Intermetallic compound enhanced powder metallurgy friction material and preparing method and application of intermetallic compound enhanced powder metallurgy friction material

Abstract

The invention provides an intermetallic compound enhanced powder metallurgy friction material. The powder metallurgy friction material comprises 40%-60% of copper, 10%-20% of iron, 5%-10% of intermetallic compound powder, 8%-12% of ferrochromium, 5%-12% of graphite, 3%-5% of molybdenum disulfide, 1%-2% of barium sulfate, 2%-4% of silicon dioxide, 1%-3% of aluminum oxide and 2%-4% of silicon nitride. A preparing method for the intermetallic compound powder metallurgy friction material includes the steps that firstly, after all raw materials are weighed and mixed according to the proportion, a binding agent is added, and stirring is conducted; secondly, a mixture obtained in the first step is subjected to cold pressing forming; and thirdly, a pressed blank obtained in the second step is subjected to sintering treatment under the protective atmosphere, and then cooling is conducted. Intermetallic compound particles are adopted as a base reinforcement phase for the intermetallic compound powder metallurgy friction material, defects in the prior art are effectively overcome, the comprehensive performance of a braking pad is greatly improved, and especially the high-temperature friction performance, the shear strength and the wear resistance of the material are greatly improved.

Description

technical field [0001] The invention belongs to the field of friction materials, and in particular relates to an intermetallic compound powder metallurgy friction material used for high-speed train brake pads and a preparation method thereof. Background technique [0002] The development of brake pad materials for high-speed trains has mainly gone through three stages: synthetic materials, carbon materials and powder metallurgy materials. Among them, synthetic material brake pads are the earliest and longest-used braking materials, but due to their significant decline in braking performance and sharp increase in wear rate under high temperature conditions, they are no longer suitable for high-speed trains with a speed of more than 200km / h; Carbon material brake pad is a new type of friction material that has been developed in recent years. It has been widely used in civil aircraft and racing cars. It has many advantages such as small specific gravity, high strength, large mo...

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Problems solved by technology

But Al 2 o 3 The existence of the presence of copper increases the initial potential energy of the diffusion of the matrix copper, making it difficult to start the volume diffusion, hindering the vacancy flow at the sintering neck between the powder particles, delaying the growth of the sintering neck, and having a strong inhibitory effect on the sintering of copper, reducing the matrix continuity

Chinese patent CN201610632723.2 adds eutectoid steel grinding powder with pearlite structure to the matrix to develop a brake pad with stable friction coefficient and low wear. However, the pearlite structure in the grinding powder will undergo austenite transformation during sintering. Destroy the initial pearlite structure or even generate an uncontrollable unknown structure, which will have a negative impact on the overall performance of the brake

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