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

A high-speed EMU, powder metallurgy technology, applied in other manufacturing equipment/tools, mechanical equipment, engine components, etc., can solve the problems of insufficient braking force, large brake disc damage, short service life, etc., to achieve friction coefficient stability high effect

Inactive Publication Date: 2010-02-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, synthetic brake pads and powder metallurgy brake pads are mainly used for high-speed train braking. The synthetic brake pads are only used on specially designed structures due to their low operating temperature. The existing powder metallurgy brake pads have insufficient braking force, poor reliability, and use Technical defects such as short life and large damage to the brake disc

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Brake pads for CRH5 high-speed EMUs

[0020] Brake pad material components are: 5 iron, 10 graphite, 7 sea sand, 1 tin, 1 aluminum oxide, 4 iron boron, 4 molybdenum disulfide, 2 ferrosilicon, 2 silicon carbide (α), 64 copper , the above component parameters are mass percentage data.

[0021] The manufacturing process is as follows: each component is mixed evenly according to the above ratio, and then mixed with aviation kerosene and latex 1.5ml / kg. The volume ratio of aviation kerosene and latex is 4:1 and mixed evenly with a V-shaped mixer; pour the mixture into Put it into the cavity of the compression mold, and form a powder compact with a pressing pressure of 500MPa; use No. 45 steel plate with a thickness of 2.5mm to process it into a steel back, copper-plated, and the coating thickness is 10-20μm; the pressing and sintering process of the compact is as follows: heating for 3 hours , pressurize 1.0MPa in the initial stage of heating, pressurize 2.0MPa a...

Embodiment 2

[0023] Embodiment 2: Brake pads for CRH2 high-speed EMUs

[0024] Brake pad material components are: 10 iron, 12 graphite, 6 sea sand, 1 tin, 8 ferroboron, 4 molybdenum disulfide, 2 ferrosilicon, 1 aluminum oxide, 1 silicon carbide (α), 55 copper , the above component parameters are mass percentage data.

[0025] The manufacturing process is as follows:

[0026] Each component is mixed evenly according to the above ratio, then mixed with aviation kerosene and latex, and mixed evenly with a V-shaped mixer; the mixture is formed into a powder compact with a pressing pressure of 500MPa; the steel back is processed into a steel back with a No. 45 steel plate with a thickness of 2.5mm. Copper plating, coating thickness 10-20μm; pressed compact sintering process is as follows: heat up for 2 hours, pressurize 1.0MPa in the initial stage of temperature rise, pressurize 1.5MPa after 700°C, continue to heat up, keep warm after the temperature reaches 940°C, keep hold pressure 2.0 MPa,...

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PUM

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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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00B22F5/00B22F3/16
Inventor 姚萍屏熊翔汪琳白燕麟何俊
Owner CENT SOUTH UNIV
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