Preparation method of silver-tin oxide-wolfram carbide composite electric contact material and product thereof

A technology of silver tin oxide tungsten carbide and electric contact materials, which is applied in the direction of contacts, circuits, electric switches, etc., can solve the problem of no silver tin oxide tungsten carbide mixed powder, no chemical reduction coating method, and uniformity of mixed powder There are still some problems to be improved to achieve the effect of reducing the silver content of the contact, improving the ability to resist arc burning, and improving the resistance to arc erosion

Inactive Publication Date: 2017-12-22
FUDA ALLOY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent CN103589898A discloses a preparation method of a silver metal oxide tungsten carbide composite electrical contact material and its products, but the mixed powder preparation process of this method is a pre-oxidation method and a common powder mixing method, and the chemical reduction coating method is not used, so it cannot To overcome the limitation of physical milling, the uniformity of mixed powder needs to be improved;
[0005] Patent CN101976615A discloses silver tungsten carbide graphite contact material and its preparation method, and patent CN103824710A discloses a method and product thereof for preparing silver tungsten carbide contact material from silver-coated tungsten carbide powder. The contact materials are different. The second is that although the mixed powder is prepared by the chemical reduction coating method, the ultrasonic technology is not used.
[0006] Therefore, through consulting the patents, it is found that there is no method for preparing silver tin oxide tungsten carbide mixed powder by chemical reduction coating method, and there is no method for preparing silver tin oxide tungsten carbide mixed powder by chemical reduction coating method to prepare silver tin oxide tungsten carbide Method for Composite Electrical Contact Material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Roll 22.25kg of pure silver plates to a thickness of 1mm and place them in an acid-dissolving bucket, add 10L of pure water to the acid-dissolving bucket, and then add 25L of 65% analytically pure concentrated nitric acid. After the pure silver plate in the acid-dissolving bucket is completely dissolved, let it stand until the silver nitrate solution is cooled; after the silver nitrate solution is cooled to normal temperature, add ammonia water with a mass fraction of 25% to the silver nitrate solution while stirring to make the silver-ammonia mixed solution PH The value is 11.

[0031] 2. (1) Add pure water into the reaction vessel, start the stirrer, start the ultrasonic equipment, the frequency is 40kHz, and the power is 150W; (2) Weigh the SnO 2 Powder 2kg, additive powder 0.25kg (including 0.1kg Bi 2 o 3 and 0.15kg In 2 o 3 ) and WC powder 0.5kg were added to the reaction vessel in turn; (3) Hydrazine hydrate solution 15L was prepared with a volume ratio of ...

Embodiment 2

[0038] 1. Roll 21.15kg pure silver plates to a thickness of 1mm and place them in an acid-dissolving bucket, add 10L of pure water to the acid-dissolving bucket, and then add 25L of 65% analytically pure concentrated nitric acid. After the pure silver plate in the acid-dissolving bucket is completely dissolved, let it stand until the silver nitrate solution is cooled; after the silver nitrate solution is cooled to normal temperature, add ammonia water with a mass fraction of 25% to the silver nitrate solution while stirring to make the silver-ammonia mixed solution PH The value is 13.

[0039] 2. (1) Add pure water to the reaction vessel, start the stirrer, start the ultrasonic equipment, the frequency is 30kHz, and the power is 100W; (2) Weigh the SnO 2 Powder 2.5kg, additive powder 0.5kg (including 0.2kg Bi 2 o 3 , 0.2kg MoO 3 and 0.1kg WO 3 ) and WC powder 0.85kg were added to the reaction vessel in turn; (3) Hydrazine hydrate solution 15L was prepared with a volume rat...

Embodiment 3

[0046] 1. Roll 18.5kg of pure silver plates to a thickness of 1mm and place them in an acid-dissolving bucket, add 7.5L of pure water to the acid-dissolving bucket, and then add 20L of 65% analytically pure concentrated nitric acid. After the pure silver plate in the acid-dissolving bucket is completely dissolved, let it stand until the silver nitrate solution is cooled; after the silver nitrate solution is cooled to normal temperature, add ammonia water with a mass fraction of 25% to the silver nitrate solution while stirring to make the silver-ammonia mixed solution PH The value is 12.

[0047] 2. (1) Add pure water into the reaction vessel, start the stirrer, start the ultrasonic equipment, the frequency is 40kHz, and the power is 150W; (2) Weigh the SnO 2 Powder 3.5kg, additive powder 1.2kg (including 0.5kg In 2 o 3 , 0.3kg MoO 3 , 0.3kg TeO 2 and 0.1kg Sb 2 o 3 ) and WC powder 1.8kg into the reaction vessel in turn; (3) Prepare 12.5L of hydrazine hydrate solution wi...

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Abstract

The invention discloses a preparation method of silver-tin oxide-wolfram carbide composite electric contact material and a product thereof. The technical scheme is characterized in that a basis material of a contact comprises, by weight, 1-20% of tin oxide, 0.01-10% of wolfram carbide, less than 5% of additives and the balance silver. The preparation method of the silver-tin oxide-wolfram carbide composite electric contact material and the product thereof has the advantages and the positive effects as follows: 1, a chemical reduction coating method is adopted, so that the uniformity of mixed powder is better and the sintering strength is higher; 2, the surfaces of the WC powder body and the SnO2 powder body are uniformly coated with a silver layer, so that the electric arc erosion resistance and the melt welding resistance of the electric contact material are improved, and the reliability of a contactor is improved; and 3, the Ag-SnO2-WC contact material with appropriate components is selected, so that the arc burning resistance and the fusion welding resistant performance of the contact are improved, and meanwhile, the silver content of the contact is reduced, so that the silver-saving effect is achieved.

Description

technical field [0001] The invention belongs to the field of electric contact materials, and specifically refers to a preparation method of a silver tin oxide tungsten carbide composite electric contact material (AgSnO2WC) and a product thereof. Background technique [0002] At present, silver-based materials are mostly used as electrical contact materials in the low-voltage electrical industry, and silver-tin oxide (AgSnO2) materials have comprehensive electrical properties due to their excellent arc erosion resistance, welding resistance and low and stable contact resistance. , occupies an important position in the entire electrical contact material system. During the contact process of electrical contacts, welding between contacts is one of the main failure modes. The usual way to improve the anti-welding performance of materials is to increase the content of high-melting point oxide components in the material. This solution will reduce the electrical conductivity of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C5/06C22C32/00H01H1/021H01H11/04
CPCH01H1/021H01H11/048C22C1/05C22C5/06C22C32/0005B22F2998/10B22F1/17B22F3/02B22F3/1007B22F9/24
Inventor 周克武万岱姚培建缪仁梁柏小平林万焕
Owner FUDA ALLOY MATERIALS
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