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Tungsten carbide enhanced copper-based powder metallurgy friction material and preparing method thereof

A friction material and powder metallurgy technology, applied in the field of friction material manufacturing and powder metallurgy, can solve the problems of unstable friction performance, large amount of wear, low friction coefficient, etc., and achieve the effects of low manufacturing cost, high hardness and high friction coefficient

Active Publication Date: 2019-03-15
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of low friction coefficient, large amount of wear and unstable friction performance in existing friction materials, the purpose of the present invention is to provide a tungsten carbide reinforced copper-based powder metallurgy friction material with stable friction and wear performance and its preparation method

Method used

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  • Tungsten carbide enhanced copper-based powder metallurgy friction material and preparing method thereof
  • Tungsten carbide enhanced copper-based powder metallurgy friction material and preparing method thereof
  • Tungsten carbide enhanced copper-based powder metallurgy friction material and preparing method thereof

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Experimental program
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Effect test

Embodiment 1

[0028] A tungsten carbide reinforced copper-based powder metallurgy friction material, which is composed of the following raw materials in weight percentages, copper powder is 50% to 70%, iron powder is 10% to 20%, tin powder is 1% to 5%, and graphite is 6% %~11% and 0.01%~15% for tungsten carbide.

[0029] For the above raw materials, copper is the matrix, which utilizes the characteristics of soft copper and high plasticity to reduce the wear of self-lubricating materials on the key parts in contact with it, and utilizes the high thermal conductivity of copper to absorb and export the heat generated during the braking process. Heat; iron is the same as the matrix phase, which can make up for the shortcomings of the strength of the copper matrix. Iron can be strengthened by graphite to improve hardness and strength. From the perspective of friction materials, iron powder is selected as the matrix reinforcement phase. Under the action of graphite, the strength of iron and hard...

Embodiment 2

[0042] A tungsten carbide reinforced copper-based powder metallurgy friction material is made of the following raw materials in the weight ratio: 0.01% tungsten carbide, 8% graphite, 18% iron powder, 4% tin powder, and 69.99% copper powder.

[0043] The particle size of tungsten carbide is 200 mesh, graphite is 100 mesh, iron powder is 280 mesh, tin powder is 280 mesh, copper powder is 200 mesh.

[0044] Concrete preparation process is as follows:

[0045] Weigh each raw material powder according to the above ratio, first put copper powder, iron powder, tin powder and tungsten carbide into the V-shaped mixer and mix for 2 hours, then add graphite powder and mix for 3 hours to make a uniformly mixed powder ;Put an appropriate amount of material powder into a regular hexagonal cold-pressing mold, and perform cold-pressing with a pressure of 400MPa, and hold the pressure for 3 minutes; put the sample after cold-pressing into a hot-pressing mold, and heat it in an argon atmosphere...

Embodiment 3

[0049] A tungsten carbide-reinforced copper-based powder metallurgy friction material is made of raw materials in the following weight ratio: 5% tungsten carbide powder, 8% graphite, 20% iron powder, 4% tin powder, and 63% copper powder.

[0050] The particle size of tungsten carbide is 150 mesh, graphite is 100 mesh, iron powder is 260 mesh, tin powder is 280 mesh, and copper powder is 180 mesh.

[0051] Concrete preparation process is as follows:

[0052] Weigh each raw material powder according to the above ratio, first put copper powder, iron powder, tin powder and tungsten carbide into the V-shaped mixer and mix for 2 hours, then add graphite powder and mix for 2 hours to make a uniformly mixed powder ; Add appropriate amount of material powder into a regular hexagonal cold-pressing mold, cold-press with a pressure of 300MPa, and hold the pressure for 15 minutes; put the cold-pressed sample into a hot-pressing mold, and heat it in an argon atmosphere Pressing and sinteri...

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Abstract

The invention discloses a tungsten carbide enhanced copper-based powder metallurgy friction material. The friction material comprises following raw materials including, by weight percent, 50%-70% of copper powder, 10%-20% of iron powder, 1%-5% of tin powder, 6%-11% of graphite and 0.01%-15% of tungsten carbide. Compared with similar materials, the novel tungsten carbide enhanced copper-based powder metallurgy friction material has the advantages that the matrix strength is high, hardness is high, the friction coefficient is high, the friction performance is stable, the abrasion amount is low,the preparing technology is simple, and the production cost is low; the comprehensive performance of the material is improved, and it is guaranteed that the material has stable friction performance, the high friction coefficient and good abrasion resistance; few microelement kinds exist, lead, asbestos and other components doing harm to health are not contained, the requirements for health safetyand environment protection are met; and in the preparing technology, the technology is simple, large-batch production is conveniently achieved, and the manufacturing cost is low.

Description

technical field [0001] The invention belongs to the technical fields of friction material manufacture and powder metallurgy, in particular to a powder metallurgy friction material for manufacturing railway vehicle brake pads and a preparation method thereof. Background technique [0002] Copper-based powder metallurgy friction materials have the characteristics of good thermal conductivity, corrosion resistance, and stable braking performance, and are widely used in braking devices such as automobiles, aircraft, and ships. This kind of material is prepared by using powder metallurgy preparation technology, choosing copper as the matrix component, and improving the comprehensive performance of the matrix by adding friction components and lubricating components. [0003] With the increase of train speed, the performance requirements of friction brake materials are getting higher and higher, which requires that friction materials can further enhance the friction and wear perfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/00C22C32/00C22C1/05C22C1/10B22F1/00B22F3/02B22F3/14
CPCC22C1/05C22C9/00C22C32/0047C22C32/0084B22F3/02B22F3/14B22F2999/00B22F1/052B22F2201/11
Inventor 樊江磊孙璐璐王霄李莹王艳吴深周向葵刘建秀
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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