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A Method for Improving the Interfacial Bonding Strength of Copper/Graphite Composite Materials

A technology of interface bonding strength and composite materials, which is applied in the field of self-lubricating high-conductivity composite materials, can solve the problems of unfavorable large-scale industrial production, reduce the overall conductivity of materials, and aggravate wear, so as to achieve improved bending strength, low cost, and interface pure effect

Active Publication Date: 2020-05-12
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although alloying the substrate can improve the wettability of copper and graphite, it will also significantly reduce the overall conductivity of the material
In addition, it was found that in the pantograph slide, the added alloy elements are easy to melt out under the action of the arc and crystallize on the contact surface of the friction pair, thereby aggravating the wear
However, the method for graphite modification is complex and costly, which is not conducive to large-scale industrial production.

Method used

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  • A Method for Improving the Interfacial Bonding Strength of Copper/Graphite Composite Materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for improving the interfacial strength of a copper / graphite composite material. The raw materials used include four types: copper powder, copper oxide, graphite and polyvinyl alcohol. Specific steps are as follows:

[0023] 1) The above-mentioned powders (except graphite) are mixed by high-speed stirring to obtain doped powder, and polyvinyl alcohol is added as a binder during the mixing process. Wherein the raw material weight ratio involved is: M 铜 :M 氧化铜 :M 聚乙烯醇 =76:4:1. Wherein the average particle size of the copper oxide powder is 13 μm.

[0024] 2) Put the doped powder obtained in step 1) together with graphite (mass fraction: 19%) in a V-type blender and mix evenly to obtain a mixed powder. Wherein the graphite is flake graphite with a particle size of 500 μm.

[0025] 3) Unidirectionally pressing the mixed powder obtained in step 2) under a pressure of 300 MPa to obtain a compact; sintering the obtained compact under vacuum hot pressing condition...

Embodiment 2

[0031] A method for improving the interfacial strength of a copper / graphite composite material. The raw materials used include four types: copper powder, copper oxide, graphite and polyvinyl alcohol. Specific steps are as follows:

[0032] 1) The above-mentioned powders (except graphite) are mixed by high-speed stirring to obtain doped powder, and polyvinyl alcohol is added as a binder during the mixing process. Wherein the raw material weight ratio involved is: M 铜 :M 氧化铜 :M 聚乙烯醇 =78:7:2. Wherein the average particle size of the copper oxide powder is 25 μm.

[0033] 2) Put the doped powder obtained in step 1) together with graphite (mass fraction: 13%) in a V-shaped blender and mix evenly to obtain a mixed powder. Wherein the graphite is flake graphite with a particle size of 355 μm.

[0034] 3) The mixed powder obtained in step 2) is unidirectionally pressed under a pressure of 450 MPa to obtain a green body; the obtained green body is sintered under the condition of ...

Embodiment 3

[0040] A method for improving the interfacial strength of a copper / graphite composite material. The raw materials used include four types: copper powder, copper oxide, graphite and polyvinyl alcohol. Specific steps are as follows:

[0041] 1) The above-mentioned powders (except graphite) are mixed by high-speed stirring to obtain doped powder, and polyvinyl alcohol is added as a binder during the mixing process. Wherein the raw material weight ratio involved is: M 铜 :M 氧化铜 :M 聚乙烯醇 =75:14:3. Wherein the average particle size of the copper oxide powder is 48 μm.

[0042] 2) Put the doped powder obtained in step 1) together with graphite (mass fraction: 8%) in a V-type blender and mix evenly to obtain a mixed powder. Wherein the graphite is flake graphite with a particle size of 250 μm.

[0043]3) Unidirectionally pressing the mixed powder obtained in step 2) under a pressure of 600 MPa to obtain a compact; sintering the obtained compact under vacuum hot pressing conditions...

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Abstract

The invention discloses a method for improving the interface bonding strength of a copper / graphite composite, and belongs to the technical field of self-lubrication high-conductivity composite preparation. The composite is prepared from copper powder, copper oxide / cuprous oxide powder, graphite and polyvinyl alcohol, wherein the weight ratio of M copper to M copper oxide / cuprous oxide to M graphite to M polyvinyl alcohol is equal to (70-80):(1-20):(5-25):(0.5-4). The ingredients are prepared according to the ratio and mixed to be uniform, and the mixed powder is pressed to obtain a biscuit; and the obtained biscuit is sintered under vacuum hot pressing conditions and subjected to furnace cooling to indoor temperature, and the copper / graphite composite is obtained. The method is characterized in that the certain amount of copper oxide / cuprous oxide is adopted as a copper source to react with graphite in the raw materials to enhance the interface. The copper / graphite composite prepared through the method has the advantages of being pure in interface, high in strength, good in electric and heat conductivity and the like, the process is simple, and the cost is low.

Description

technical field [0001] The invention relates to a method for improving the interface bonding strength of a copper / graphite composite material, so as to improve the bending strength, wear resistance and electrical and thermal conductivity of the material, and belongs to the technical field of self-lubricating high-conductivity composite material preparation. Background technique [0002] The copper / graphite composite material not only contains copper with good strength, hardness, electrical and thermal conductivity and corrosion resistance, but also contains graphite with good lubricity, high melting point, good welding resistance and arc ablation resistance, so that Copper / graphite composite materials play an important role in the fields of friction materials, oil bearings, electrical contact materials, conductive materials and mechanical parts materials, especially as pantograph slide materials and brush materials, and have a wide range of applications. Improving the compre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C1/10C22C9/00C22C32/00
CPCC22C1/0425C22C1/05C22C9/00C22C32/0084
Inventor 燕青芝彭韬张肖璐
Owner UNIV OF SCI & TECH BEIJING