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Preparation method of powder metallurgy friction material

A friction material and powder metallurgy technology, which is applied in the field of powder metallurgy friction material preparation, can solve the problems such as the instable friction coefficient of powder metallurgy friction materials, and achieves the advantages of light weight, high tensile strength, good high temperature resistance and friction resistance. Effect

Inactive Publication Date: 2018-12-18
FOSHAN CHAOHONG NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention: Aiming at the problem that the friction coefficient of the powder metallurgy friction material developed today is not stable enough, a preparation method of the powder metallurgy friction material is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0024] Take 80g of copper powder, 20g of iron powder, 4g of chromium powder, 5g of ferrochrome powder, 15g of graphite, 2g of silicon dioxide and 20g of engine oil and fully mix them in a mixing equipment to obtain a mixture; cold press the mixture under a pressure of 400MPa , to obtain a block, repeat the preparation to obtain three green blocks; take 10g of glass fiber interweaving and laying up as a glass fiber mesh, 15g of ceramic fiber interweaving and laying up as a ceramic fiber mesh, and 5g of boron fiber interweaving and laying up as a boron fiber mesh; take the first Block the embryo block, and lay the glass fiber mesh, ceramic fiber mesh, and boron fiber mesh on the embryo block in sequence, then place the second embryo block on the mesh surface, and then place the glass fiber mesh, ceramic fiber mesh, boron fiber Lay the net on the green block in turn, cover the third green block to obtain the green block layer; stack the green block layer with the steel core layer ...

example 2

[0026] Take 120g of copper powder, 30g of iron powder, 6g of chromium powder, 8g of ferrochrome powder, 25g of graphite, 3g of silicon dioxide and 30g of engine oil and fully mix them in a mixing equipment to obtain a mixture; cold press the mixture under a pressure of 500MPa , to obtain a block, and repeat the preparation to obtain three green blocks; take 15g glass fiber interweaving and laying up to be glass fiber mesh, 25g ceramic fiber interweaving and laying up to be ceramic fiber mesh, 8g boron fiber interweaving and laying up to be boron fiber mesh; take the first Block the embryo block, and lay the glass fiber mesh, ceramic fiber mesh, and boron fiber mesh on the embryo block in sequence, then place the second embryo block on the mesh surface, and then place the glass fiber mesh, ceramic fiber mesh, boron fiber Lay the net on the green block in turn, cover the third green block to obtain the green block layer; stack the green block layer with the steel core layer or th...

example 3

[0028] Take 160g of copper powder, 40g of iron powder, 8g of chromium powder, 10g of ferrochrome powder, 30g of graphite, 4g of silicon dioxide and 40g of engine oil and fully mix them in a mixing equipment to obtain a mixture; cold press the mixture under a pressure of 600MPa , to obtain a block, repeat the preparation to obtain three green blocks; take 20g of glass fiber interweaving and laying up to be a glass fiber net, 30g of ceramic fiber interweaving and laying up to be a ceramic fiber net, and 10g of boron fiber to be interwoven and laying up to be a boron fiber net; take the first Block the embryo block, and lay the glass fiber mesh, ceramic fiber mesh, and boron fiber mesh on the embryo block in sequence, then place the second embryo block on the mesh surface, and then place the glass fiber mesh, ceramic fiber mesh, boron fiber Lay the net on the green block in turn, cover the third green block to obtain the green block layer; stack the green block layer and the steel...

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Abstract

The invention relates to a preparation method of a powder metallurgy friction material, and belongs to the technical field of material processing. The invention is formed in the manner that copper andiron serve as matrix components, chromium and ferrochrome powder serve as friction components, graphite and silica serve as lubricating components, and three kinds of fiber materials are used for hybrid reinforcing; the three kinds of fiber materials have complementary advantages and can improve the high temperature resistance and abrasive resistance of the friction materials; in the sintering process, as the temperature gradually increases, glass fibers gradually become molten and are adhered to a ceramic fiber mesh and a boron fiber mesh, and the three kinds of fiber materials are mixed inthe friction material to form a three-dimensional network structure, and therefore the impact force borne by the friction material can be dispersed and reduced, the mechanical properties of the friction material can be improved, and the friction coefficient is more stable; and since the ceramic fibers have the characteristic of the small specific heat, the rising rate of the temperature of the friction material during braking is reduced, the volume change caused by rapid increase of temperature is avoided, and the stability of the friction material is further improved.

Description

technical field [0001] The invention relates to a preparation method of a powder metallurgy friction material, which belongs to the technical field of material processing. Background technique [0002] Brake pads are key braking components that determine train speed, emergency braking capacity, and ensure safe operation. In order to ensure the safe operation of high-speed trains, brake pads are required to have: (1) High stability of friction coefficient. In the case of high temperature, pressure and speed, the coefficient of friction of the brake pad is required to be high enough and have sufficient stability. The instantaneous value and average value of the coefficient of friction measured on the test bench shall be within the range of each corresponding tolerance zone. When the brake is running in, the change of the friction coefficient of the brake pad shall not exceed ±15% of the value obtained under the same conditions after the running in is completed. When other c...

Claims

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Application Information

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IPC IPC(8): C22C47/20B22F1/00B22F7/08C22C49/02C22C49/14
Inventor 刘菊花周立骆兵建
Owner FOSHAN CHAOHONG NEW MATERIAL TECH CO LTD
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