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Low-temperature brazing method of graphite-copper composite structural commutator

A technology of composite structure and brazing method, which is applied in the direction of commutator manufacturing, welding/welding connection, circuit/collector parts, etc., which can solve the problems of easy falling off, low bonding strength between metal coating and graphite disc, and copper commutating blades. Softening and other problems, to achieve the effect of improving the connection strength, convenient implementation, and reducing the brazing temperature

Inactive Publication Date: 2015-06-10
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a new type of graphite-copper composite structure commutator brazing process in order to solve the softening phenomenon of copper reversing blades and the low bonding strength of the metal coating and graphite disc, easy to fall off, etc. Low temperature brazing method for commutator with copper composite structure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A low-temperature brazing method for a graphite-copper composite structure commutator, the steps are as follows: 1. Prepare materials: SnCr metal powder is composed of 70-98% Sn powder and 2-30% Cr powder by weight percentage, wherein the metal used The chemical powder is composed of simple metal, the mass purity is 95~99.95%, and the particle size is 10~100μm; ball milling: put the weighed Sn powder and Cr powder into the ball mill tank together, and the ball-to-material ratio is 5~12︰1 , the filler ratio is 50%~60%; fill with argon gas after vacuuming, and then intermittently ball mill for 5~10 hours at a speed of 100~200r / min; after ball milling, take out the balls; two metallization: prepare A good SnCr metallized powder is coated on the surface of the graphite disc with a thickness of 50~200μm, placed in 10 -2 ~10 -4 Under Pa vacuum condition, heat to 700°C~1000°C, keep warm for 10~120min to obtain metallized layer, heating rate: 5°C / min~40°C / min, cooling rate: 5°...

Embodiment 2

[0024] The difference between this embodiment and embodiment 1 is that the SnCr metallized powder in step (1) is composed of 90% Sn powder and 10% Cr powder by weight percentage. Other steps are identical with specific embodiment 1.

Embodiment 3

[0026] The difference between this example and Example 2 is that the thickness of the SnCr metallized powder coated on the surface of the graphite disc in step (3) is 100 μm. Other steps are identical with specific embodiment 2.

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Abstract

The invention discloses a low-temperature brazing method of a graphite-copper composite structural commutator. The method is characterized by comprising the steps of preparing SnCr metal powder containing an active element Cr by the ball grinding method; coating the prepared SnCr metal powder on the surface of a graphite disc; heating to reach 700 to 1000 DEG C under a vacuum or inert gas protection condition to obtain a metalizing layer being 50 to 200 microns in thickness on the surface of the graphite disc; assembling the metalizing graphite disc and a copper inverting blade; applying 0.5 to 2MPa axial pressure; heating to be 200 to 500 DEG C. According to the method, the brazing temperature is reduced by pre-metalizing, so that the connection strength between the graphite and the copper inverting blade can be improved; the method has the advantages of being simple in process, convenient to carry out, high in graphite-copper combining effect, and long in service life of the prepared inverter.

Description

technical field [0001] The invention relates to the manufacturing and molding technology of a motor commutator, in particular to a low-temperature brazing method for a graphite-copper composite structure commutator. Background technique [0002] We know that the commutator is an important part of the DC motor. It converts the DC current passing through the brush into the alternating current in the winding or converts the alternating electromotive force in the winding into the DC electromotive force on the brush end. How to improve The service life of the commutator is getting more and more attention. Due to the special physical and chemical properties of graphite materials, such as higher high temperature strength, better thermal shock resistance, good electrical and thermal conductivity and good corrosion resistance, graphite materials have been widely used in aerospace, nuclear energy, machinery, Electrical and other fields. Because copper has good thermal conductivity, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01R43/06H01R43/02
CPCH01R43/06H01R43/0207
Inventor 宋晓国柴鉴航付伟雷玉珍于静泊胡胜鹏
Owner HARBIN INST OF TECH AT WEIHAI
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