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Gradient friction body for high-speed train braking and preparation method thereof

A technology for high-speed trains and friction bodies, applied in the field of powder metallurgy materials, can solve the problems of increased wear, shortened life, performance degradation, etc., to achieve the effects of extending service life, small edge drop and corner drop, and stable mechanical properties and friction properties.

Active Publication Date: 2020-01-14
BEIJING TIANRENDAOHE NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the technical problems of performance degradation, increased wear and shortened life of the homogeneous powder metallurgy friction material for high-speed train braking in the prior art during use, and to provide a friction material with stable friction performance. Gradient friction body for high-speed train braking and preparation method of friction material

Method used

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  • Gradient friction body for high-speed train braking and preparation method thereof
  • Gradient friction body for high-speed train braking and preparation method thereof
  • Gradient friction body for high-speed train braking and preparation method thereof

Examples

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Embodiment 1

[0029] This embodiment provides a gradient friction body for high-speed train braking. 1 part by weight (5kg) of raw materials includes the following components: 2000g of copper powder with a particle size range of 20-40um, and 1750g of iron powder with a particle size range of 5-20um. , 350g of graphite with a particle size range of 200-300um, 350g of molybdenum disulfide with a particle size range of 300-400um, 250g of silicon carbide with a particle size range of 10-20um, and 300g of silicon dioxide with a particle size range of 20-30um.

[0030] In this embodiment, the thickness of the gradient friction material for high-speed train braking is 20 mm.

[0031] Weigh the raw materials according to the above weight, mix them, add the mixed raw materials into the mold, place the mold in the center of the electromagnetic induction device, and the magnetic field device applies a magnetic field to the raw materials, the magnetic field size is 0.2T, and the action time is 30s; The...

Embodiment 2

[0033] This embodiment provides a gradient friction body for high-speed train braking. 1 part by weight (5kg) of raw materials includes the following components: 2400g of copper powder with a particle size range of 30-50um, and 1000g of iron powder with a particle size range of 20-30um. , 150g of graphite with a particle size range of 400-500um, 200g of molybdenum disulfide with a particle size range of 500-600um, 650g of silicon carbide with a particle size range of 30-40um, and 600g of silicon dioxide with a particle size range of 40-50um.

[0034] In this embodiment, the thickness of the gradient friction material for high-speed train braking is 30mm.

[0035] Weigh the raw materials according to the above weight, mix them, add the mixed raw materials into the mold, put the mold in the center of the electromagnetic induction device, and the magnetic field device applies a magnetic field to the raw materials, the magnetic field size is 0.4T, and the action time is 25s; The r...

Embodiment 3

[0037]This embodiment provides a gradient friction body for high-speed train braking. 1 part by weight (5kg) of raw materials includes the following components by weight: 3000g of copper powder with a particle size range of 40-60um, and 600g of iron powder with a particle size range of 30-50um , 350g of graphite with a particle size range of 700-800um, 400g of molybdenum disulfide with a particle size range of 750-850um, 300g of silicon carbide with a particle size range of 40-50um, and 350g of silicon dioxide with a particle size range of 55-65um.

[0038] In this embodiment, the thickness of the gradient friction material for high-speed train braking is 25mm.

[0039] Weigh the raw materials according to the above weight, mix them, add the mixed raw materials into the mold, place the mold in the center of the electromagnetic induction device, and the magnetic field device applies a magnetic field to the raw materials, the magnetic field size is 0.6T, and the action time is 20...

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Abstract

The invention relates to the technical field of brake materials, in particular to a gradient friction body for high-speed train braking and a preparation method thereof; A magnetic field of 0.2-0.8T acts for 5-30s to make the weight percentage of the iron component in the gradient friction body for high-speed train braking of the present invention change gradiently and / or continuously along the thickness direction. In the initial stage of use, all aspects of performance are just right. Suitable, with the prolongation of the use time, the iron content increases to make up for a part of the loss of friction performance, the wear will not change significantly, the friction coefficient is stable, the safety hazards such as falling edges and corners are small, and the service life is longer. Its preparation method Simple, easy to industrialize and good in practicability.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy materials, in particular to a gradient friction body for high-speed train braking and a preparation method thereof. Background technique [0002] With the vigorous development of my country's high-speed railway construction, the operating speed of trains will continue to increase, and the service conditions will be more stringent, which puts forward higher requirements for the comprehensive performance of train brake pads. Copper-based powder metallurgy friction materials have good thermal conductivity and are not easy to bond with cast iron brake discs during braking. They are widely used as friction materials for high-speed train braking. The main components of copper-based powder metallurgy friction materials usually include matrix components Elemental copper, reinforced components such as iron, chromium, ferrochrome, etc., also need to add molybdenum disulfide and graphite as lubrica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C1/05C22C9/00C22C30/02B22F1/00
CPCC22C1/05C22C9/00C22C30/02B22F1/105B22F1/14
Inventor 吴佩芳释加才让李发长曹静武胡晨程景琳
Owner BEIJING TIANRENDAOHE NEW MATERIAL CO LTD