Preparation method of carbon layer coated three-dimensional structure based on laminated metal net

Abstract

The invention discloses a preparation method of a carbon layer coated three-dimensional structure based on a laminated metal net. The preparation method comprises the following steps: preparing metal nets with different detail designs and metal gaskets matched with the metal nets for use; printing conductive carbon oil on a metal net, and baking to obtain a metal net coated with a carbon layer; and the metal gaskets are arranged between the metal nets printed with the carbon layers, the peripheries of the metal nets make contact with the metal gaskets and are pressed tightly, a laminated metal net is formed, homogeneous welding is conducted on the contact areas of the metal nets and the metal gaskets, and preparation is completed. According to the preparation method, the metal nets with different design details are prepared, the metal nets are coated with the carbon layers in all directions, homogeneous welding is carried out under the action of the metal gaskets, the three-dimensional mechanical structural part which is coated with the carbon layers in all areas and high in mechanical strength can be rapidly prepared, and meanwhile the preparation method has the advantages of being simple in process, convenient to operate and the like; large-scale preparation can be realized, and industrial application is facilitated.

Description

Technical Field

[0001] The invention belongs to the field of electronic technology and relates to a method for preparing a carbon layer-coated three-dimensional structure based on a laminated metal mesh. Background Art

[0002] Electron beam evaporation equipment, electron beam microscopes, electron beam exposure machines and other instruments use electron guns or electron optical columns to control the movement of electron beams. When the mechanical parts are bombarded by electron beams, they often have strong electron scattering. Therefore, in order to reduce electron scattering while maintaining sufficient mechanical strength, it is necessary to add a sufficiently thick carbon layer to reduce electron scattering and build a metal skeleton to maintain mechanical strength. Therefore, it is of great significance to obtain a mechanical part structure with sufficient carbon layer thickness that can be effectively coated on the surface of the metal skeleton and has high mechanical strength.

[0003] There are many methods for preparing carbon films, the most commonly used ones include physical vapor deposition, chemical vapor deposition, electrochemical deposition, etc. The carbon films prepared by physical vapor deposition are relatively fine, and their thickness is usually between tens of nanometers and several microns, usually less than 5 microns; chemical vapor deposition is faster and the film is relatively rough, but the film thickness is also limited. In addition, the equipment required for physical and chemical vapor deposition is complex, the system is sophisticated, and the cost of preparing carbon films is relatively high. Electrochemical deposition is more cost-effective but is also limited by the film thickness, which is usually less than 5 microns.

[0004] When the thickness of the carbon layer reaches more than 50 microns, it can be prepared by rolling forming, and the carbon layer coating structure can be realized by punching and cutting after superposition with the copper layer. However, this preparation method is difficult to take into account the precision structure of tens of microns on the two-dimensional plane. At the same time, the side wall area of ​​the cut hole will leave a carbon-free surface, and the carbon layer coating of the entire area cannot be achieved. In addition, the three-dimensional structure can also be immersed in a carbon solution, and a fully covered three-dimensional structure will be left after drying, but this method easily causes the carbon layer between the fine structures to bond, and the original three-dimensional structure function cannot be maintained. In addition, in the PCB board preparation process in the field of integrated circuits, there is a method for preparing a carbon layer of 20 microns, but it is difficult to form mechanical structural parts.

[0005] Therefore, obtaining a method for preparing three-dimensional mechanical structures with simple process, easy operation and full coverage of carbon layer is of great significance for promoting the widespread use of instruments such as electron beam evaporation equipment, electron beam microscope, and electron beam exposure machine. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a method for preparing a carbon layer-coated three-dimensional structure based on a laminated metal mesh with simple process and convenient operation in view of the deficiencies existing in the prior art.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: A method for preparing a carbon layer-coated three-dimensional structure based on a laminated metal mesh comprises the following steps: S1. According to the functions, metal meshes with different detailed designs and metal gaskets used in conjunction with the metal meshes are prepared; S2, printing the conductive carbon oil on the metal mesh with different detail designs to obtain the metal mesh coated with the conductive carbon oil; S3, baking the metal mesh coated with the conductive carbon oil to obtain a metal mesh coated with a carbon layer; S4, placing metal gaskets between metal meshes printed with carbon layers, making the outer periphery of each metal mesh contact with the metal gasket, and pressing tightly to form a laminated metal mesh; S5. Homogeneously weld the contact area between the metal mesh and the metal gasket to connect the outer periphery of the metal mesh with the metal gasket, thereby completing the preparation of the carbon layer-coated three-dimensional structure based on the laminated metal mesh.

[0008] The above-mentioned preparation method is further improved, in step S1, the metal mesh includes a structural area and a welding area; the welding area is located at the periphery of the structural area.

[0009] The above preparation method is further improved in that the mesh patterns of the structural areas in the metal meshes with different detail designs are the same.

[0010] The above preparation method is further improved in that the mesh pattern of the structural area is a honeycomb-shaped hole or a circular-shaped hole, but is not limited thereto.

[0011] The above preparation method is further improved in that the thickness of the structural area is 0.05mm to 2mm.

[0012] The above preparation method is further improved in that the line width of the structure area is 0.02 mm to 2 mm.

[0013] The above preparation method is further improved in that the spacing between the lines in the structure area is 0.05 mm to 2 mm.

[0014] The above-mentioned preparation method is further improved in that the welding area is provided with positioning holes and threaded holes.

[0015] The above-mentioned preparation method is further improved in that the shape of the welding area is circular.

[0016] The above preparation method is further improved in that the line width of the welding area is ≥5 mm.

[0017] The above preparation method is further improved, in step S1, the total size of the metal mesh is ≤300 mm×300 mm; and the metal mesh is a copper mesh.

[0018] The above-mentioned preparation method is further improved, in which, in step S1, the shape and material of the metal gasket are the same as the outer periphery of the metal mesh.

[0019] The above preparation method is further improved in that the thickness of the metal gasket is 0.01 mm to 0.1 mm.

[0020] The above preparation method is further improved, in step S1, the preparation method of the metal mesh with different detail designs comprises the following steps: (1.1) Transfer different detailed designs to metal etching films according to their functions; (1.2) Based on the metal etching film, a mixed solution of nitric acid, sulfuric acid and sodium chloride is used to etch the metal sheet to obtain a metal mesh with different detailed designs.

[0021] The above preparation method is further improved and further comprises: repeating step S2 and step S3 until the thickness of the carbon layer meets the design requirements; the thickness of the carbon layer is 5 μm to 50 μm.

[0022] The above preparation method is further improved, in step S2, the preparation method of the metal mesh coated with conductive carbon oil comprises the following steps: (2.1) Transfer different detailed designs to the screen printing stencil according to the function; (2.2) Print conductive carbon oil on the metal mesh according to the screen printing plate, so that the conductive carbon oil is coated on the front surface and side walls of the metal mesh, thereby obtaining a metal mesh coated with conductive carbon oil.

[0023] The above preparation method is further improved, in step S3, the baking is carried out at a temperature of 150° C. to 300° C. and the baking time is 5 min to 35 min.

[0024] The above preparation method is further improved in that in step S4, a graphite clamp is used to press the outer periphery of the metal mesh.

[0025] The above-mentioned preparation method is further improved, in step S4, the mesh holes of different metal meshes in the laminated metal mesh have the same position, or are arranged in a staggered manner to form a vertical, inclined, or curved through hole as a whole.

[0026] The above preparation method is further improved, in step S5, the homogeneous welding is performed under vacuum conditions; the temperature of the homogeneous welding is 750°C to 1050°C.

[0027] The above preparation method is further improved, in step S5, after the homogeneous welding is completed, it also includes annealing the carbon layer coated three-dimensional structure based on the laminated metal mesh.

[0028] Compared with the prior art, the advantages of the present invention are: In view of the defects that it is difficult to quickly prepare a three-dimensional mechanical structure with a full-area carbon layer coating in the preparation method, the present invention provides a preparation method for a carbon layer-coated three-dimensional structure based on a laminated metal mesh. According to the design matching function, metal meshes with different detailed designs and metal gaskets used in conjunction with the metal meshes are prepared, and then conductive carbon oil is printed on the metal meshes with different detailed designs, and the carbon layer of sufficient thickness is coated on the metal mesh by baking, so that the carbon layer is coated on the front and back surfaces and side walls of the metal mesh to achieve all-round coating. On this basis, the metal gasket is arranged between the metal meshes printed with the carbon layer, so that the outer periphery of each metal mesh is in contact with the metal gasket and pressed tightly. A laminated metal mesh is formed, and finally the contact area of ​​the metal mesh and the metal gasket is homogenously welded. During the homogenous welding process, the periphery of the metal mesh (welding area) is infiltrated and connected with the metal gasket, so that the periphery of the metal mesh is tightly connected with the metal gasket, and the contact surface of the welding area is completely closed. More importantly, during the homogenous welding process, the carbon layers between different metal meshes contact each other but do not adhere together, and at the same time, the carbon layer can be promoted to cover the structural area of ​​the metal mesh, thereby maintaining the original three-dimensional mechanical structure, and quickly preparing a three-dimensional mechanical structure with a full-area carbon layer coating, which is the carbon layer-coated three-dimensional structure based on the laminated metal mesh of the present invention. The preparation method of the present invention can quickly prepare a three-dimensional mechanical structure with a full-area carbon layer coating and high mechanical strength by preparing metal meshes with different design details and coating these metal meshes with carbon layers in all directions, and performing homogenous welding under the action of the metal gasket. At the same time, the preparation method of the present invention also has the advantages of simple process and convenient operation, and can realize large-scale preparation and facilitate industrial application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0030] Figure 1 This is a physical picture of the copper mesh after film etching in Example 1 of the present invention.

[0031] Figure 2 This is a physical picture of the copper mesh after screen printing carbon oil in Example 1 of the present invention.

[0032] Figure 3 This is a SEM image of the copper mesh after baking in Example 1 of the present invention.

[0033] Figure 4 This is a microscopic photograph of the carbon layer-coated three-dimensional structure based on the laminated metal mesh prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0035] Embodiment 1: A method for preparing a carbon layer-coated three-dimensional structure based on a laminated metal mesh comprises the following steps: S1. According to the functions, metal meshes with different detailed designs and metal gaskets used in conjunction with the metal meshes are prepared, as follows: The metal mesh is a metal copper mesh, including a structural area and a welding area, the welding area is located at the periphery of the structural area, and the total size of the metal mesh composed of the structural area and the welding area is 300 mm×300 mm.

[0036] (1.1) The structure area pattern is designed according to the functional requirements of anti-scattering, wherein the mesh pattern of the structure area is a circular ring hole, the thickness of the structure area is 0.05 mm to 2 mm, the line width of the structure area is 0.0992 mm, and the spacing between the lines in the structure area is 0.05 mm to 2 mm. A welding area is set on the periphery of the metal mesh, which is in the shape of a circular ring and has a line width of 6 mm. Positioning holes and threaded holes are provided in the welding area to position the multi-layer metal mesh.

[0037] (1.2) Transfer different detailed designs to metal etching film according to the function.

[0038] (1.3) Based on the metal etching film, a mixed solution of nitric acid, sulfuric acid and sodium chloride is used to etch the metal sheet of appropriate thickness to remove impurities on the surface of the metal sheet and obtain a metal mesh with different detailed designs.

[0039] In this embodiment, the metal plate used is a copper plate.

[0040] In addition, a metal gasket is prepared according to the welding area of ​​the metal mesh, wherein the shape and material of the metal gasket are the same as the outer periphery (welding area) of the metal mesh, that is, the shape of the metal gasket is circular, the width is 6 mm, and the material is copper. At the same time, the thickness of the metal gasket is 0.01 mm to 0.1 mm.

[0041] S2, printing the conductive carbon oil on the metal mesh to obtain the metal mesh coated with the conductive carbon oil, specifically: (2.1) Transfer different detailed designs to the screen printing stencil according to the function.

[0042] (2.2) According to the screen printing screen, the scraper speed and scraper pressure are set, and the conductive carbon oil is printed on the metal mesh with different detail designs, so that the conductive carbon oil is coated on the front side and side walls of the metal mesh, thereby obtaining a metal mesh coated with the conductive carbon oil.

[0043] S3. The metal mesh coated with the conductive carbon oil is baked at a temperature of 180° C. for 20 min to obtain different metal meshes coated with a carbon layer.

[0044] Step S2 and step S3 are repeated until the thickness of the carbon layer meets the design requirements, wherein the thickness of the carbon layer is 50 μm.

[0045] S4. According to the function, a metal gasket is arranged between different metal meshes printed with a carbon layer, so that the periphery of each metal mesh contacts the metal gasket, and a graphite clamp is used to press the periphery of the metal mesh to form a laminated metal mesh, wherein the mesh holes of different metal meshes in the laminated metal mesh have the same position.

[0046] S5. Place the laminated metal mesh into a vacuum thermal diffusion welding furnace, evacuate the furnace and heat it to 1050°C, and perform homogeneous welding on the contact area between the metal mesh and the metal gasket. During the homogeneous welding process, the periphery of the metal mesh (welding area) is infiltrated and connected with the metal gasket, so that the periphery of the metal mesh and the metal gasket are tightly connected together, and the contact surface of the welding area is completely closed. At the same time, during the homogeneous welding process, the carbon layers between different metal meshes are in contact with each other but will not adhere together, and can promote the coating of the carbon layer on the structural area of ​​the metal mesh, thereby maintaining the original three-dimensional mechanical structure, and quickly preparing a three-dimensional mechanical structure with full-area carbon layer coating.

[0047] In step S5, after homogeneous welding is completed, the three-dimensional mechanical structure with the carbon layer coated in the entire area is annealed to remove stress, thereby obtaining the carbon layer coated three-dimensional structure based on the laminated metal mesh of the present invention.

[0048] Figure 1 This is a physical picture of the copper mesh after film etching in Example 1 of the present invention.

[0049] Figure 2 This is a physical picture of the copper mesh after screen printing carbon oil in Example 1 of the present invention.

[0050] Figure 3 This is a SEM image of the copper mesh after baking in Example 1 of the present invention. Figure 3 This is a characterization of a single wire in the copper mesh before welding. In order to characterize the characteristics of the carbon layer, this copper wire was cut. Figure 3It can be seen that the width of the copper mesh line is 0.0992mm. At the same time, after a carbon printing process, a non-uniform layer of 21.6μm thick carbon material is attached to the copper mesh line; different areas on the left and right sides of the copper mesh line are attached with a carbon layer with a thickness ranging from 6.66μm to 7.29 to 12.7μm and up to 16.4μm. It can be seen that the carbon layer has achieved full coverage of the copper mesh line (including the front and both sides).

[0051] Figure 4 This is a microscopic photograph of the carbon layer-coated three-dimensional structure based on the laminated metal mesh prepared in Example 1 of the present invention. Figure 4 It can be clearly seen that a three-dimensional threaded hole is formed after welding. Figure 4 As can be seen in the figure, the multiple layers of copper sheets are closely connected. By printing carbon on the welding area of ​​the top and bottom copper meshes, the entire three-dimensional structure can be covered with carbon film. In addition, the number of welding layers can be adjusted as needed.

[0052] It can be seen from the above results that compared with the conventional preparation method, in the preparation method of the present invention, by preparing metal meshes with different design details and coating these metal meshes with carbon layers in all directions, and performing homogeneous welding under the action of metal gaskets, a three-dimensional mechanical structure with full-area carbon layer coating and high mechanical strength can be quickly prepared. At the same time, the preparation method of the present invention also has the advantages of simple process and easy operation, can realize large-scale preparation, and is convenient for industrial application.

[0053] The above embodiments are only preferred implementations of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A method for preparing a carbon layer-coated three-dimensional structure based on a laminated metal mesh, characterized in that: The following steps are involved: S1. Prepare metal meshes with different detailed designs and metal gaskets used in conjunction with the metal meshes; S2, printing the conductive carbon oil on the metal mesh with different detail designs to obtain the metal mesh coated with the conductive carbon oil; S3, baking the metal mesh coated with the conductive carbon oil to obtain a metal mesh coated with a carbon layer; S4, placing metal gaskets between metal meshes printed with carbon layers, making the outer periphery of each metal mesh contact with the metal gasket, and pressing tightly to form a laminated metal mesh; S5. Homogeneously weld the contact area between the metal mesh and the metal gasket to connect the outer periphery of the metal mesh with the metal gasket, thereby completing the preparation of the carbon layer-coated three-dimensional structure based on the laminated metal mesh.

2. The preparation method according to claim 1, characterized in that: In step S1, the metal mesh includes a structural area and a welding area; the welding area is located at the periphery of the structural area.

3. The preparation method according to claim 2, characterized in that The mesh patterns of the structural areas in the metal meshes with different detail designs are the same; the mesh patterns of the structural areas are honeycomb holes or ring holes; the thickness of the structural areas is 0.05 mm to 2 mm; the line width of the structural areas is 0.02 mm to 2 mm; the spacing between the lines in the structural areas is 0.05 mm to 2 mm; The welding area is provided with positioning holes and threaded holes; the shape of the welding area is circular; the line width of the welding area is ≥5 mm.

4. The preparation method according to claim 3, characterized in that In step S1, the total size of the metal mesh is ≤300 mm×300 mm; and the metal mesh is a copper mesh.

5. The preparation method according to claim 4, characterized in that In step S1, the shape and material of the metal gasket are the same as the outer circumference of the metal mesh; the thickness of the metal gasket is 0.01 mm to 0.1 mm.

6. The preparation method according to any one of claims 1 to 5, characterized in that In step S1, the method for preparing the metal mesh with different detail designs comprises the following steps: (1.1) Transfer different detailed designs to metal etching film; (1.2) Based on the metal etching film, a mixed solution of nitric acid, sulfuric acid and sodium chloride is used to etch the metal sheet to obtain a metal mesh with different detailed designs.

7. The preparation method according to any one of claims 1 to 5, characterized in that Also includes: Repeat step S2 and step S3 until the thickness of the carbon layer meets the design requirements; the thickness of the carbon layer is 5 μm to 50 μm.

8. The preparation method according to claim 7, characterized in that: In step S2, the method for preparing the metal mesh coated with conductive carbon oil comprises the following steps: (2.1) Transfer different detailed designs to the screen printing stencil according to the design matching function; (2.2) Print conductive carbon oil on the metal mesh according to the screen printing screen, so that the conductive carbon oil is coated on the front and side walls of the metal mesh, thereby obtaining a metal mesh coated with conductive carbon oil.

9. The preparation method according to claim 7, characterized in that: In step S3, the baking temperature is 150° C. to 300° C. and the baking time is 5 min to 35 min.

10. The preparation method according to any one of claims 1 to 5, characterized in that: In step S4, a graphite clamp is used to press the outer periphery of the metal mesh; the mesh holes of different metal meshes in the laminated metal mesh have the same position, or are arranged in a staggered manner to form vertical, inclined, or curved through holes as a whole; In step S5, the homogeneous welding is performed under vacuum conditions; the temperature of the homogeneous welding is 750° C. to 1050° C.; after the homogeneous welding is completed, the carbon layer-coated three-dimensional structure based on the laminated metal mesh is annealed.

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