A kind of powder metallurgy friction material for railway passenger car and preparation method thereof

Abstract

The invention discloses a powder metallurgy friction material for railway passenger cars and a preparation method thereof, which comprises the following components by mass: 40-60 parts of copper powder, 8-20 parts of iron powder, 4-11 parts of tin powder, chromium alloy 3-8 parts of nickel powder, 3-4 parts of nickel powder, 1-3 parts of molybdenum alloy powder, 0.5-3 parts of phosphorus-iron alloy powder, 0.5-3 parts of manganese powder, 2-5 parts of titanium carbide, 2-5 parts of mullite , 1-3 parts of chromium oxide, 9-25 parts of graphite, and 1-4 parts of molybdenum disulfide. Copper powder, iron powder, tin powder, chromium alloy powder, nickel powder, manganese powder, molybdenum alloy powder and ferrophosphorus powder are mechanically alloyed, then the remaining components and binder are added for mixing; the mixture is cold pressed After forming, it can be degummed and then sintered without pressure at high temperature. The invention not only reduces the production cost of pressure sintering and restricts requirements on equipment and tooling, but also improves the continuous production efficiency and the stability of friction material performance.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy friction materials, in particular to a powder metallurgy friction material for railway passenger cars and a preparation method thereof. Background technique [0002] In 2017, China Railway Corporation launched the 160km / h concentrated power EMU (Fuxing "CR200J"). As the first Fuxing to run on the normal speed line, it runs faster than the traditional 25T railway passenger car. Higher, greater axle load. Traditional ordinary-speed trains use synthetic materials. Due to their low melting point and mechanical properties, the friction coefficient is unstable, and they are easy to carbonize and damage the brake discs during use. This is not conducive to the safe and smooth braking of the train, and it is difficult to meet the braking requirements. The core components of the concentrated power EMU with a speed of 160 kilometers per hour have realized a simplified design, and the standards and...

AI Technical Summary

Problems solved by technology

[0004] In the currently published patents, almost all powder metallurgy friction materials need to be pressure sintered, and the sintering pressure is between 0.5MPa and 5.0MPa. This sintering process has high requirements for production equipment and tooling, and there is a sintering pressure distribution. Unevenness, powder metallurgy friction materials need to be reshaped in the later stage, low production efficiency, high production cost and unstable performance, etc.