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Dispersion-strengthened copper-based powder metallurgy brake pad and preparation for same

A dispersion-strengthened copper and dispersion-strengthened technology, applied in mechanical equipment, friction linings, etc., can solve the problems of increased dual wear, large changes in friction coefficient, and large braking noise, and achieves good fatigue performance and wear resistance. The effect of small hardness change with temperature and comprehensive performance improvement

Active Publication Date: 2013-07-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the coefficient of friction can be increased, the wear on the pair and itself becomes larger
It can be seen that ordinary copper-based friction materials still have problems to be solved, such as wear resistance, thermal conductivity, braking distance, etc., which cannot meet the needs of high-speed trains
In addition, the brake noise is large, the friction coefficient changes greatly with the change of braking speed, the wear is serious when braking high-speed trains, and the service life is short.
This limits the speed of the vehicle

Method used

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  • Dispersion-strengthened copper-based powder metallurgy brake pad and preparation for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Will Al 2 o 3 Powder, SiO 2 Sieve the powder with 100 mesh, and sieve the remaining powder with 200 mesh, set aside;

[0026] 2. The various powders by weight ratio: 50% dispersion strengthened copper powder, 20% Fe powder, 4% C powder, 10% SiO 2 powder, 7%Sn powder, 3%Pb powder, 6%MoS 2 Pour the powder into the container and stir briefly, and a small amount of binder can be added;

[0027] 3. Pour the mixed powder into a V-shaped or double-cone mixer, add a small amount of iron wire, and take it out after mixing for 10 hours;

[0028] 4. Put the evenly mixed powder into the cold pressing mold according to the calculated weight and cold press molding, the cold pressing pressure is 2t / cm 2 , and ensure that the height of the blank after forming is consistent;

[0029] 5. Put the cold-pressed parison and the copper-plated steel back into a hot-pressed sintering furnace, heat to 700°C, pressurize and sinter under the protective atmosphere of hydrogen or nitro...

Embodiment 2

[0032] 1. Will Al 2 o 3 Powder, SiO 2 Sieve the powder with 100 mesh, and sieve the remaining powder with 200 mesh, set aside;

[0033] 2. Put various powders in weight ratio: 60% dispersion strengthened copper powder, 12% Fe powder, 12% C powder, 3% SiO2 Powder, 1%Al 2 o 3 powder, 3%Sn powder, 2%Pb powder, 7%MoS 2 Pour the powder into the container and stir briefly, and a small amount of binder can be added;

[0034] 3. Pour the mixed powder into a V-shaped or double-cone mixer, add a small amount of iron wire, and take it out after mixing for 15 hours;

[0035] 4. Put the evenly mixed powder into the cold pressing mold according to the calculated weight and cold press molding, the cold pressing pressure is 3t / cm 2 , and ensure that the height of the blank after forming is consistent;

[0036] 5. Put the cold-pressed parison and copper-plated steel back into a hot-pressed sintering furnace, heat to 800°C, pressurize and sinter under the protective atmosphere of hy...

Embodiment 3

[0039] 1. Will Al 2 o 3 Powder, SiO 2 Sieve the powder with 100 mesh, and sieve the remaining powder with 200 mesh, set aside;

[0040] 2. Put various powders in weight ratio: 70% dispersion strengthened copper powder, 5% Fe powder, 15% C powder, 1% SiO 2 Powder, 3%Al 2 o 3 powder, 1%Sn powder, 1%Pb powder, 4%MoS 2 Pour the powder into the container and stir briefly, and a small amount of binder can be added;

[0041] 3. Pour the mixed powder into a V-shaped or double-cone mixer, add a small amount of iron wire, and take it out after mixing for 20 hours;

[0042] 4. Put the evenly mixed powder into the cold pressing mold according to the calculated weight, and cold press molding, the cold pressing pressure is 4t / cm 2 , and ensure that the height of the blank after forming is consistent;

[0043] 5. Put the cold-pressed parison and the copper-plated steel back into a hot-pressed sintering furnace, heat to 900°C, pressurize and sinter under the protective atmosphere...

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Abstract

The invention discloses preparation for the brake pad of a high-speed train via a powder metallurgy method and by taking dispersion-strengthened copper as a matrix material. According to the oxide dispersion-strengthened copper, a copper matrix is strengthened by oxide dispersion particles, and the dispersion-strengthened copper chooses dispersion-strengthened copper powder in which nanometre Al2O3 is in a ratio of 0.03-5% by weight; and the formula of the brake pad comprises 50-70wt% of dispersion-strengthened copper powder, 5-20wt% of Fe powder, 4-15wt% of (flaky) C powder, 1-10wt% of SiO2 powder, 1-7wt% of Al2O3 powder, 1-7wt% of Sn powder, 1-3wt% of Pb powder, and 1-10wt% of MoS2 powder. The dispersion-strengthened copper-based brake pad is obtained by uniformly mixing the powders in a ratio, moulding by cold-pressing, then performing pressure sintering with a steel backing. Compared with the traditional copper-based brake pad, the brake pad taking the dispersion-strengthened copper as a matrix is enhanced in matrix strength, high in thermal conductivity, good in stability, good in fatigue performance and wear resistance, and less in wear on dual discs.

Description

technical field [0001] The invention belongs to the technical field of producing dispersion-strengthened copper-based high-speed train brake pads by powder metallurgy technology. In particular, it provides a brake pad preparation technology with dispersion-strengthened copper as the matrix material, which solves the problems of unstable friction coefficient and serious wear of the high-speed train brake pad. technical background [0002] It has been more than 100 years since Herbert Frood invented the first resin-based brake pad with hair and cotton thread as the reinforcing fiber in 1897. During this period, the brake material has developed rapidly with the development of science and technology. The brake material has changed from one to the other. There are many kinds of materials, and their properties are constantly improving. These materials include asbestos materials, fiber-reinforced resin-based materials, fused and cast metal materials, powder metallurgy materials, C / ...

Claims

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Application Information

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IPC IPC(8): C22C32/00C22C9/00B22F7/04F16D69/02
Inventor 郝俊杰赵翔郭志猛彭坤于潇罗骥叶青关丽红
Owner UNIV OF SCI & TECH BEIJING
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