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High-dispersivity silver tungsten carbide electrical contact material and preparation method thereof

A technology of electrical contact materials, silver tungsten carbide, applied in contacts, circuits, electric switches, etc., can solve problems such as limiting the breaking performance of electrical appliances

Active Publication Date: 2022-03-15
ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This problem also limits the further improvement of electrical breaking performance to a considerable extent.

Method used

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  • High-dispersivity silver tungsten carbide electrical contact material and preparation method thereof
  • High-dispersivity silver tungsten carbide electrical contact material and preparation method thereof
  • High-dispersivity silver tungsten carbide electrical contact material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation method of silver tungsten carbide contact material, comprising the steps of:

[0031] a. The proportion of tungsten carbide and additives is 98:2, and the composition of additives is Fe powder: 0.7-1.0%, Co powder: 0.3-0.5%, nickel powder: 0.3-0.5%;

[0032] b. Put tungsten carbide and additives into the ball mill, the ball milling time is 10H, the speed is 20 rpm, and the ratio of ball to material is 2:1;

[0033] c. Add 3.5kg of tungsten carbide additive pretreatment powder and silver nitrate solution into the reaction container, then add 0.015kg of polyacrylic acid and an appropriate amount of deionized water into the container, ultrasonicate and stir for 2 hours;

[0034] d. Maintain ultrasonication and stirring, gradually add hydrazine hydrate solution to the container until the pH value of the solution reaches 8-9, and maintain ultrasonication and stirring for 0.5 hours;

[0035] e. Keep ultrasonication and stirring, and gradually add glucose soluti...

Embodiment 2

[0043] A preparation method of silver tungsten carbide contact material, comprising the steps of:

[0044] a. The proportion of tungsten carbide and additives is 98:3, and the composition of additives is Fe powder: 1-1.3%, Co powder: 1-1.3%, nickel powder: 0.6-1.0%, copper powder: 0.05-0.2% ;

[0045] b. Put tungsten carbide and additives into the ball mill, the ball milling time is 15H, the speed is 40 rpm, and the ratio of ball to material is 5:1;

[0046]c. Add 3.5kg of tungsten carbide additive pretreatment powder and silver nitrate solution into the reaction container, then add 0.015kg of polyacrylic acid and appropriate amount of deionized water into the container, ultrasonicate and stir for 2 hours;

[0047] d. Maintain ultrasonication and stirring, gradually add hydrazine hydrate solution to the container until the pH value of the solution reaches 8-9, and maintain ultrasonication and stirring for 0.5 hours;

[0048] e. Keep ultrasonication and stirring, and graduall...

Embodiment 3

[0057] A preparation method of silver tungsten carbide contact material, comprising the steps of:

[0058] a. The ratio of tungsten carbide and additives is 98:1, and the additives are composed of Co powder: 0.1-0.3%, nickel powder: 0.4-0.7%, copper powder: 0.05-0.2%;

[0059] b. Put tungsten carbide and additives into the ball mill, the ball milling time is 24H, the speed is 60 rpm, and the ball-to-material ratio is 10:1;

[0060] c. Add 3.5kg of tungsten carbide additive pretreatment powder and silver nitrate solution into the reaction container, then add 0.015kg of polyacrylic acid and appropriate amount of deionized water into the container, ultrasonicate and stir for 2 hours;

[0061] d. Maintain ultrasonication and stirring, gradually add hydrazine hydrate solution to the container until the pH value of the solution reaches 8-9, and maintain ultrasonication and stirring for 0.5 hours;

[0062] e. Keep ultrasonication and stirring, and gradually add glucose solution with...

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Abstract

The invention discloses a preparation process of a high-dispersity silver tungsten carbide contact material, which comprises the following steps: pretreating and uniformly mixing tungsten carbide powder and additive powder in ball milling equipment, then preparing coated powder of silver-coated composite powder, then performing high-energy crushing, and doping a forming agent to prepare particles, thereby obtaining the high-dispersity silver tungsten carbide contact material. And the pressed blank is placed in a debinding furnace protected by ammonia decomposition atmosphere to remove the pressed blank forming agent, the degreased pressed blank and the silver sheet are placed in an infiltration furnace protected by ammonia decomposition atmosphere to be infiltrated, and the silver tungsten carbide contact material is obtained. According to the silver tungsten carbide contact material prepared through the technology, the dispersity and dispersivity of the additives in the silver tungsten carbide matrix are higher, the infiltration performance is improved, and infiltration holes are reduced; after the coated powder is subjected to high-energy crushing treatment, air holes wrapped in the coated powder are removed, the powder is refined, the product is not layered, the fracture surface is free of holes, aggregation and reinforcement phase particle exposure, and silver and tungsten carbide are well combined.

Description

technical field [0001] The invention belongs to the field of electrical contact materials, and specifically refers to a highly dispersible silver tungsten carbide electrical contact material and a preparation method thereof. Background technique [0002] Silver tungsten carbide contact materials have been widely used in the field of circuit breakers. On the one hand, the material contains micron-sized tungsten carbide particles as a reinforcing phase, which can greatly improve the arc ablation resistance of contact materials; on the other hand, this The material is made by powder metallurgy and liquid phase sintering (infiltration) process, which can ensure good wetting of tungsten carbide particles and silver matrix, thereby reducing material splashing under high-temperature arc action, and has good resistance to arc erosion. [0003] In order to continue to improve the arc erosion resistance of silver tungsten carbide materials, the usual practice is to use finer tungsten ...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C29/08H01H1/0233
CPCC22C1/051C22C29/08C22C29/067H01H1/0233
Inventor 孔欣宋振阳费家祥林旭彤郭仁杰万岱宋林云
Owner ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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