Enhanced aluminum matrix composite brake block

Abstract

An enhanced aluminum matrix composite brake block is made of raw materials by mixing, hot-press molding and curing processes. The raw materials include, by weight, 20-30 parts of cast aluminum alloy ZAlsi8MgBe powder, 8-10 parts of silicon carbide, 6-8 parts of potassium titanate fibers, 5-6 parts of aramid fibers, 1-2 parts of glass fibers, 5-6 parts of zirconium oxide, 3-4 parts of tetrapod-like zinc oxide whiskers, 1-2 parts of molybdenum disulfide, 1-2 parts of barium sulfate and 1-2 parts of tungsten carbide. Steel is replaced by aluminum alloy in base materials, and heat dissipation performance of the aluminum alloy is much higher than that of the common steel, so that heat generated from brake friction can be dissipated timely, the surface temperature of the brake block is lowered, heat recession under high temperature is alleviated, and wear rate is small; meanwhile, as is shown in experiments, apparent noise can hardly be heard inside a vehicle when the brake block is used with noise frequency under 450Hz.

Description

technical field [0001] The invention relates to the field of auto parts, in particular to a reinforced aluminum-based composite material brake pad. Background technique [0002] At present, the friction materials for making brake pads are mainly divided into traditional asbestos-type brake pads, metal hybrid brake pads and ceramic-based friction material brake pads. Among them, the outstanding problems of asbestos brake pads are low strength, poor thermal stability, and easy wear, which have been gradually eliminated; metal hybrid brake pads are still the main type of brake pads, and the main material is steel fiber as a reinforcing fiber. Due to the high metal content , its thermal conductivity and strength have been improved to a certain extent, but due to the better road conditions in cities and expressways, and the popularity of family cars, the good road conditions lead to faster vehicle speeds, and the brake pads bear greater stress when braking. One of the brake pads...

AI Technical Summary

Problems solved by technology

Among them, the outstanding problems of asbestos brake pads are low strength, poor thermal stability, and easy wear, which have been gradually eliminated; metal hybrid brake pads are still the main type of brake pads, and the main material is steel fiber as a reinforcing fiber. Due to the high metal content , its thermal conductivity and strength have been improved to a certain extent, but due to the better road conditions in cities and expressways, and the popularity of family cars, the good road conditions lead to faster vehicle speeds, and the brake pads bear greater stress when braking. Brake pads are noisy on the one hand, and on the other hand, due to the general heat dissipation and high surface temperature, the heat decay is obvious and the wear is serious, the service life is greatly shortened and safety accidents are prone to occur

With the rapid development of automobile technology, it has higher requirements for braking safety. Due to the lack of scientific design of material matching, the existing friction material brake pads still have high-speed degradation, high temperature degradation, stability, noise and vibration. and low service life

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