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A silver tin/copper oxide compound electrical contact and preparation method

A technology of silver tin oxide and electric contacts, applied in contacts, circuits, electric switches, etc., can solve the problems of limited tin oxide content of products, high silver content of contact materials as a whole, and high production costs, so as to save precious metal silver , Physical properties and electrical properties are improved, and the uniformity of the structure is good.

Active Publication Date: 2008-07-09
SHANGHAI LONGSUN ALLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most of the "internal oxidation method" and "powder metallurgy method" are used to develop and produce silver tin oxide contact materials at home and abroad. The silver tin oxide contacts produced by these two methods are all silver contacts as a whole. The shortcomings of these processes Because: the overall silver content of the contact material is high, the production cost is high, and at the same time, there are certain restrictions on the tin oxide content of the product

Method used

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  • A silver tin/copper oxide compound electrical contact and preparation method

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Embodiment 1

[0023] Embodiment 1: Ag ingot, Sn ingot and mixed rare earth in a ratio of 88:9.5:0.3 by weight, take 26.4Kg of Ag ingot, 2.85Kg of Sn ingot and 0.09Kg of mixed rare earth, place it in an intermediate frequency melting furnace and smelt it into a liquid state After that, the alloy is atomized with high-pressure water atomization equipment, and the atomized particle liquid is dried into alloy powder. 600℃, keep the oxygen pressure of 0.6MPa, take it out after oxidizing for 2 hours, adopt cold isostatic pressing process after testing meets the requirements, put it into a special pressure equipment with a pressure of 150MPa and process it into a billet, and then put it in the equipment with a temperature of 880℃ Sintered for 5h, extruded into a sheet, fixed with copper with Ф6mm copper rivets, under the protection of nitrogen atmosphere, the sintering temperature is 780 ℃, the sintering time is 1h, the composite rolling deformation is 71%, the silver after composite rolling The t...

Embodiment 2

[0025] Ag ingot, Sn ingot and mixed rare earth in a ratio of 92:6.3:0.3 by weight, take 27.6Kg of Ag ingot, 1.89Kg of Sn ingot and 0.09Kg of mixed rare earth, put it in an intermediate frequency melting furnace and smelt into a liquid state, then use high pressure The water atomization equipment is used to atomize the alloy. The atomized particle liquid is dried into alloy powder. After screening, the powder with a particle size of 100-300 mesh is charged into the internal oxidation furnace for oxidation. The temperature during oxidation is controlled at 580 ° C and maintained at 0.5 Oxygen pressure of MPa, take out after 2 hours of oxidation, adopt cold isostatic pressing process after testing and meet the requirements, put it into a special pressure equipment with a pressure of 150MPa and process it into a billet, and then sinter it in the equipment with a temperature of 850 ℃ for 5 hours. After being extruded into a sheet, fixed with copper with Ф5mm copper rivets, under the...

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Abstract

The invention relates to a silver tin oxide / copper compound electrical contact, a working layer of the electrical contact material is composed of silver, tin oxide and mixed rare earth oxide, the weight content of all the components is: 85 percent to 94 percent of Ag, 6 percent to 15 percent of SnO2 and 0.1 percent to 2.0 percent of mixed rare earth oxide, and a welding layer is T2 copper. The weight content of SnO2 is 8 to 12 percent preferentially. The mixed rare earth oxide is a mixture of cerium oxide, lanthanum oxide and yttrium oxide. The preparation method is that the silver and the tin are first mixed according to certain proportion and then are smelted in an intermediate frequency furnace, then high-pressure water atomization equipment is used for carrying out alloy atomization, powder is obtained by drying after the atomization, the powder is screened and arranged in an internal oxidation furnace to carry out the oxidation at certain temperature and oxygen pressure, then billet is obtained by the processing of isostatic cool pressing after the oxidation, after that, a plate is formed by carrying out the sintering and extruding, and finally the finished product is obtained by compound rolling with the copper. The electrical contact is characterized by high conductivity, even and exquisite texture, high bonding strength of the working layer and the welding layer, welding resistance and arc erosion resistance.

Description

technical field [0001] The invention relates to a silver tin oxide / copper composite electrical contact and a preparation method thereof, belonging to the technical field of metal matrix composite materials. technical background [0002] Electrical contacts are the key components of electrical switches such as relays and contactors, and their performance directly affects the reliability and service life of electrical switches. For a long time, the electrical industry at home and abroad has used silver cadmium oxide contact materials in large quantities, but silver cadmium oxide materials have certain toxicity. With the improvement of people's living standards, people's requirements for the comprehensive performance of electrical appliances are getting higher and higher. Silver tin oxide materials are currently environmentally friendly contact materials that can replace silver cadmium oxide materials in a large range. [0003] At present, the "internal oxidation method" and "...

Claims

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Application Information

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IPC IPC(8): H01H1/023H01H11/04C22C1/04
Inventor 谢平云郑元龙黄文锋
Owner SHANGHAI LONGSUN ALLOY CO LTD
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