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Silver tungsten carbide contact material and preparation method thereof

A contact material, silver tungsten carbide technology, applied in metal processing equipment, transportation and packaging, coating, etc., can solve the problems of poor powder formability and limited electrical breaking performance, so as to improve the forming performance and powder forming sexual effect

Active Publication Date: 2019-07-30
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.
[0007] The conventional coating process cannot avoid the agglomeration of tungsten carbide particles during the chemical reaction process, and the silver produced by the reaction will not wrap a single tungsten carbide particle, but will wrap several agglomerates of tungsten carbide particles, so there is A large number of tungsten carbide particles are in direct contact with the particles, and the powder formability is poor

Method used

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  • Silver tungsten carbide contact material and preparation method thereof
  • Silver tungsten carbide contact material and preparation method thereof
  • Silver tungsten carbide contact material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method of silver tungsten carbide contact material, comprising the steps of:

[0032] a. Dissolve 3.25kg of silver nitrate solid into 2500L of deionized water to configure silver nitrate solution;

[0033] b. Add 33.2kg of tungsten carbide powder and silver nitrate solution into the reaction container, then add 3kg of polyethylene glycol and appropriate amount of deionized water into the container, ultrasonicate and stir for 2 hours;

[0034] c. Keep ultrasonic and stirring, gradually add sodium hydroxide solution to the container until the pH value of the solution reaches 8-9, keep ultrasonic and stir for 0.5 hours;

[0035] d. Maintain ultrasonication and stirring, gradually add glucose solution with a concentration of 100g / L to the container at a speed of 1.5L / min, until the silver in the solution is completely precipitated, and maintain ultrasonication and stirring for 0.5 hours;

[0036] e. Suction filter the solution, wash the obtained composite pow...

Embodiment 2

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

[0044] a. Dissolve 6.5kg of silver nitrate solid into 4000L of deionized water to configure silver nitrate solution;

[0045] b. Add 66.79kg of tungsten carbide powder and silver nitrate solution into the reaction container, then add 5kg of polyethylene glycol and appropriate amount of deionized water into the container, ultrasonicate and stir for 2 hours;

[0046] c. Keep ultrasonic and stirring, gradually add sodium hydroxide solution to the container until the pH value of the solution reaches 8-9, keep ultrasonic and stir for 0.5 hours;

[0047] d. Keep ultrasonication and stirring, and gradually add glucose solution with a concentration of 100g / L to the container at a speed of 3L / min. After all the silver in the solution is precipitated, keep ultrasonication and stirring for 0.5 hours;

[0048] e. Suction filter the solution, wash the obtained composite powder twice with deio...

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Abstract

The invention discloses a preparation method of a silver tungsten carbide contact material. The preparation method comprises the following steps that S1, a silver nitrate solution, polyethylene glycol, a sodium hydroxide solution and a glucose solution are uniformly mixed, a reduction reaction is carried out under the condition of ultrasonic oscillation and stirring, silver is precipitated and wrapped outside tungsten carbide powder to form silver-wrapped tungsten carbide composite powder; S2, the silver-wrapped tungsten carbide powder and silver powder are mixed and then pressed into a pressed blank; and S3, the pressed blank prepared in S2 and a silver block are placed in a sintering furnace protected by an ammonia decomposition atmosphere for sintering and performing infiltrating to obtain the silver tungsten carbide contact material. The invention further discloses the silver tungsten carbide contact material prepared by the preparation method. The silver tungsten carbide contact material prepared by the preparation method is a high-compactness infiltration type silver tungsten carbide material, and the mass ratio of the tungsten carbide is 40%-90%.

Description

technical field [0001] The invention belongs to the technical field of contact materials, in particular to a silver tungsten carbide contact material and a preparation method thereof. Background technique [0002] As the power distribution end of the power grid has higher and higher requirements on the reliability of electrical appliances, electrical appliance manufacturers are constantly introducing low-voltage power distribution products with higher breaking indicators. Some electronic molded case circuit breakers have been able to reach the limit breaking index of 150kA. The improvement of the breaking index of electrical appliances means that the thermal penetration of the arc is extremely strong when breaking. At this time, the contact material is easily eroded by the arc, causing the electrical appliances to fail to connect and malfunction. [0003] Considering the properties of materials such as electrical conductivity and corrosion resistance, the most commonly used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/02B22F3/02B22F3/10C22C5/06C22C29/08C22C32/00B22F1/18
CPCB22F9/24B22F3/02B22F3/1007C22C5/06C22C29/08C22C29/067C22C32/0052B22F2009/245B22F1/18B22F2998/10C22C1/1084B22F2999/00B22F2201/016
Inventor 宋振阳林旭彤周克武孔欣费家祥宋林云黄庆忠郭义万夏宗斌张明江
Owner ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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