Friction material for brake-shoe of heavy axle-load wagon and preparation method of friction material

Abstract

The invention discloses a friction material for a brake-shoe of a heavy axle-load wagon. The friction material is prepared from the following components in percentage by mass: 6-12 percent of nitrile rubber, 1-4 percent of butadiene styrene rubber, 3-8 percent of A-stage phenolic resin, 0.4-1 percent of insoluble sulfur, 0.1-0.6 percent of an accelerant, 0.1-0.6 part of a curing agent, 2-6 percent of carbon black, 8-18 percent of barite, 1-4 percent of kyanite, 17-40 percent of hybrid fibers, 7-14 percent of magnesium oxide, 2-6 percent of petroleum coke, 2-8 percent of calcium sulfate crystal whiskers, 1-4 percent of molybdenum disulfide, 1-5 percent of crystalline flake graphite, 1-4 percent of artificial graphite, 1-4 percent of mica iron oxide and 1-3 percent of antimony sulfide. The friction material can satisfy the friction performance and mechanical property required by the brake-shoe of the heavy axle-load wagon and can meet the high speed operating requirement on heavy load of the wagon.

Description

technical field [0001] The invention relates to the technical field of brake shoes for railway freight cars, in particular to a friction material and a preparation method for brake shoes for large-axle-load freight cars. Background technique [0002] At present, the railway is the main artery of the national economy and the important infrastructure of the country. In recent years, my country's railway industry has achieved leapfrog development. Among them, railway freight cars are developing towards high speed and heavy load. The increase of axle load and speed have put forward higher requirements for train braking materials. Brake shoes for freight car braking should have high mechanical strength and good heat resistance. and thermal conductivity, stable friction performance, lower wear and reduced wear and thermal damage to the wheel. However, at present, the friction materials used in domestic truck brake shoes can only meet the braking requirements of trucks with an axl...

AI Technical Summary

Problems solved by technology

However, under the condition of heavy load and high-speed running of railway freight cars, such as the weight of railway freight cars is higher than 100 tons and the speed is greater than 100 kilometers per hour, when braking, a large braking force is required, which affects the temperature resistance and mechanical properties of the brake shoes. There are high requirements for strength. The existing brake shoes made of resin as the main bonding system have problems such as insufficient friction performance, easy breakage of the friction body, loss of blocks, serious metal inlays, etc., which may easily cause wheel scratches and heat damage. It even endangers driving safety and cannot meet the braking requirements of existing heavy-duty, high-speed and large-axle-load railway wagons

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