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Brush in composite material of carbon fiber and graphite based on silver

A composite material and carbon fiber technology, applied in the direction of circuits, current collectors, electrical components, etc., can solve the problems of electrical conductivity, strength and wear resistance that are difficult to meet the performance requirements, long service life requirements, and single performance requirements, so as to improve electrical properties. and mechanical properties, friction and wear properties, and the effect of increasing the current-carrying density

Inactive Publication Date: 2006-12-06
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As a component of the motor commutator, the brush has traditionally had relatively simple performance requirements, but with the continuous expansion of the application field of the brush, especially the brush used in aerospace vehicles, launch vehicles and signal monitoring systems, it has a working Due to the characteristics of harsh environment, difficult maintenance, high performance requirements and long service life requirements, the conductivity, strength and wear resistance of traditional silver (copper)-graphite have been difficult to meet the performance requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The carbon fiber graphite silver-based composite electric brush comprises the following raw materials in parts by weight:

[0023] 400 mesh silver powder with 99.99% silver content 60-90

[0024] 400 mesh copper powder with 99.99% copper content 10-30

[0025] 320 mesh graphite with a carbon content greater than 99.85% 5-15

[0026] Surface copper-plated carbon fiber 1-3

[0027] Mix the above raw materials evenly, add an organic binder according to the routine, press and shape under the conditions of pressure 200-300Mpa, time 12-20 seconds, and then sinter and machine to get the brush product.

[0028] The copper-plated carbon fiber is the outer layer of the carbon fiber is a copper-plated material layer. The length of the copper-coated carbon fiber on the surface is 0.1 mm, the average diameter is 7 μm, and the thickness of the copper plating is 0.5 μm.

Embodiment 2

[0030] The carbon fiber graphite silver-based composite electric brush comprises the following raw materials in parts by weight:

[0031] 400 mesh silver powder with 99.99% silver content 90

[0032] 400 mesh copper powder with 99.99% copper content 30

[0033] 320 mesh graphite with a carbon content greater than 99.85% 15

[0034] Copper-coated carbon fiber 3

[0035] The length of the copper-coated carbon fiber on the surface is 0.45 mm, the average diameter is 7.5 μm, and the thickness of copper plating is 0.75 μm.

[0036] Others are with embodiment 1.

Embodiment 3

[0038] The carbon fiber graphite silver-based composite electric brush comprises the following raw materials in parts by weight:

[0039] 400 mesh silver powder with 99.99% silver content 75

[0040] 400 mesh copper powder with 99.99% copper content 20

[0041] 320 mesh graphite with a carbon content greater than 99.85% 8

[0042] Copper-plated carbon fiber 2

[0043] The length of the copper-coated carbon fiber on the surface is 1 mm, the average diameter is 8 μm, and the thickness of the copper plating is 2 μm.

[0044] Others are with embodiment 1.

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PUM

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Abstract

Being related to electric contact material, i.e. brush, the invention discloses brush prepared from carbon fiber, graphite, silver based composite material in optimal adaptation among conduction, intensity, and wear resistance. Characters are that raw materials of the brush include silver powder, copper powder, graphite, and copper coated carbon fiber. Comparing with products in same domestic designation, the disclosed product increases performance of frictional wear remarkably, and raises service life to 2-3 times. Controlling pressure, and pressing time, the invention controls falling over direction of carbon fiber so as to low resistivity of brush, and increase density of carrying current. The invention raises electrical and mechanical performances of composite material (resistivity 0.06-0.09 micro ohm .m), and manufactures moderated, stable thickness of oxide film on surface of collector ring.

Description

technical field [0001] The present invention relates to an electrical contact material, in particular a brush. Background technique [0002] A brush is an electrical material as well as an electrical contact material. As an important functional part, it is responsible for the current and signal transmission between the moving parts and the fixed parts in the bus ring (collector ring) and the commutator. It is required that the brush material has good electrical conductivity, thermal conductivity, wear resistance and certain strength requirements. [0003] As a component of the motor commutator, the brush has traditionally had relatively simple performance requirements, but with the continuous expansion of the application field of the brush, especially the brush used in aerospace vehicles, launch vehicles and signal monitoring systems, it has a working Due to the harsh environment, difficult maintenance, high performance requirements and long service life, the conductivity,...

Claims

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Application Information

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IPC IPC(8): H01R39/20H01R43/12B22F3/16
Inventor 王成福宗跃吴玉程王文芳
Owner HEFEI UNIV OF TECH
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