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A kind of preparation method of graphite/copper composite material for sliding conduction

A technology of composite materials and graphite, which is applied in the field of preparation of graphite/copper composite materials for sliding conduction, can solve the problems of large damage to the friction pair material, component segregation, complex process, etc., and achieve cost improvement, reduced hindrance, and simple process Effect

Inactive Publication Date: 2016-11-30
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The content of the present invention is to provide a graphite / copper composite material preparation method for sliding conduction, aiming at the defects of graphite / copper composite material composition segregation, low strength, complex process and large damage to friction pair materials in the prior art , which can make it achieve the purpose of uniform composition, high strength, simple process and good lubricity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The experimental material of this embodiment has a density of 1.6g / cm 3 Molded graphite block, bending strength 18MPa, graphite blank size 10*10*50mm 3 . Specific implementation method: the first step, weigh copper powder and zirconium powder and configure it into 30g mixed powder, the mass fraction of zirconium powder is 5wt.%, fully stir and mix in the crucible; second step, place the graphite block in the corundum crucible, Completely embed the graphite block with the mixed powder; in the third step, place the corundum crucible with the graphite block and the mixed powder in a vacuum furnace, evacuate to 15 Pa, then raise the temperature to 1300°C, and stop heating after holding for 60 minutes; the fourth step, After the furnace temperature drops to room temperature, the graphite block is taken out from the crucible in the furnace, and the copper alloy on the surface of the graphite block is milled off to obtain the graphite / copper composite material. Its bending s...

Embodiment 2

[0022] The experimental material of this embodiment is that density is 1.8g / cm 3 Molded graphite block, flexural strength 21MPa, graphite blank size 10*10*50mm 3 . The specific implementation method: the first step, take copper powder and zirconium powder and configure it into 30g mixed powder, the mass fraction of Zr powder is 8wt.%, fully stir and mix in the crucible; second step, place the graphite block in the ceramic crucible, Embed the graphite block with mixed powder; in the third step, place the corundum crucible with built-in graphite block and mixed powder in a vacuum furnace, evacuate to 0.1Pa, then raise the temperature to 1200°C, and stop heating after holding for 30 minutes; the fourth step, After the furnace temperature drops to room temperature, the graphite block is taken out from the crucible in the furnace, and the copper alloy on the surface of the graphite block is milled off to obtain the graphite / copper composite material. Its bending strength ≥ 45MPa,...

Embodiment 3

[0024] The experimental material of this embodiment has a density of 1.8 g / cm 3 Molded graphite block, flexural strength 21MPa, graphite blank size 10*10*50mm 3 . Specific implementation method: the first step, weigh copper powder and zirconium powder and configure it into 30g mixed powder, the mass fraction of zirconium powder is 15wt.%, fully stir and mix in the crucible; second step, place the graphite block in the corundum crucible, Embed the graphite block with mixed powder; in the third step, place the ceramic crucible with built-in graphite block and mixed powder in a vacuum furnace, evacuate to 15Pa, then raise the temperature to 1300°C, and stop heating after holding for 60 minutes; in the fourth step, the furnace After the temperature drops to room temperature, the graphite block is taken out from the crucible in the furnace, and the copper alloy on the surface of the graphite block is milled off to obtain the graphite / copper composite material. Its bending strengt...

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Abstract

The invention relates to a preparation method of a graphite / copper composite material for slide electric conduction. The preparation method of the graphite / copper composite material for slide electric conduction uses copper powder and zirconium powder for preparing mixed powder to wrap a graphite block; and the graphite block is infiltrated in vacuum with high temperature in a crucible to obtain the graphite / copper composite material. The preparation method permeates a copper / zirconium alloy into a graphite basal body without pressure under a vacuum condition, so that two phases of copper and graphite generate no stratification. As the graphite / copper composite material is prepared by an infiltration method, and a copper phase adopts a communication structure, a hindering effect on electronic transmission is reduced, and the electrical resistivity is prominently reduced compared with a traditional graphite / copper material electric brush.

Description

technical field [0001] The invention relates to a preparation method of a graphite / copper composite material for sliding conduction. Background technique [0002] Graphite / copper composite material integrates the good contact lubricity, low thermal expansion coefficient and low density of graphite and the high electrical conductivity, thermal conductivity and good ductility of copper, so it has good electrical conductivity, thermal conductivity, wear resistance, and Arc ablation and anti-welding properties, widely used as various welding electrodes, electrical engineering switch contacts, generator collector rings, armatures, rotors, electric locomotive pantograph slides and empty frame contact wires and other materials . At present, brush materials are produced by traditional methods in China: graphite powder is mixed with copper powder, molded and sintered, and its wear resistance and strength are adjusted by adding pitch. However, graphite / copper composites prepared by ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C9/00
Inventor 杨琳乔力邓世岐
Owner TAIYUAN UNIV OF TECH