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A connection method of copper-based powder metallurgy friction material and steel back

A technology of powder metallurgy and friction materials, applied in the direction of friction linings, mechanical equipment, etc., to increase the bonding strength, make up for the difference in thermal expansion performance, and achieve the effect of firm and reliable bonding

Active Publication Date: 2016-01-20
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two situations are suitable for the anti-friction and wear-resistant materials with a thin working layer, but not for the preparation of friction brake materials with a thick friction layer.

Method used

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  • A connection method of copper-based powder metallurgy friction material and steel back

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Put 85% ultra-fine copper powder and 15% ultra-fine iron powder into a high-speed mixer and mix evenly; take the mixed metal powder as the solid phase, and mix the metal with the ratio of 30% solid content and 70% organic solvent. Powder and organic solvent, and uniformly dispersed in an ultrasonic disperser. The dispersed mixed solution is poured into the spray gun storage tank for use; the surface of the steel back to be used is wiped with absolute ethanol to decontaminate, after natural drying, spray a layer of mixed solution evenly with a spray gun within the range of 15-20cm from the steel back surface, After natural drying, the thickness of the transition layer is 0.3mm; after spraying, the steel back and the friction body are jointly pressed and sintered. After testing, the bonding strength of the friction body and the steel back is 16.7Mpa.

Embodiment 2

[0016] Put 89% ultra-fine copper powder and 11% ultra-fine iron powder into a high-speed mixer and mix evenly; take the mixed metal powder as the solid phase, and mix the metal with a solid content of 35% and an organic solvent of 65%. Powder and organic solvent, and uniformly dispersed in an ultrasonic disperser. The dispersed mixed solution is poured into the spray gun storage tank for use; the surface of the steel back to be used is wiped with absolute ethanol to decontaminate, after natural drying, spray a layer of mixed solution evenly with a spray gun within the range of 15-20cm from the steel back surface, After natural drying, repeat the spraying again. After drying, the thickness of the transition layer is 0.7mm; after spraying, the steel back and the friction body are jointly pressed and sintered. After testing, the bonding strength of the friction body and the steel back is 21.5Mpa.

Embodiment 3

[0018] Put 90% ultra-fine copper powder and 10% ultra-fine iron powder into a high-speed mixer and mix evenly; take the mixed metal powder as the solid phase, and mix the metal with a ratio of 40% solid content and 60% organic solvent. Powder and organic solvent, and uniformly dispersed in an ultrasonic disperser. The dispersed mixed solution is poured into the spray gun storage tank for use; the surface of the steel back to be used is wiped with absolute ethanol to decontaminate, after natural drying, spray a layer of mixed solution evenly with a spray gun within the range of 15-20cm from the steel back surface, After natural drying, repeat the spraying twice. After drying, the thickness of the transition layer is 1mm. After spraying, the steel back and the friction body are pressed and sintered together. After testing, the bonding strength of the friction body and the steel back is 38Mpa.

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Abstract

The invention relates to a connection method for a copper-based powder metallurgy composite friction material and a brake lining steel backing of a high-speed train, belonging to the field of train brake systems. The connection method is characterized in that a transition layer is sprayed on a contact plane of the steel backing and the copper-based composite friction material. The connection method is also characterized in that the transition layer consists of mixed metal powder and an organic solvent and can be sprayed at the normal temperature, wherein the operation is easy and convenient, the thickness is 0.3-1.2 mm after quick drying, and the content of the mixed metal powder in the dry layer can reach 50 percent. According to the connection method, the problem of mismatching of thermal expansion performances of the composite friction material and the steel backing is effectively alleviated, and the binding strength of the composite friction material and the steel backing is obviously improved. The connection method has great advantage for improving the reliability of the brake system and the running safety.

Description

technical field [0001] The invention relates to a connection method between a copper-based powder metallurgy friction material and a steel back for a high-speed train, and belongs to the field of train braking systems. technical background [0002] Copper-based composite friction material refers to the material for friction and braking with the brake disc. The main body is copper powder, and various friction adjustment components such as alloy powder, ceramic powder, and lubricating powder are added. Through the technological process, a composite friction material with high stability of friction coefficient, good thermal conductivity, high heat capacity, high temperature resistance, and rain and snow resistance is made. The friction material (friction body) is connected with the steel back that acts as a strength support to form a friction block, and the friction block is connected to the assembly back plate through a steel connector with a special structure, and finally for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16D69/04
Inventor 燕青芝王晔
Owner UNIV OF SCI & TECH BEIJING
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