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A kind of preparation method of copper-iron-based friction material

A friction material, copper-iron technology, which is applied in the field of preparation of copper-iron-based friction materials, can solve the problems of low carbon content, poor interface bonding, friction material tribological properties and poor lubrication performance, etc., to achieve uniform and stable pore distribution The effect of improving the coefficient of friction and improving the overall strength

Active Publication Date: 2021-10-19
DALIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, copper-based powder metallurgy friction materials still have some problems such as high cost, low hardness, low density after sintering and high wear rate, especially in the application of high-speed rail train braking materials
At present, the carbon content of powder metallurgy copper-iron-based friction materials is low, and the tribological properties and lubricating properties of friction materials are poor. At the same time, because copper and carbon do not wet each other, the interface bonding between the two materials is poor, which reduces the continuity of the matrix and reduces the strength. reduced, increased wear

Method used

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  • A kind of preparation method of copper-iron-based friction material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] ⑴Manufacturing process:

[0027] Copper-clad iron powder (Fe-25Cu) (particle sizeCu = 25%);

[0028] Ni powder (particle sizeNi >99.9%);

[0029] Mn powder (particle sizeMn >99.9%);

[0030] Cr powder (particle sizeCr >99.9%);

[0031] WC powder (particle sizeWC >99.9%);

[0032] Copper clad graphite powder (flaky graphite) (particle size Cu = 50%);

[0033] The second step, design mass ratio, WC: 2wt%, Ni: 1wt%; Mn powder and Cr powder (the mass ratio of Mn powder and Cr powder is 1:1): 0.5wt%; Copper clad graphite: 4wt%, Fe -25Cu: 92.5 wt%.

[0034] The third step is to weigh each raw material according to the above-mentioned raw material ratio, first put copper-clad iron powder, Ni powder, WC powder, Mn powder and Cr powder into a planetary high-energy ball mill and mix for 5-8 hours, then copper-clad iron powder Graphite powder was put into planetary high-energy ball mill and mixed for 5 hours;

[0035] The fourth step is to cold press the powder into a cylin...

Embodiment 2

[0041] ⑴Manufacturing process:

[0042] Copper-clad iron powder (Fe-25Cu) (particle sizeCu = 25%);

[0043] Ni powder (particle sizeNi >99.9%);

[0044] Mn powder (particle sizeMn >99.9%);

[0045] Cr powder (particle sizeCr >99.9%);

[0046] WC powder (particle sizeWC >99.9%);

[0047] Copper clad graphite powder (flaky graphite) (particle size Cu = 50%);

[0048] The second step, design mass ratio, WC: 6wt%, Ni: 3wt%; Mn powder and Cr powder (the mass ratio of Mn powder and Cr powder is 1:1): 1wt%; Copper clad graphite: 10wt%, Fe- 25Cu: 80 wt%.

[0049] The third step is to weigh each raw material according to the above-mentioned raw material ratio, first put copper-clad iron powder, Ni powder, WC powder, Mn powder and Cr powder into a planetary high-energy ball mill and mix for 5-8 hours, then copper-clad iron powder Graphite powder was put into planetary high-energy ball mill and mixed for 5 hours;

[0050] The fourth step is to cold press the powder into a cylindrica...

Embodiment 3

[0055] ⑴Manufacturing process:

[0056] Copper-clad iron powder (Fe-25Cu) (particle sizeCu = 25%);

[0057] Ni powder (particle sizeNi >99.9%);

[0058] Mn powder (particle sizeMn >99.9%);

[0059] Cr powder (particle sizeCr >99.9%);

[0060] WC powder (particle sizeWC >99.9%);

[0061] Copper clad graphite powder (flaky graphite) (particle size Cu = 50%);

[0062] The second step, design mass ratio, WC: 4wt%, Ni: 2wt%; Mn powder and Cr powder (the mass ratio of Mn powder and Cr powder is 1:1): 0.5wt%; Copper clad graphite: 6wt%, Fe -25Cu: 87.5 wt%.

[0063] The third step is to weigh each raw material according to the above-mentioned raw material ratio, first put copper-clad iron powder, Ni powder, WC powder, Mn powder and Cr powder into a planetary high-energy ball mill and mix for 5-8 hours, then copper-clad iron powder Graphite powder was put into planetary high-energy ball mill and mixed for 5 hours;

[0064] The fourth step is to cold press the powder into a cylin...

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Abstract

The invention provides a method for preparing a copper-iron-based friction material, which belongs to the technical field of brake friction composite material preparation. Add 1wt%-3wt% of strengthening components Ni, 0.5wt%-1wt% of alloying components Mn and Cr, 2wt%-6wt% of friction components, and 4wt% of lubricating components of copper-coated graphite in the copper-clad iron powder matrix. 10wt%, using the powder metallurgy method to prepare the brake low-wear copper-iron-based friction material. In the present invention, copper-coated graphite is used instead of graphite powder as a lubricating component, which effectively improves the disadvantage of poor wettability between copper and graphite during the sintering process, so that graphite can be evenly distributed in the entire friction material, and through component optimization design and Process exploration shows that the obtained powder metallurgy copper-iron friction material has low porosity and uniform distribution, which makes the friction material have the characteristics of high strength, low wear rate and stable friction coefficient.

Description

technical field [0001] The invention relates to the technical field of preparation of brake friction materials, and in particular provides a method for preparing copper-iron-based friction materials. Background technique [0002] The working principle of the friction material is to use the tribological properties of the friction material to convert kinetic energy into heat or other forms of energy in various braking devices, thereby braking the rotating device. Powder metallurgy friction material refers to the friction material made of metal or alloy as the matrix, adding strengthening components, lubricating components, friction components, and using powder metallurgy technology. It is widely used in the production of friction plates for friction clutches and friction brakes. The friction material made by powder metallurgy technology has the advantages of relatively easy control of porosity, basically one-time molding, stable friction coefficient, excellent thermal conduct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/42C22C38/44C22C33/02
CPCC22C33/0264C22C33/0292C22C38/04C22C38/42C22C38/44
Inventor 付传起项永矿王宙星仓龙
Owner DALIAN UNIV