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High-speed railway brake pad friction block adopting composite material transition layer and preparation method thereof

A composite material and transition layer technology, applied in the direction of friction lining, mechanical equipment, etc., can solve the problems of the friction material and the steel back detachment, the decrease of the bonding force between the friction material and the steel back, and potential safety hazards.

Pending Publication Date: 2021-04-20
BOSUN TOOLS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the development of high-speed trains, the speed of the train is increasing day by day, the load on the brake pads increases, and the temperature generated during braking continues to rise. A large number of non-metallic elements are added to the film. These non-metallic elements reduce the bonding force between the friction material and the steel back. During the braking process, the friction material and the steel back are prone to detachment, causing major safety hazards.

Method used

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  • High-speed railway brake pad friction block adopting composite material transition layer and preparation method thereof

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preparation example Construction

[0048] A method for preparing a high-speed rail brake pad friction block using a composite material transition layer, comprising the following steps:

[0049] a. Using weighing equipment, weigh the raw materials of each material according to the weight ratio of the materials in the transition layer 2 of the composite material, put the raw materials into the three-dimensional mixer, and stir evenly. The mixing time is 0.5 to 4 hours, and the composite material transition layer is obtained. Layer mix;

[0050] b. First pour the friction material into the material cavity of the steel mould, then pour the mixed material of the transition layer of the composite material into the upper layer of the friction material in the material cavity of the steel mold, and mix the mixture of the transition layer of the composite material with the friction material The materials are pressed at the same time to obtain compacts, and the pressing pressure of cold pressing is 100-1500MPa;

[0051] ...

Embodiment example 1

[0059] Use weighing equipment, weigh raw materials according to the weight and number ratio of each material raw material of composite material transition layer 2, take 68 parts of copper powder, 28 parts of iron powder, 4 parts of calcium sulfate, put the above-mentioned raw materials in the three-dimensional mixer, Stir evenly, and the mixing time is 0.5h to obtain the mixture of the transition layer of the composite material;

[0060] Pour the friction material raw material into the material cavity of the steel mold, then pour the mixture of the transition layer of the composite material into the upper layer of the friction material in the material cavity of the steel mold, and mix the mixture of the transition layer of the composite material and the friction material at the same time Pressing to obtain a compact, the cold forming pressing pressure is 750Mpa;

[0061] The steel back 1 was placed on the compact, and pressure-sintered in a hydrogen atmosphere sintering furnac...

Embodiment example 2

[0063] Using weighing equipment, weigh the raw materials according to the ratio of the weight and number of each material in the transition layer 2 of the composite material, take 68 parts of copper powder, 30 parts of iron powder, and 2 parts of potassium titanate, and put the above raw materials into the three-dimensional mixer , stir evenly, and the mixing time is 0.5h to obtain the mixture of the transition layer of the composite material;

[0064] Pour the friction material raw material into the material cavity of the steel mold, then pour the mixture of the transition layer of the composite material into the upper layer of the friction material in the material cavity of the steel mold, and mix the mixture of the transition layer of the composite material and the friction material at the same time Pressing to obtain a compact, the cold forming pressing pressure is 300Mpa;

[0065] Place the steel back 1 on the green compact, pressurize and sinter in a hydrogen atmosphere ...

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Abstract

The invention relates to a high-speed railway brake pad friction block adopting a composite material transition layer and a preparation method of thereof. The high-speed railway brake pad friction block adopting the composite material transition layer comprises a steel backing, the composite material transition layer and a friction material which are connected in sequence, wherein the composite material transition layer and the friction material adopt the same metal elements and the same proportion, and the composite material transition layer is composed of the following raw materials of, by weight, 70-100 parts of metal powder and 1-30 parts of non-metal powder, and the non-metal powder comprises inorganic non-metal powder. The composite material transition layer is connected with the friction material and the steel backing and enables the friction material and the steel backing to be firmly combined, a small amount of inorganic nonmetal powder is added, so that the thermal expansibility of the composite material transition layer is equivalent to that of the friction material, and the influence of generating cracks due to different thermal expansibilities of the composite material transition layer and the friction material is reduced, and the risk that the friction material is separated from the steel backing in the braking process is also reduced.

Description

technical field [0001] The invention relates to a high-speed rail brake pad friction block using a composite material transition layer and a preparation method thereof, belonging to the field of powder metallurgy materials. Background technique [0002] In recent years, my country's high-speed railway has developed rapidly and achieved remarkable achievements. From 2008 to the end of 2017, in less than 10 years, my country's high-speed railway operation mileage has exceeded 26,000 kilometers, and it is expected to reach 30,000 kilometers by 2020. In order to meet the faster and safer development requirements of high-speed trains, high-speed train brake materials should have stable friction coefficient, excellent wear resistance and other characteristics. At present, powder metallurgy brake pads are used in high-speed trains with a speed of 300km / h and above. . [0003] The powder metallurgy braking material is composed of matrix components, friction components and lubricat...

Claims

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Application Information

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IPC IPC(8): F16D69/02F16D69/04
Inventor 郝文龙蒋志文刘英凯刘建刚周洋陈磊成照楠王炳杰范亚峰
Owner BOSUN TOOLS CO LTD
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