Method and equipment for forming directionally-arranged resin-based diamond composite heat-conducting material

Abstract

The invention relates to a method and equipment for forming a directionally-arranged resin-based diamond composite heat-conducting material. The method comprises the following steps: step 1, adding light-cured resin slurry with magnetic loaded monocrystal diamond particles into a container; 2, applying a uniform magnetic field to the slurry in the container to directionally arrange the slurry, wherein the magnetic field intensity is adjusted according to the properties and the proportion of materials in the slurry; 3, laser is introduced into the container, so that the directionally-arranged slurry is solidified layer by layer to form a composite component; and fourthly, the composite component is taken out and subjected to secondary curing. According to the invention, the magnetic field orientation technology and the photocuring molding technology are combined, so that the production of the monocrystal diamond / polymer-based composite material does not need to depend on a mold, the processing quality is easy to control, and the production difficulty of complex components and personalized components is reduced; and meanwhile, the applied uniform magnetic field can adjust the properties and the proportion of the materials in the slurry, so that the magnetic loaded monocrystal diamond can achieve the optimal arrangement effect.

Description

Technical Field

[0001] The present application relates to the field of 3D printing technology, and in particular to a method and device for molding a directional resin-based diamond composite thermal conductive material. Background Art

[0002] With the continuous miniaturization, density, high frequency and functionalization of electronic components, hot spots and redundant heat problems in electronic devices have become increasingly prominent. Single crystal diamond / polymer-based composite materials are widely used in electronic packaging materials due to their strong thermal conductivity, insulation and easy processing.

[0003] At present, the production of directional single-crystal diamond / polymer-based composite materials relies on molds, which have low molding efficiency, low modeling complexity and difficulty in personalized customization. However, UV-curing 3D printing technology has been maturely applied to a variety of resin materials, with the advantages of fast processing operation, free modeling and convenient customized production. How to use it in the production of directional single-crystal diamond / polymer-based composite materials, thereby improving the production efficiency of directional single-crystal diamond / polymer-based composite materials and reducing the difficulty of production has guiding significance. Summary of the invention

[0004] Based on this, it is necessary to provide a directional arrangement molding device and a molding method based on photocuring and magnetic field to overcome the defects mentioned in the above background technology.

[0005] A method for molding a directional resin-based diamond composite thermal conductive material comprises the following steps: Step 1: Adding magnetically loaded single crystal diamond particles light-cured resin slurry into a container; Step 2: applying a uniform magnetic field to the slurry in the container to orient the slurry, and the magnetic field strength is adjusted according to the properties and proportions of the materials in the slurry; Step 3: Introduce laser into the container to solidify the oriented slurry layer by layer to form a composite component; Step 4: Take out the composite component and perform secondary curing.

[0006] As a preferred method for forming a directional resin-based diamond composite thermal conductive material in the present invention, in the step 2, the magnetic field strength is adjusted according to the properties and proportions of the materials in the slurry, specifically including: If the slurry is standard slurry, the magnetic field strength is adjusted to 80MT; If the magnetic load of the single crystal diamond in the slurry is less than that of the single crystal diamond in the standard slurry and the resin viscosity is greater than that of the resin in the standard slurry, the magnetic field strength should be greater than 80MT; If the magnetic load of the single crystal diamond in the slurry is greater than the magnetic load of the single crystal diamond in the standard slurry and the resin viscosity is less than the resin viscosity in the standard slurry, the magnetic field strength should be less than 80MT.

[0007] As a preferred method for molding a directional resin-based diamond composite thermal conductive material in the present invention, the mass ratio of diamond to magnetic iron oxide in the magnetically loaded single crystal diamond in the standard slurry is 8:1, and the viscosity of the resin is medium.

[0008] A device for realizing the above-mentioned directional arrangement resin-based diamond composite thermal conductive material molding method, comprising a frame, on which is provided: Material pool; Electromagnets, which are arranged on both sides of the material pool; A galvanometer, which is arranged below the material pool; A guide rail assembly is arranged at one end of the material pool; The forming plate is arranged above the material pool and is connected to the guide rail assembly through an adjustable fixing column.

[0009] As a preferred embodiment of the device of the present invention, an opening is provided at a position corresponding to the output end of the frame and the galvanometer.

[0010] As a preferred embodiment of the equipment of the present invention, a laser transparent window is provided at a position corresponding to the opening at the bottom of the material pool.

[0011] As a preferred embodiment of the equipment in the present invention, the guide rail assembly includes a guide rail frame and a forming plate frame, one end of the forming plate is slidably connected to the guide rail frame, and it can reciprocate along the vertical direction of the material pool under the drive of the guide rail frame, and the other end of the forming plate extends above the material pool.

[0012] As a preferred embodiment of the equipment of the present invention, the frame, material pool, forming plate frame and forming plate are all made of non-ferromagnetic materials.

[0013] As a preferred embodiment of the equipment of the present invention, the feeding end of the forming plate is provided with coating and texture.

[0014] As a preferred embodiment of the device of the present invention, the magnetic poles of the electromagnets at both ends of the material pool are in the same direction.

[0015] Beneficial effects of the present invention: The present invention combines magnetic field orientation technology with photocuring molding technology. By applying a uniform magnetic field to the photocuring resin slurry of magnetically loaded single crystal diamond particles, the magnetically loaded single crystal diamond in the slurry can be arranged in a directional manner. Then, by irradiating the slurry with a laser, the resin therein is induced to solidify layer by layer to form a composite component, so that the production of single crystal diamond / polymer-based composite materials no longer needs to rely on molds and the processing quality is easy to control, which can effectively improve production efficiency and reduce the difficulty of producing complex components and personalized components. At the same time, the uniform magnetic field applied can adjust the properties and proportions of the materials in the slurry to ensure that the magnetically loaded single crystal diamond can achieve the best arrangement effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the process of the molding method in the embodiment of the present application; Figure 2 This is a schematic diagram of the structure of the device in the embodiment of the present application; Figure 3 This is a schematic diagram of the working principle of the device in the embodiment of the present application; Description of reference numerals: 1. Guide rail frame; 2. Rack; 3. Forming flat rack; 4. Ball screw; 5. Forming plate; 6. Electromagnet mounting bracket; 7. Electromagnet; 8. Material pool; 9. Galvanometer; 10. Composite components; 11. Magnetic loaded single crystal diamond particles photocurable resin slurry. DETAILED DESCRIPTION

[0018] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0019] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0020] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0021] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0022] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0023] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0024] Example This embodiment provides a method for forming a directional resin-based diamond composite thermal conductive material. Figure 1 As shown, the following steps are included: Adding magnetically loaded single crystal diamond particles light-cured resin slurry into the container; A uniform magnetic field is applied from both sides of the container to the bottom of the container to orient the magnetically loaded single crystal diamond particles in the slurry within the uniform magnetic field, and the magnetic field strength is adjusted according to the properties and proportions of the materials in the slurry; A laser is introduced into the container from the bottom of the container, and the laser irradiates the slurry after the orientation arrangement, so that the resin in the slurry is solidified layer by layer to form a composite component; The composite component is removed and subjected to secondary curing.

[0025] This embodiment also provides a device for implementing the above-mentioned method for molding the directional resin-based diamond composite thermal conductive material. Figure 2 As shown, it includes a frame 2, on which a material pool 8, an electromagnet 7, a galvanometer 9, a guide rail assembly and a forming plate 5 fixed on the guide rail assembly are fixed.

[0026] The frame 2 includes a first limb plate and a second limb plate which are perpendicular to each other, and a diagonal brace is provided between the first limb plate and the second limb plate to enhance the structural strength and stability.

[0027] The material pool 8 is arranged at the center of the top of the first limb plate.

[0028] The electromagnets 7 are arranged on both sides of the material pool 8 and connected to the first limb plate through the electromagnet mounting frame 6. The magnetic poles of the electromagnets 7 at both ends of the material pool 8 are in the same direction so as to form a uniform magnetic field.

[0029] The galvanometer 9 is arranged directly below the material pool 8 and its output end faces the material pool 8 , and one side of the galvanometer 9 is connected to the second limb plate.

[0030] The guide rail assembly is arranged at one end of the material pool 8, and its lower part is connected to the second limb plate.

[0031] The forming plate 5 is arranged above the material pool 8 and is connected to the guide rail assembly through an adjustable fixing column.

[0032] In this embodiment, an opening adapted to the bottom of the pool 8 is provided at a position corresponding to the output end of the first limb plate and the galvanometer 9, and a laser window is provided at a position corresponding to the opening at the bottom of the pool 8, and the window is made of quartz glass. The laser emitted by the galvanometer 9 can pass through the opening and the quartz glass window to induce a curing reaction of the resin at the bottom of the pool 8.

[0033] In this embodiment, the guide rail assembly includes a guide rail frame 1 and a forming plate frame 3. The guide rail frame 1 is perpendicular to the top surface of the first limb plate, and its side section near the material pool 8 is U-shaped. Linear guide rails are provided at opposite ends of the inner side of the guide rail frame 1, and a ball screw 4 with a driving device is provided in the middle of a pair of linear guide rails. A ball screw slider matching the ball screw 4 is provided at one end of the forming plate frame 3, and sliders matching the linear guide are also provided at both ends of the end. The other end of the forming plate frame 3 extends above the material pool 8, and the driving device drives the ball screw 4 to rotate, thereby driving the forming plate frame 3 to reciprocate along the vertical direction of the material pool 8.

[0034] In this embodiment, the forming plate 5 is connected to the bottom of the other end of the forming plate frame 3 by an adjustable fixation. This structure facilitates leveling of the forming plate 5 to make it parallel to the bottom surface of the material pool 8 to avoid defects at the end of the finished product.

[0035] In this embodiment, the frame 2, material pool 8, forming plate frame 3, forming plate 5 and auxiliary parts used by them such as screws, gaskets, etc. are all made of non-ferromagnetic materials to avoid adverse effects on the magnetic field at the bottom of the material pool 8.

[0036] In this embodiment, the feeding end of the forming plate 5 is provided with coating and texture, the coating is a polytetrafluoroethylene film, and the texture is a diamond mesh, which facilitates the composite component 10 to adhere to the lower surface of the forming plate 5 during forming and to be separated from the forming plate 5 after the forming is completed.

[0037] like Figure 3 As shown, the working principle of the device is as follows: The electromagnet 7 is energized to generate a uniform magnetic field near the bottom of the material pool 8, so that the magnetically loaded single crystal diamond particles in the magnetically loaded single crystal diamond particle photocurable resin slurry 11 are oriented along the magnetic field; the galvanometer 9 works to pass the ultraviolet laser spot through the opening on the frame 2, and irradiate the magnetically loaded single crystal diamond particle photocurable resin slurry 11 through the quartz glass at the bottom of the material pool 8, thereby inducing the resin component therein to cure and form a composite component 10.

[0038] The ball screw 4 rotates under the drive of the servo motor, so that the forming plate frame 3 drives the forming plate 5 to drive the composite component 10 to move upward by one layer height, and the lower surface of the composite component 10 is separated from the bottom surface of the material pool 8. The magnetically loaded single crystal diamond particle photocurable resin slurry 11 will fill the gap left by the separation of the lower surface of the composite component 10 and the bottom surface of the material pool 8 due to its fluidity, so as to carry out scanning and curing of the next layer.

[0039] The method for using the above device comprises the following steps: S1: Add the configured magnetically loaded single crystal diamond particle photocuring resin slurry 11 into the material pool 8, the amount of slurry added is about three quarters of the volume of the material pool 8 to avoid overflow during operation.

[0040] S2: Start the electromagnet 7 and adjust the magnetic field strength according to the properties and proportion of the materials in the slurry to generate a uniform magnetic field at the bottom of the material pool 8. The specific adjustment steps are as follows: If the slurry is standard slurry, the magnetic field strength is adjusted to 80MT, which is the optimal magnetic field strength; If the magnetic load of the single crystal diamond in the slurry is less than that of the single crystal diamond in the standard slurry and the resin viscosity is greater than that of the resin in the standard slurry, the magnetic field strength should be greater than 80MT to ensure that the magnetically loaded single crystal diamond can be oriented; If the magnetic load of the single crystal diamond in the slurry is greater than that in the standard slurry and the resin viscosity is less than that in the standard slurry, the magnetic field strength should be less than 80 MT to ensure that the magnetically loaded single crystal diamond can be arranged in a directional manner.

[0041] S3: Control the ball screw 4 to rotate, driving the forming plate frame 3 to move downward until the material end of the forming plate 5 is one printing layer away from the bottom of the material pool 8. The height of the printing layer can be adjusted according to demand, and the commonly used range is 0.05-0.2 mm.

[0042] S4: An ultraviolet laser with a wavelength of 395 nm is irradiated from the outside into the light inlet of the galvanometer 9 , and the galvanometer 9 is controlled to make the light spot scan the pattern of the current layer of the composite component 10 at the bottom of the material pool 8 .

[0043] S5: Control the ball screw 4 to rotate, driving the forming plate frame 3 and the forming plate 5 to move upward by one printing layer height.

[0044] S6: Repeat S4 and S5 until the scanning of the last layer is completed to obtain a complete composite component 10.

[0045] S7: Turn off the electromagnet 7, control the ball screw 4 to rotate, drive the forming plate frame 3 and the forming plate 5 to move upward to the highest position, and remove the composite component 10 from the lower surface of the forming plate 5.

[0046] S8: Put the composite component 10 removed in S7 into a cleaning machine and clean it with anhydrous ethanol for 5 minutes to wash away the surface slurry.

[0047] S9: putting the composite component 10 cleaned in S8 into a UV light box, irradiating it with UV light with a wavelength of 395 nm for 20 minutes for secondary curing, and finally obtaining a usable composite component 10.

[0048] In this embodiment, the slurry is changed with the properties of the single crystal diamond and the resin therein. In the standard slurry obtained by proportioning, the mass ratio of diamond to magnetic iron oxide of the magnetically loaded single crystal diamond is 8:1, and the viscosity of the resin is medium.

[0049] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0050] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A method for forming a directional resin-based diamond composite thermal conductive material, characterized in that: The steps include: Step 1: Adding magnetically loaded single crystal diamond particles light-cured resin slurry into a container; Step 2: applying a uniform magnetic field to the slurry in the container to orient the slurry, and the magnetic field strength is adjusted according to the properties and proportions of the materials in the slurry; Step 3: Introduce laser into the container to solidify the oriented slurry layer by layer to form a composite component; Step 4: Take out the composite component and perform secondary curing.

2. The method for forming a directional resin-based diamond composite thermal conductive material according to claim 1, characterized in that: In the step 2, the magnetic field strength is adjusted according to the properties and proportions of the materials in the slurry, specifically including: If the slurry is standard slurry, the magnetic field strength is adjusted to 80MT; If the magnetic load of the single crystal diamond in the slurry is less than that of the single crystal diamond in the standard slurry and the resin viscosity is greater than that of the resin in the standard slurry, the magnetic field strength should be greater than 80MT; If the magnetic load of the single crystal diamond in the slurry is greater than the magnetic load of the single crystal diamond in the standard slurry and the resin viscosity is less than the resin viscosity in the standard slurry, the magnetic field strength should be less than 80MT.

3. The method for forming a directional resin-based diamond composite thermal conductive material according to claim 2, characterized in that: The mass ratio of diamond to magnetic iron oxide in the magnetically loaded single crystal diamond in the standard slurry is 8:1, and the viscosity of the resin is medium.

4. A device for realizing the method for forming the directional resin-based diamond composite thermal conductive material according to claims 1-3, comprising a frame, characterized in that: The frame is provided with: Material pool; Electromagnets, which are arranged on both sides of the material pool; A galvanometer, which is arranged below the material pool; A guide rail assembly is arranged at one end of the material pool; The forming plate is arranged above the material pool and is connected to the guide rail assembly through an adjustable fixing column.

5. The device according to claim 4, characterized in that: The frame is provided with an opening at a position corresponding to the output end of the galvanometer.

6. The device according to claim 4, characterized in that: A laser transparent window is provided at a position corresponding to the opening at the bottom of the material pool.

7. The device according to claim 4, characterized in that: The guide rail assembly includes a guide rail frame and a forming plate frame. One end of the forming plate is slidably connected to the guide rail frame and can reciprocate along the vertical direction of the material pool under the drive of the guide rail frame. The other end of the forming plate extends above the material pool.

8. The device according to claim 7, characterized in that: The frame, material pool, forming plate frame and forming plate are all made of non-ferromagnetic materials.

9. The device according to claim 4, characterized in that: The material-carrying end of the forming plate is provided with paint and texture.

10. The device according to claim 4, characterized in that: The magnetic poles of the electromagnets at both ends of the material pool are in the same direction.

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