Powder metallurgy brake pad material for high speed multiple unit and preparation thereof

Abstract

The invention discloses powder metallurgy braking disc material used for the high speed train set. The powder metallurgy braking disc material is characterized in that the raw material comprises copper-based powder which is adulterated with stannum and ferroalloy component and alpha silicon carbide, all components have the following mass percent: stannum occupies 1 to 8 percent, iron occupies 1 to10 percent, copper occupies 50 to 80 percent and alpha silicon carbide occupies 1 to 3 percent. The invention also provides a process used to prepare the material, the process is characterized in that the process comprises the following steps: various powder is weighed according to the following mass percent: 4 to 10 percent of iron, 6 to 12 percent of graphite, 1 to 8 percent of sea sand, 1 to 3percent of alpha silicon carbide, 1 to 8 percent of stannum, 1 to 4 percent of alumina, 1 to 10 percent of ferroboron, 1 to 5 percent of supramoly, 2 to 8 percent of ferrosilicon, the residual is copper; after being mixed uniformly, aviation kerosene and emulsion are admixed and mixed to be uniformly; the mixture is compressed to obtain the green compact; the green compact is fixed on a supporting steel back, and thus the powder metallurgy braking disc material can be obtained through sintering. If the braking disc made by the invention is used, the service life and the braking performance can meet the braking demand of high speed train set that the speed can be up to 250 km / h and above.

Description

technical field

[0001] The invention relates to a powder metallurgy brake pad material for a high-speed EMU and a preparation process thereof. Specifically, a new copper-based powder metallurgy brake pad has been obtained. Background technique

[0002] With the deepening of the leap-forward development of my country's railways, the introduction and localization of high-speed EMUs are gradually being carried out and put into actual operation. There is no high speed without braking. Brake pads are consumable parts in the braking device of high-speed EMUs and need to be replaced regularly. Powder metallurgy brake pad material is one of the key materials in the braking device of high-speed EMUs. The kinetic energy of high-speed EMUs is converted into heat energy and other forms of energy by using the friction between the brake pad material and the matching brake disc material. , Distributed into the air, so that the braking device achieves the effect of braking.

[0003] At ...