Metal-based powder metallurgy brake pad for high-speed train and preparation method thereof

Abstract

The invention provides a metal-based powder metallurgy brake pad for a high-speed train and a manufacturing method thereof. The brake pad is made of the following raw materials: matrix components: 30-60% by weight of copper powder and 20-40% by weight of ferrous powder; lubrication components: 8-20% by weight of graphite powder and 1-5% by weight of molybdenum disulfide; friction components: 1-3% by weight of tungsten, 1-3% by weight of corundum, 1-3% by weight of silica sand and 1-3% by weight of boron carbide; friction stable components: 1-4% by weight of 80-400-mesh carbon fiber powder; and a binding material: resin occupying 1-5% of the sum of the weight of the components. The invention further comprises a manufacturing method of the metal-based powder metallurgy brake pad for the high-speed train. A friction system formed by the brake pad and machine wheels is high and stable in friction coefficient, friction coefficient fluctuation is small during braking, and reliability is high.

Description

Technical field [0001] The invention relates to a metal-based powder metallurgy brake pad for high-speed trains and a preparation method thereof, in particular to a metal-based powder metallurgy used for high-speed trains with a speed of 250km / h to 380km / h or more Brake pad and preparation method thereof. Background technique [0002] At present, there are two main types of brake pads used in railway vehicles: synthetic brake pads and powder metallurgy brake pads. High-speed train braking has a large thermal load, high temperature, unstable braking performance of synthetic brake pads, and low braking power, which cannot meet the requirements of high-speed train operation. Powder metallurgy brake pads have stable performance, good wear resistance, anti-adhesion, thermal conductivity, porosity and working reliability. Countries such as Germany, Japan, France, Italy, Sweden, Canada and other countries apply powder metallurgy brake pads to high-speed Trains and high-power locomotiv...

AI Technical Summary

Problems solved by technology

[0007] CN101602105B disclosed a copper-based powder metallurgy brake pad material on July 11, 2007, using mechanical alloy powder Cu-Sn: 10-80%, mechanical activation powder Ti-C: 1.25-15%, Ni: 0 ~10%, Cr: 0~12%, Al 2 o 3 : 2~8%, Graphite: 7.75~23%, pre-prepared mechanically alloyed powder and mechanically activated powder, TiC is formed during pre-sintering, the manufacturing process is very complicated

[0008] This formula is mainly made of copper and does not contain iron powder. It may not be compatible with the steel surface, but the instantaneous friction and high temperature of the braking surface is enough to melt and soften the low melting point phase, which will also cause sticking and adhesive wear.

With the passage of service time, the friction performance decays, and the friction coefficient of the friction material in the worn state may be greatly reduced compared with that in the new state

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