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Carbon brush material for automobile starter and preparation method thereof

A carbon brush and material mixing technology, which is applied in the manufacture of brushes, rotating current collectors, electrical components, etc., can solve the adverse effects of motor operation and stable commutation, insufficient hardness and bending strength of carbon brush materials, and the electrical conductivity of composite materials Unfavorable effects and other issues, to achieve the effect of improving interface bonding ability, improving friction and wear performance, and increasing hardness

Active Publication Date: 2018-04-06
SHANGHAI VALEO AUTOMOTIVE ELECTRICAL SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hardness and bending strength of the carbon brush material prepared by it are still insufficient
[0005] Han Shaochang et al. changed the wettability of copper and graphite by adding Cr. Although the resistivity of the composite material was reduced to a certain extent, the degree of improvement in the wear resistance of the material was limited (see "Chromium Improves Copper and Carbon-Graphite Materials The role of wettability", Han Shaochang, Li Xueqian, Hunan University Journal, 1998(5):30-33)
[0006] In addition, the copper plating treatment of graphite has made up for the previous deficiencies to a certain extent. It not only realizes the uniform distribution of copper and graphite, but also improves the electrical conductivity, flexural strength and ductility of the composite material, but the density of the composite material decreases. Severe, resulting in insufficient carbon particles to participate in the formation of the lubricating film during the friction and wear process, which is not conducive to the stability of the commutation and the life of the carbon brush material
The degree of deformation of the copper matrix during wear can be improved by adding SiC particles, but SiC, as a ceramic phase particle, will adversely affect the electrical conductivity of the composite material; SiO 2 Although the introduction of the composite material improves the friction and wear performance of the composite material, it can introduce oxidation wear, which will also have an adverse effect on the operation and stable commutation of the motor

Method used

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  • Carbon brush material for automobile starter and preparation method thereof
  • Carbon brush material for automobile starter and preparation method thereof
  • Carbon brush material for automobile starter and preparation method thereof

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preparation example Construction

[0088] The specific embodiment part of the present invention provides a kind of preparation method of carbon brush material, described method comprises:

[0089] Dosing according to the following components:

[0090] Copper powder 60-64 parts; graphite 32-38 parts; molybdenum disulfide 3-6 parts; tin powder 1-1.5 parts; carbonyl iron powder 0.4-0.6 parts; silicon carbide 0-0.2 parts; silicon dioxide 0-0.2 parts ; 0-0.5 parts of silicon; the graphite is composed of fine graphite and colloidal graphite in a mass ratio (0.66-1.5): 1 matching composition.

[0091] Prepare carbon brushes as follows:

[0092] (1) each component is mixed according to formula quantity;

[0093] (2) pre-pressing the mixture obtained in step (1), sieving and granulating after crushing;

[0094] (3) The sample obtained after step (2) is sieved and granulated is pressed in a mould, and the blank is obtained after demoulding;

[0095] (4) Sintering the blank obtained in step (3) in a reducing atmospher...

Embodiment 1

[0098] Dosing according to the following components:

[0099] 63 parts of copper powder; 3 parts of molybdenum disulfide; 32 parts of graphite; 1 part of tin powder; 0.4 parts of carbonyl iron powder; 0.2 parts of silicon carbide; 0.1 parts of silicon dioxide; Match composition according to mass ratio 1:1.

[0100] Prepare carbon brushes as follows:

[0101] (1) Take copper powder, graphite, molybdenum disulfide, tin powder, carbonyl iron powder, silicon carbide, silicon dioxide and silicon according to the above-mentioned formula quantity for subsequent use, and mix the above-mentioned raw materials in a V-shaped mixer, adjust The rotating speed of the mixer is 35r / min, and the mixing time is 90min;

[0102] (2) Prepress the mixture obtained in step (1) for 3s under a pressure of 5Mpa, then crush and sieve and granulate to obtain a -50 mesh sample;

[0103] (3) Pour the sample after step (2) granulation into the steel mold, under the pressure of 150MPa, bidirectionally pre...

Embodiment 2

[0107] Dosing according to the following components:

[0108] 63 parts of copper powder; 6 parts of molybdenum disulfide; 38 parts of graphite; 1.5 parts of tin powder; 0.6 parts of carbonyl iron powder; 0.1 part of silicon carbide; 0.1 part of silicon dioxide; Match composition according to mass ratio 1:1.

[0109] Prepare carbon brushes as follows:

[0110] (1) Take copper powder, graphite, molybdenum disulfide, tin powder, carbonyl iron powder, silicon carbide, silicon dioxide and silicon according to the above-mentioned formula quantity for subsequent use, and mix the above-mentioned raw materials in a V-shaped mixer, adjust The rotating speed of the mixer is 45r / min, and the mixing time is 120min;

[0111] (2) pre-compress the mixture obtained in step (1) for 1s under a pressure of 10Mpa, then crush and sieve and granulate to obtain a -50 mesh sample;

[0112] (3) Pour the sample after step (2) granulation into the steel mold, under the pressure of 220MPa, bidirectiona...

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Abstract

The invention relates to an automotive starter carbon brush material and a preparation method thereof. The carbon brush material is prepared from, by mass, 60-64 parts of copper powder, 32-38 parts of graphite, 3-6 parts of molybdenum disulfide, 1-1.5 parts of tin powder, 0.4-0.6 part of carbonyl iron powder and 0-0.9 part of a friction component; and the graphite is a combination of micro-fine graphite and colloidal graphite, and the mass ratio of the micro-fine graphite to the colloidal graphite is (0.66-1.5): 1. According to the automotive starter carbon brush material and the preparation method thereof, by introducing the carbonyl iron powder to strengthen a matrix, the micro-fine graphite and the colloidal graphite in different particle sizes are selected to be matched so that the graphite distribution uniformity and the interface bonding capacity between the graphite and the matrix can be improved, a specific preparation process is used in cooperation, and the carbon brush material with good electric conductivity and abrasion resistance is obtained; and meanwhile, a carbon brush has good heat conduction performance and mechanical performance, the service life of the carbon brush is prolonged, and the application prospects are wide.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to an automobile starter carbon brush material and a preparation method thereof. Background technique [0002] Carbon brush is an important component of the motor. Its function is to conduct current between the fixed part of the motor and the rotating part of the commutator or collector ring. Its performance directly affects the normal operation of the motor. Compared with ordinary mechanical friction and wear, carbon brush materials have a variety of mechanical friction and wear mechanisms during the operation of the motor, and are accompanied by arc ablation and electrical wear. The wear conditions of automobile starter motors are complex, requiring carbon brush materials to have large current-carrying capacity, excellent reversing performance and sliding contact performance, while conventional carbon brushes will experience increased wear and severe arc ablation under high-den...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00C22C32/00C22C1/05H01R39/22H01R39/26H01R43/12
CPCC22C1/05C22C9/00C22C32/0084H01R39/22H01R39/26H01R43/12
Inventor 胡禾刘如铁张扬扬陈洁魏巍熊翔林雪杨廖宁
Owner SHANGHAI VALEO AUTOMOTIVE ELECTRICAL SYST