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Graphite brush and preparation method thereof

A graphite brush and graphite technology, applied in brush manufacturing, circuits, current collectors and other directions, can solve the problems of insufficiency, performance differences and imperfect processes, friction and wear commutation performance can not be coordinated and unified, etc., to reduce contact resistance, The effect of improving the service life and high thermal conductivity

Inactive Publication Date: 2010-02-17
JOHNSON ELECTRIC SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the performance difference between graphite and the binder and the imperfection of the process, the performance of the graphite brush is affected and cannot meet the requirements of certain environments.
At the same time, there is a contradiction between proper resistivity, excellent friction and wear, and good commutation performance, which cannot meet the actual needs well.

Method used

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  • Graphite brush and preparation method thereof

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Embodiment Construction

[0011] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0012] see figure 1 According to an embodiment of the present invention, the carbon nanotube reinforced graphite electric brush is mainly composed of graphite 1, binder 2, carbon nanotubes 3 mixed in the graphite 1 and binder 2, and copper wire (not shown in the figure). shown) composition. In this embodiment, the adhesive 2 can be epoxy resin or phenolic resin. Understandably, other binders can also be used according to the specific performance requirements of the actual brush. The carbon nanotubes have a diameter of about 20-30 nm and a length of about 30 μm.

[0013] As can be seen from the figure, the carbon nanotubes 3 mixed in the graphite 1 and the binder 2 can increase the electrical conduction and heat conduction paths of the brush (as shown by the dotted line in the figure), thereby greatly improving the electric resistance of the brush. thermal...

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Abstract

The invention discloses a graphite brush, which comprises graphite, resin, carbon nano tubes which are mixed in the graphite and the resin, and a copper wire. The invention also provides a method forpreparing the graphite brush, which comprises the following steps of: performing surface treatment on the carbon nano tubes; adding the carbon nano tubes into solvent for pre-dispersion; slowly addingthe carbon nano tube suspension into resin solution for dispersion; mixing the resin solution containing the carbon nano tubes with the graphite and an additive; cold pressing and sintering the mixture to prepare a blank; and fixedly connecting a lead in the solidified and sintered blank to prepare the brush. Due to the fact that the carbon nano tubes are added in the graphite brush, the graphitebrush of the invention has high thermal conductivity, carrier density and abrasion resistance, can effectively reduce the contact resistance between the brush and a commutator to prolong the servicelife.

Description

technical field [0001] The invention relates to a graphite electric brush and a preparation method thereof. Background technique [0002] The brush is a sliding contact body used in conjunction with the commutator to realize the commutation of the motor current. The reliability of the motor operation depends to a large extent on the performance of the brush. [0003] Graphite brushes have the advantages of good commutation performance, simple manufacturing process, short production cycle, and easy mass production. However, due to the addition of resin, the thermal conductivity and electrical conductivity of the brush are reduced, the contact resistance is increased, and the current-carrying density is reduced. When the brush heats up due to friction, the lubricating performance of the brush itself decreases, further increasing the temperature. In addition, due to the performance difference between graphite and the binder and the imperfection of the process, the performance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01R39/20H01R43/12
Inventor 晏义伍李家麟刘大勇阮昌荣
Owner JOHNSON ELECTRIC SHENZHEN
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