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Copper-based powder metallurgy friction material containing mixed graphite and preparation method

A friction material and powder metallurgy technology, applied in the field of friction material manufacturing, can solve problems such as difficulty in meeting train braking requirements, unstable friction coefficient, and low instantaneous temperature of materials, and achieve low friction noise, good lubrication effect, and low friction vibration. Effect

Active Publication Date: 2021-06-18
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Chinese Patent Publication No. CN105014956A discloses a closed-angle internal pressurization process suitable for composite hard glued structures. In this patent, a mixture of artificial graphite and flake graphite is added to the resin-based friction material to reduce the thermal decay of the material. , but the materials mentioned in the comparative document are basically organic matter, and are mostly used for the braking of vehicles such as vehicles with low braking energy. The braking energy and the instantaneous temperature of the material during braking are both low
[0008] Comparing these patents, it can be seen that only flake graphite is used in the current copper-based powder metallurgy friction materials. Under the conditions of dynamic speed (greater than 350km / h) and braking energy, the existing copper-based friction materials have the problems of unstable friction coefficient and large amount of wear, and it is difficult to meet the braking requirements of trains at high speeds

Method used

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  • Copper-based powder metallurgy friction material containing mixed graphite and preparation method

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Embodiment 1

[0030] A copper-based powder metallurgy friction material containing mixed graphite, the components are as follows by mass percentage: Cu (57%), Fe (16%), Cr-Fe (12%), MoS 2 (2%), Sn (4%), coke (0%) and flake graphite (9%). Wherein, the copper powder is 200 mesh electrolytic copper powder; the iron powder is 200 mesh reduced iron powder; the molybdenum disulfide powder is 200 mesh; the high-purity chromium ferroalloy powder and tin powder are both 100 mesh; the flake graphite powder is 80 mesh; The coke powder is a powder formed after mechanical crushing and is less than 80 mesh.

[0031] To manufacture friction materials from the above materials, first Cu, Fe, Cr-Fe, MoS 2 , Sn into the V-type mixer mixing 4h, and then add coke and flake graphite mixing 2h. Put the mixed powder into a mold, and cold press with a pressure of 400MPa to make a blank. Put the cold-pressed blank into a vacuum hot-press sintering furnace, evacuate, pass argon, sinter at 930°C and keep it warm fo...

Embodiment 2

[0034] A copper-based powder metallurgy friction material containing mixed graphite, the components are as follows by mass percentage: Cu (57%), Fe (16%), Cr-Fe (12%), MoS 2 (2%), Sn (4%), coke (2%) and flake graphite (7%). Wherein, the copper powder is 200 mesh electrolytic copper powder; the iron powder is 200 mesh reduced iron powder; the molybdenum disulfide powder is 200 mesh; the high-purity chromium ferroalloy powder and tin powder are both 100 mesh; the flake graphite powder is 80 mesh; The coke powder is a powder formed after mechanical crushing and is less than 80 mesh.

[0035] To manufacture friction materials from the above materials, first Cu, Fe, Cr-Fe, MoS 2 , Sn into the V-type mixer mixing 4h, and then add coke and flake graphite mixing 2h. Put the mixed powder into a mold, and cold press with a pressure of 400MPa to make a blank. Put the cold-pressed blank into a vacuum hot-press sintering furnace, evacuate, pass argon, sinter at 930°C and keep it warm fo...

Embodiment 3

[0038] A copper-based powder metallurgy friction material containing mixed graphite, the components are as follows by mass percentage: Cu (58%), Fe (12%), Cr-Fe (16%), MoS 2 (4%), Sn (1%), coke (4.5%) and flake graphite (4.5%). Among them, copper powder is 200 mesh electrolytic copper powder; iron powder is 200 mesh reduced iron powder; molybdenum disulfide powder is 200 mesh; high-purity chromium ferroalloy powder and tin powder are both 100 mesh; It is a powder formed after mechanical crushing, less than 80 mesh.

[0039] To manufacture friction materials from the above materials, first Cu, Fe, Cr-Fe, MoS 2 , Sn into the V-type mixer mixing 4h, and then add coke and flake graphite mixing 2h. Put the mixed powder into a mold, and cold press with a pressure of 400MPa to make a blank. The cold-pressed blank was put into a vacuum hot-press sintering furnace, vacuumed, argon flowed, sintered at 950° C. and kept for 2 hours. After cooling down to below 100°C with the furnace, ...

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Abstract

The invention discloses a copper-based powder metallurgy friction material containing mixed graphite and a preparation method. The material mainly comprises Cu, Fe, Cr-Fe, MoS2, Sn, coke and crystalline flake graphite. The mass percent of each component is as follows: Cu (balance), Fe (12~16%), Cr-Fe (12~16%), MoS2 (2~4%), Sn (1~4%), coke (1 ~9%) and crystalline flake graphite (1~9%). The total amount of the coke and the crystalline flake graphite is not higher than 9%, and the coke and the crystalline flake graphite are added according to a proper proportion. The raw material powder is subjected to three steps of mixing, cold pressing and sintering to form the friction material. The copper-based friction material containing the mixed graphite provided by the invention has the characteristics of high friction coefficient and stable friction performance under the condition of high-speed braking. Due to the fact that the material contains coke, the friction vibration phenomenon in the braking process is relieved while the strength and the friction coefficient are guaranteed, the friction wear performance and the stability of the copper-based friction material are improved, and the material is particularly suitable for high-speed train brake pads.

Description

technical field [0001] The invention belongs to the technical field of friction material manufacture, and in particular relates to a copper-based powder metallurgy friction material containing mixed graphite and a preparation method thereof, in particular to a brake pad material for manufacturing high-speed trains. Background technique [0002] At present, the most widely used braking materials in high-speed trains are copper-based powder metallurgy friction materials. Most of these materials use copper as the matrix and contain abrasive phases composed of hard particles such as iron, silicon dioxide, and ferrochrome alloys, as well as graphite, Lubricating phase composed of solid lubricating particles such as molybdenum disulfide. The matrix dominates the overall properties of the material such as strength, toughness and thermal conductivity. Hard particles such as iron, silicon dioxide, and ferrochrome alloy play the role of increasing grinding. The wear-increasing phase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/00C22C1/05C22C1/10B22F3/02B22F3/10B22F3/14
CPCC22C9/00C22C1/05B22F3/02B22F3/1007B22F3/14
Inventor 樊江磊王霄郝源丰吴深王艳李莹周向葵刘建秀
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY