposed within the deposition chamber.

[0086] It should be understood that the use of directional terms such as "front" and "rear" in the description of the powder injection pipe, with the first bend section located before the second bend section, is merely for the purpose of illustrating the structure of the various parts of the powder injection pipe and does not imply a limitation on the direction of movement of the powder material within the pipe. In actual use of this powder injection pipe, the powder material can also move in the direction from the second bend section toward the first bend section, depending on the location of the outlet, which will not be elaborated upon here.

[0087] To facilitate understanding of the technical solution of the present invention, more specific embodiments are provided below. Through the description of the embodiments, the specific implementation of the present invention will be easier to understand, and the advantages of the present invention will also be more obvious.

[0088] Example 1

[0089] Yttrium-stabilized zirconia (YSZ) particles are provided as primary particles, polyacrylamide is used as a binder, and polyvinyl alcohol is used as a dispersant. The yttrium-stabilized zirconia particles are mixed with the binder and dispersant in a solvent to obtain a mixture with a solid content of 20%, of which the dispersant content is 0.5% and the binder content is 1%.

[0090] The mixture was ball-milled for 4 hours to form a slurry.

[0091] The slurry was placed in an atomizer, with the inlet temperature set to 210℃ and the outlet temperature to 110℃, and spray granulation was performed to obtain agglomerated powder material with a D50 particle size of 24μm. The morphology of the agglomerated powder material can be seen in... Figure 4 .

[0092] The agglomerated powder material is fed into the powder injection pipe through a feeder. The powder injection pipe has a device installed in the middle of a straight section, such as... Figure 1 The first and second bends shown are both 1 / 4 circular arcs, with an inner radius of 35 mm and an inner diameter of 5 mm.

[0093] Plasma is sprayed using a spray gun. Agglomerated powder material flows out of the outlet and enters the plasma center. After vaporization, it is deposited on the substrate with a deposition efficiency of 25.62 μm / min.

[0094] Example 2

[0095] Yttrium-doped gadolinium zirconate (GYbz) particles are provided as primary particles, polyacrylamide is used as a binder, and polyvinyl alcohol is used as a dispersant. The yttrium-stabilized zirconium oxide particles are mixed with the binder and dispersant in a solvent to obtain a mixture with a solid content of 20%. The solid component contains 0.04% dispersant and 0.7% binder.

[0096] The mixture was ball-milled for 4 hours to form a slurry.

[0097] The slurry was placed in an atomizer with an inlet temperature of 270℃, an outlet temperature of 120℃, and a compressed air pressure of 0.4MPa for spray granulation, resulting in agglomerated powder material with a D50 particle size of 22μm. The morphology of the agglomerated powder material can be seen in... Figure 5 .

[0098] The agglomerated powder material is fed into the powder injection pipe through a feeder. The powder injection pipe has a device installed in the middle of a straight section, such as... Figure 2The first and second bends shown are both 1 / 4 arc-shaped, with an inner radius of 35mm and an inner diameter of 5mm.

[0099] Plasma is jetted using a spray gun. Agglomerated powder material flows out of the outlet and enters the plasma center. After vaporization, it is deposited on the substrate with a deposition efficiency of 26.447 μm / min.

[0100] Please note that the above embodiments are for illustrative purposes only and are not intended to limit the scope of this document.

[0101] It should be understood that, unless otherwise expressly stated herein, there is no strict order in which the steps are performed, and these steps may be performed in other orders. Moreover, at least some steps in the preparation process may include multiple sub-steps or multiple stages, which are not necessarily completed at the same time, but may be performed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but may be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0102] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0103] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A plasma spray deposition powder feeding method, characterized in that, A plasma spraying deposition powder feeding device is adopted. The plasma spraying deposition powder feeding device includes a powder injection pipe and a spray gun. The spray gun is used to spray plasma. The powder injection pipe is only provided with two bends. The powder injection pipe is provided with a first bend section, a transition section, and a second bend section in sequence. The first bend section has a first bend start end and a first bend end end, and the second bend section has a second bend start end and a second bend end end. The pipe axis of the first bend start end intersects the pipe axis of the first bend end end, and the pipe axis of the second bend start end intersects the pipe axis of the second bend end end. The transition section is located between the first bend end end end and the second bend start end end, and the transition section is straight to keep the pipe axis unchanged. The axis of the first bend is a smooth curve, and the axis of the second bend is a smooth curve; the pipe axis at the end of the first bend is the same as the pipe axis at the beginning of the second bend; the pipe axis at the beginning of the first bend is parallel to the pipe axis at the end of the second bend. The inner side of the first bend is an arc with a radius of 20mm to 50mm, and the pipe diameter of the first bend is 3mm to 6mm; the inner side of the second bend is an arc with a radius of 20mm to 50mm, and the pipe diameter of the second bend is 3mm to 6mm. The plasma spraying deposition powder feeding method includes the following steps: Conveying agglomerated powder material into the powder injection pipe; and, The agglomerated powder material is ejected from the outlet after passing through the first bending section and the second bending section. The powder injection pipe has an outlet on the spray path toward the spray gun, and plasma is sprayed toward the agglomerated powder material using the spray gun. The D50 particle size of the agglomerated powder material is 20μm~25μm.

2. The plasma spraying deposition powder feeding method according to claim 1, characterized in that, The bending angle of the powder injection pipe at the first bend is 45°~90°.

3. The plasma spraying deposition powder feeding method according to claim 1, characterized in that, The bending angle of the powder injection pipe at the second bend is 45°~90°.

4. The plasma spraying deposition powder feeding method according to claim 1, characterized in that, The agglomerated powder material includes primary particles and a binder, wherein the binder accounts for 0.5% to 2% of the mass of the agglomerated powder material.

5. The plasma spraying deposition powder feeding method according to any one of claims 1 to 4, characterized in that, The preparation method of the agglomerated powder material includes the following steps: Primary particles and binder are mixed and dispersed in a solvent to obtain a mixture with a solid content of 15% to 40%. The mixture is subjected to spray granulation treatment. During the spray granulation treatment, the pressure of the compressed gas in the atomizer is controlled to be 0.2MPa~0.6MPa, the inlet temperature of the atomizer is controlled to be 210℃~270℃, and the outlet temperature of the atomizer is controlled to be 110℃~120℃.

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