Preparation method of high-thermal-conductivity copper-diamond composite material

Abstract

The invention belongs to the technical field of material preparation, and particularly relates to a high-thermal-conductivity copper-diamond composite material preparation method which comprises the following steps of (1) raw material preparation, (2) SLM equipment preparation and preheating, (3) model printing, (4) heat treatment, (5) finish machining and (6) classified inspection and storage. The screened diamond powder is cleaned and dried through alcohol, workers can conveniently operate and use the diamond powder, manufacturing of the composite material is more accurate, SLM equipment is cleaned through a dust collector, machining operation of the composite material is convenient, the situation that the composite material carries scraps during machining is avoided, and through heat treatment, the machining efficiency is improved. The composite material can be conveniently processed and operated, the mechanical property of the material can be improved, the structure and the organization of the material can be adjusted, the defects of the material can be repaired and improved, workers can conveniently inspect through inspection and storage, and the probability that the composite material has problems during use is smaller.

Description

Technical Field

[0001] The invention belongs to the technical field of material preparation, and in particular relates to a method for preparing a high thermal conductivity copper-diamond composite material. Background Art

[0002] With the continuous improvement of chip integration, electronic packaging is developing towards miniaturization, lightness and high performance, which makes the operating temperature of the circuit continue to rise, and the system unit volume heat rate continues to increase, resulting in unstable system operation. In order to obtain stable performance, the heat dissipation conditions must be improved. Therefore, the importance of electronic packaging in the field of microelectronics is constantly increasing, and the demand for new electronic packaging materials is also increasing. During production, composite materials can be made by mixing diamond powder and copper powder;

[0003] In order to solve the problem of continuous increase in operating temperature and unstable system operation during use, a method for preparing a high thermal conductivity copper-diamond composite material is proposed. Summary of the invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides a method for preparing a high thermal conductivity copper-diamond composite material, which has the characteristics of avoiding continuous increase in working temperature and ensuring stable system operation.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for preparing a high thermal conductivity copper-diamond composite material, comprising the following steps:

[0006] (1) Raw material preparation: crush the diamond raw material, screen and clean the crushed diamond particles, dry the screened and cleaned diamond powder, place the diamond powder and copper powder in a container according to a certain proportion, and stir and mix them with a stirring rod;

[0007] (2) SLM equipment preparation and preheating: The SLM equipment is cleaned with a vacuum cleaner, the residual powder on the SLM equipment is extracted, and it is wiped clean with alcohol. After cleaning, the substrate is placed in the equipment, installed and fixed with fixing bolts, the SLM equipment is preheated, and relevant process parameters are set;

[0008] (3) Printing model: The mixed diamond powder and copper powder are placed on a substrate, and the SLM equipment is used to melt and spray the placed powders, and stack them layer by layer to finally form a diamond / copper composite material;

[0009] (4) heat treatment: placing the diamond / copper composite material blank in a vacuum furnace, heating it to a first temperature under vacuum conditions and then keeping it at that temperature for a certain period of time, heating the blank to a second temperature under vacuum conditions and then keeping it at that temperature for a certain period of time, while keeping it at that temperature, intermittently filling the vacuum furnace with hydrogen and evacuating it, cooling the blank to a third temperature under vacuum conditions, and then filling it with inert gas or nitrogen to normal pressure, and continuing to cool the blank to room temperature to heat treat the prepared composite material to make its structure more compact;

[0010] (5) Finishing: The heat-treated composite material is taken out and processed and treated by grinding, polishing and other processes to achieve the required size and surface roughness;

[0011] (6) Classification, inspection and storage: The staff will inspect the processed composite materials, eliminate unqualified composite materials, store qualified composite materials, and mark them with labels for easy differentiation and use.

[0012] Preferably, in step (1), the diamond raw material is cleaned with alcohol to remove organic matter and grease on the surface of the diamond.

[0013] Preferably, the process parameters need to be precisely controlled during the SLM process for preparing the diamond / copper composite material in step (2).

[0014] Preferably, the processed composite material in step (3) is placed in a container containing cooling water for cooling.

[0015] Preferably, the composite material after the heat treatment in step (5) is taken out, clamped and limited by a clamping mechanism, cut and trimmed by a grinder, and ground and polished by a polishing device.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention crushes and screens the diamond raw materials, and washes and dries the screened diamond powder with alcohol, so that it is convenient for the staff to operate and use it, and it is more accurate when making the composite material. The SLM equipment is cleaned by a vacuum cleaner, so that the composite material processing operation is convenient and debris is avoided during the composite material processing. Through heat treatment, the composite material processing operation is convenient, and the mechanical properties of the material can be improved, the structure and organization of the material can be adjusted, and the defects of the material can be repaired and improved. Through inspection and storage, it is convenient for the staff to check, so that the probability of problems occurring when the composite material is used is smaller. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Example 1

[0020] The present invention provides the following technical solution: a method for preparing a high thermal conductivity copper-diamond composite material, comprising the following steps:

[0021] (1) Raw material preparation: crush the diamond raw material, screen and clean the crushed diamond particles, dry the screened and cleaned diamond powder, place the diamond powder and copper powder in a container according to a certain proportion, and stir and mix them with a stirring rod. By crushing and screening the diamond raw material, and cleaning and drying the screened diamond powder with alcohol, it is convenient for the staff to operate and use, and more accurate when making composite materials;

[0022] (2) SLM equipment preparation and preheating: The SLM equipment is cleaned with a vacuum cleaner to facilitate composite material processing operations and avoid debris from being carried during composite material processing. The residual powder on the SLM equipment is extracted and cleaned with alcohol. After cleaning, the substrate is placed in the equipment and fixed with fixing bolts. The SLM equipment is preheated and relevant process parameters are set.

[0023] (3) Printing model: The mixed diamond powder and copper powder are placed on a substrate, and the SLM equipment is used to melt and spray the placed powders, and stack them layer by layer to finally form a diamond / copper composite material;

[0024] (4) Heat treatment: placing the diamond / copper composite material blank in a vacuum furnace, heating it to a first temperature under vacuum conditions and then keeping it at that temperature for a certain period of time, heating the blank to a second temperature under vacuum conditions and then keeping it at that temperature for a certain period of time, while keeping it at that temperature, intermittently filling the vacuum furnace with hydrogen and evacuating the vacuum furnace, cooling the blank to a third temperature under vacuum conditions, and then filling it with inert gas or nitrogen to normal pressure, and continuing to cool the blank to room temperature to heat treat the prepared composite material to make its structure more compact. Through heat treatment, the composite material can be easily processed, and the mechanical properties of the material can be improved, the structure and organization of the material can be adjusted, and the defects of the material can be repaired and improved;

[0025] (5) Finishing: The heat-treated composite material is taken out and processed and treated by grinding, polishing and other processes to achieve the required size and surface roughness;

[0026] (6) Classification, inspection and storage: The staff will inspect the processed composite materials, eliminate the unqualified composite materials, store the qualified composite materials, mark them with labels to facilitate their differentiation and use. The inspection and storage will facilitate the staff to check, which will reduce the probability of problems when the composite materials are used.

[0027] Specifically, in step (1), the diamond raw material is cleaned with alcohol to remove organic matter and grease on the surface of the diamond.

[0028] Specifically, the process parameters need to be precisely controlled during the SLM process of preparing the diamond / copper composite material in step (2).

[0029] Specifically, the processed composite material in step (3) is placed in a container containing cooling water for cooling.

[0030] Specifically, the composite material after the heat treatment in step (5) is taken out, the composite material is clamped and limited by a clamping mechanism, the composite material is cut and trimmed by a grinder, and the composite material is ground and polished by a polishing device.

[0031] Working principle and use process of the present invention: When the present invention is used, the staff selects diamond raw materials, puts the diamond raw materials into a grinder for grinding operation, puts the crushed diamond powder into a screening machine for screening, cleans the diamond powder that meets the requirements with alcohol, cleans the organic matter and grease on the surface of the diamond, and after cleaning, dries the diamond powder, takes out appropriate dosages of diamond powder and copper powder, mixes them according to the proportion, puts them in the same container, stirs and mixes them with a stirring rod, turns on the SLM equipment, and extracts the dust remaining in the SLM equipment with a vacuum cleaner. After cleaning, spray alcohol in the SLM equipment and wipe it with a wipe;

[0032] The substrate used for composite material production is placed in the SLM equipment and fixed by fixing bolts. Diamond powder and copper powder are placed on the substrate, and the SLM equipment is closed. The relevant process parameters are set for the SLM equipment for processing. After production, the composite material is heat treated to improve the mechanical properties of the material, adjust the structure and organization of the material, and repair and improve the defects of the material. After heat treatment, the composite material is ground and polished to obtain the required size. After processing, the staff inspects the composite material, marks it and stores it for the convenience of staff use.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing a high thermal conductivity copper-diamond composite material, comprising the following steps, characterized in that: (1) Raw material preparation: crush the diamond raw material, screen and clean the crushed diamond particles, dry the screened and cleaned diamond powder, place the diamond powder and copper powder in a container according to a certain proportion, and stir and mix them with a stirring rod; (2) SLM equipment preparation and preheating: The SLM equipment is cleaned with a vacuum cleaner, the residual powder on the SLM equipment is extracted, and it is wiped clean with alcohol. After cleaning, the substrate is placed in the equipment, installed and fixed with fixing bolts, the SLM equipment is preheated, and relevant process parameters are set; (3) Printing model: The mixed diamond powder and copper powder are placed on a substrate, and the SLM equipment is used to melt and spray the placed powders, and stack them layer by layer to finally form a diamond / copper composite material; (4) Heat treatment: placing the diamond / copper composite material blank in a vacuum furnace, heating it to a first temperature under vacuum conditions and then keeping it at that temperature for a certain period of time, heating the blank to a second temperature under vacuum conditions and then keeping it at that temperature for a certain period of time, while intermittently filling the vacuum furnace with hydrogen and evacuating the vacuum furnace, cooling the blank to a third temperature under vacuum conditions, and then filling it with inert gas or nitrogen to normal pressure, and continuing to cool the blank to room temperature to heat treat the prepared composite material to make its structure more compact; (5) Finishing: The heat-treated composite material is taken out and processed and treated by grinding, polishing and other processes to achieve the required size and surface roughness; (6) Classification, inspection and storage: The staff will inspect the processed composite materials, eliminate unqualified composite materials, store qualified composite materials, and mark them with labels for easy differentiation and use.

2. The method for preparing a high thermal conductivity copper-diamond composite material according to claim 1, characterized in that: In step (1), the diamond raw material is cleaned with alcohol to remove organic matter and grease on the surface of the diamond.

3. The method for preparing a high thermal conductivity copper-diamond composite material according to claim 1, characterized in that: The process of preparing the diamond / copper composite material by SLM in step (2) requires precise control of process parameters.

4. The method for preparing a high thermal conductivity copper-diamond composite material according to claim 1, characterized in that: The processed composite material in step (3) is placed in a container containing cooling water for cooling.

5. The method for preparing a high thermal conductivity copper-diamond composite material according to claim 1, characterized in that: The composite material after the heat treatment in step (5) is taken out, clamped and limited by a clamping mechanism, cut and trimmed by a grinder, and ground and polished by a polishing device.