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A powder metallurgy brake pad matched with a carbon-ceramic brake disc and its preparation method

A technology of carbon-ceramic brake discs and brake pads, applied in metal processing equipment, friction linings, mechanical equipment, etc., to achieve significant economic and environmental benefits, fast heating, and high melting point

Active Publication Date: 2021-11-12
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These cannot be matched with carbon ceramic discs for high-speed train braking

Method used

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  • A powder metallurgy brake pad matched with a carbon-ceramic brake disc and its preparation method
  • A powder metallurgy brake pad matched with a carbon-ceramic brake disc and its preparation method
  • A powder metallurgy brake pad matched with a carbon-ceramic brake disc and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. A powder metallurgy brake pad matched with a carbon ceramic brake disc, including the following components:

[0034] Iron powder: 50 parts by weight; copper powder: 15 parts by weight; flake graphite, 9 parts by weight; graphene: 0.4 parts by weight; ferrous sulfide powder: 8 parts by weight; spherical mixed hard powder: 17.6 parts by weight;

[0035] The spherical hard metal powder includes chromium powder: 3 parts by weight; molybdenum powder: 3 parts by weight; ferrochrome powder: 4 parts by weight; ferromolybdenum powder: 4 parts by weight.

[0036] The spherical ceramic powder includes silicon carbide: 3 parts by weight; titanium dioxide: 0.6 parts by weight.

[0037] 2. Pour the above-mentioned raw material powder into the double-cone mixer except graphene, and the mixing cylinder rotates continuously to stir the material at a speed of 120 rpm, and the powder particles are dispersed in the mixing cylinder; add graphene to ethanol, The addition of graphene is 2...

Embodiment 2

[0042] 1. A powder metallurgy brake pad matched with a carbon ceramic brake disc, including the following components:

[0043] Iron powder: 55 parts by weight; Copper powder: 12 parts by weight; Flake graphite, 12 parts by weight; Graphene: 0.5 parts by weight; Ferrous sulfide powder: 7 parts by weight; Spherical mixed hard powder: 13.5 parts by weight;

[0044] The spherical hard metal powder includes chromium powder: 2 parts by weight; molybdenum powder: 2 parts by weight; ferrochrome powder: 3 parts by weight; ferromolybdenum powder: 3 parts by weight.

[0045] The spherical ceramic powder includes silicon carbide: 2.5 parts by weight; titanium dioxide: 0.5 parts by weight.

[0046] 2. Pour the above-mentioned raw material powder into the double-cone mixer except graphene, and the mixing cylinder rotates continuously to stir the material at a speed of 120 rpm, and the powder particles are dispersed in the mixing cylinder; add graphene to ethanol, The addition of graphene i...

Embodiment 3

[0051] 1. A powder metallurgy brake pad matched with a carbon ceramic brake disc, including the following components:

[0052] Iron powder: 45 parts by weight; Copper powder: 18 parts by weight; Flake graphite, 8 parts by weight; Graphene: 0.3 parts by weight; Ferrous sulfide powder: 10 parts by weight; Spherical mixed hard powder: 18.7 parts by weight;

[0053] The spherical hard metal powder includes chromium powder: 2.1 parts by weight; molybdenum powder: 2.1 parts by weight; ferrochrome powder: 5 parts by weight; ferromolybdenum powder: 5 parts by weight.

[0054] The spherical ceramic powder includes silicon carbide: 3.5 parts by weight; titanium dioxide: 1 part by weight.

[0055] 2. Pour the above-mentioned raw material powder into the double-cone mixer except graphene, and the mixing cylinder rotates continuously to stir the material at a speed of 120 rpm, and the powder particles are dispersed in the mixing cylinder; add graphene to ethanol, The addition of graphene ...

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Abstract

A powder metallurgy brake pad matched with a carbon ceramic disc and a preparation method thereof, the components include iron powder, copper powder, flake graphite, graphene, ferrous sulfide powder, spherical chromium powder, molybdenum powder, ferrochrome powder, Molybdenum ferroalloy powder, silicon carbide and titanium dioxide. The prepared iron-based brake pad is made by mixing powder, pressing and sintering under oscillating pressure. Its outstanding advantages include: (1) iron powder has high strength, wide source and low price; (2) graphene is evenly distributed in The matrix reacts with iron to form pearlite to further increase the matrix strength and improve the stability of the friction coefficient and wear resistance at high temperature; (3) The spherical hard particles are well bonded to the iron matrix interface and have less damage to the carbon ceramic disc. The copper-based brake pad prepared by this method can be matched with the carbon ceramic disc to provide a stable and high friction coefficient at high speed, low wear and prolong the service life of the brake disc, and it is easy to prepare and low in price, and can be applied Braking systems for high-speed railway trains with speeds up to 350km / h and above.

Description

technical field [0001] The invention belongs to the technical field of producing high-speed train brake pads by powder metallurgy technology, and in particular provides a powder metallurgy brake pad matched with a carbon ceramic disc. Background technique [0002] The brake device that is widely used in high-speed trains is mainly a brake pair matched by alloy steel discs and copper-based brake pads. In the case of failure of other auxiliary braking methods or emergency braking, the braking of the train is mainly carried out by means of copper-based brake pads locking alloy steel brake discs. This is mainly due to the use of copper's excellent thermal conductivity, ease of processing and wide source of raw materials. However, with the increase of train braking speed and load, higher heat (instantaneous temperature may be as high as 1000°C) and greater stress will appear at the friction interface during the friction process. Under the joint action of the two, the copper mat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00C22C33/02B22F3/14F16D69/02C22C38/20C22C38/22C22C38/42C22C38/44
CPCC22C33/0221C22C33/0228B22F3/14F16D69/027C22C38/20C22C38/22C22C38/42C22C38/44F16D2200/0008F16D2200/0034F16D2200/0052F16D2200/0086B22F1/105
Inventor 曲选辉张鹏章林
Owner UNIV OF SCI & TECH BEIJING
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