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Metal matrix composite material brake pad and preparation method thereof

A technology of composite materials and brake pads, which is applied in the direction of mechanical equipment, friction linings, gear transmission mechanisms, etc., can solve the problem of not meeting the requirements of limiting element content, many scratches on the surface of the brake disc, plowing, braking The problem of large wear on the surface of the disk can be solved, and the effect of stable friction performance, small fluctuation of friction coefficient and low wear amount can be achieved

Active Publication Date: 2021-07-13
上海连纵轨道交通科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above formula is mainly copper, contains eutectoid steel grinding powder, and the friction component is mainly silicon dioxide; although the brake pads prepared with this formula have the characteristics of high friction coefficient and low wear under high-speed braking conditions, However, due to the high content of hard particle silica, the brake pads have a greater wear on the surface of the brake disc, and with the passage of service time, more scratches, furrows, etc. will occur on the surface of the brake disc. damage
Moreover, the silicon dioxide content in the above formula is as high as 4-6 parts by weight, which cannot meet the requirements on the content of restricted elements in the standard TJ / CL307-2019 "Temporary Technical Conditions for Brake Plates of EMUs"

Method used

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  • Metal matrix composite material brake pad and preparation method thereof
  • Metal matrix composite material brake pad and preparation method thereof
  • Metal matrix composite material brake pad and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The metal matrix composite material brake pad in this embodiment includes the following raw material components:

[0032] Metal powder: 35 parts by weight of copper powder, 13 parts by weight of iron powder, 10 parts by weight of ferrochromium powder, 10 parts by weight of zircon sand, 1 part by weight of ferroboron powder, 5 parts by weight of ferromolybdenum powder, 0.5 parts by weight of tungsten powder, disulfide 3 parts by weight of molybdenum powder;

[0033] Non-metallic powder: 5 parts by weight of natural granular graphite, 8 parts by weight of natural flake graphite, and 1 part by weight of artificial granular graphite;

[0034] Nano copper wire: 10 parts by weight.

[0035] The copper powder is electrolytic copper powder with a particle size of 45-75 μm.

[0036] The iron powder is reduced iron powder with a purity of ≥98% and a particle size of 45-75 μm.

[0037] The ferrochrome powder is a medium-carbon ferrochrome powder, wherein the chromium content is...

Embodiment 2

[0049] The metal matrix composite material brake pad in this embodiment includes the following raw material components:

[0050] Metal powder: 45 parts by weight of copper powder, 10 parts by weight of iron powder, 12 parts by weight of ferrochrome powder, 3 parts by weight of zircon sand, 3 parts by weight of ferroboron powder, 1 part by weight of ferromolybdenum powder, 1.5 parts by weight of tungsten powder, disulfide 0.5 parts by weight of molybdenum powder;

[0051] Non-metallic powder: 15 parts by weight of natural granular graphite, 1 part by weight of natural flake graphite, and 3 parts by weight of artificial granular graphite;

[0052] Nano copper wire: 5 parts by weight.

[0053] The copper powder is reduced copper powder with a particle size of 45-75 μm.

[0054] The iron powder is reduced iron powder with a purity of ≥98% and a particle size of 45-75 μm.

[0055] The ferrochrome powder is a high-carbon ferrochrome powder, wherein the chromium content is 72%, th...

Embodiment 3

[0067] The metal matrix composite material brake pad in this embodiment includes the following raw material components:

[0068] Metal powder: 40 parts by weight of copper powder, 6 parts by weight of iron powder, 15 parts by weight of ferrochrome powder, 6 parts by weight of zircon sand, 5 parts by weight of ferroboron powder, 3 parts by weight of ferromolybdenum powder, 1.0 parts by weight of tungsten powder, disulfide 1.5 parts by weight of molybdenum powder;

[0069] Non-metallic powder: 10 parts by weight of natural granular graphite, 3 parts by weight of natural flake graphite, and 5 parts by weight of artificial granular graphite;

[0070] Nano copper wire: 8 parts by weight.

[0071] The copper powder is water atomized copper powder with a particle size of 45-75 μm.

[0072] The iron powder is reduced iron powder with a purity of ≥98% and a particle size of 45-75 μm.

[0073] The ferrochrome powder is high-carbon ferrochrome powder, wherein the chromium content is 6...

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Abstract

The invention provides a metal matrix composite brake pad and a preparation method thereof, and belongs to the technical field of brake pad manufacturing. The raw material formula of the brake pad comprises the following components of metal powder, non-metal powder and copper nanowires. The metal powder includes copper powder, iron powder, ferrochromium powder, zircon sand, ferroboron powder, ferromolybdenum powder, tungsten powder and molybdenum disulfide powder; the non-metal powder comprises natural granular graphite, natural flaky graphite and artificial granular graphite. All the raw material components are fully mixed and then are subjected to compression molding, and an obtained blank is subjected to hot pressing sintering and isothermal cooling to obtain the brake pad. The brake pad is good in friction coefficient stability and low in material wear rate; and the heat-conducting property of the material is good, adhesion of the friction material on a brake disc in the braking process can be effectively reduced, and less damage is caused to the brake disc.

Description

technical field [0001] The invention relates to the manufacturing technology of brake pads, in particular to a metal-based composite material brake pad and a preparation method thereof, belonging to the technical field of high-speed train brake equipment manufacturing and production. Background technique [0002] At present, copper-based powder metallurgy brake pads are widely used in high-speed train brake pads. With the rapid development of China's high-speed rail, the braking speed is gradually increasing, and the braking load is increasing; the working temperature and stress on the surface of copper-based powder metallurgy brake pads are gradually increasing. According to the requirements of the "Special Test Outline for EMU New Brake Application Assessment Emergency Braking", when a train running at a speed of 300km / h brakes in an emergency, the friction braking system must be able to stop the train within a braking distance of 3800m. Huge kinetic energy is consumed du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F5/00B22F1/00B22F3/02B22F3/14F16D69/02
CPCB22F1/0003B22F5/00B22F3/02B22F3/14F16D69/027F16D2200/0086F16D2200/0008F16D2200/0026F16D2200/0034F16D2200/0052B22F2998/10
Inventor 罗明良
Owner 上海连纵轨道交通科技有限公司