Preparation method of silver-saving laminating composite contact terminal piece

Abstract

The invention relates to a silver-saving laminating composite contact terminal piece and a preparation method thereof. The silver-saving laminating composite contact terminal piece comprises four layers of structure materials of a silver oxide layer, a transition silver layer, a conducting pure copper layer and a welding layer, wherein the silver oxide layer is an AgSnO or AgCdO material preparedby a powder metallurgic method, the second-phase oxide of the silver oxide layer is uniformly distributed in the whole metallurgical structure, and the vicinity in the middle of the silver oxide layerhas no poor oxide bands. Because the silver oxide layer can be fully used in the turn-on and turn-off process of the piece, the silver-saving effect of the material reaches 20 percent-40 percent, andthe electrical performance and the mechanical performance of the material are equal to and even better than those of a material with an original design structure. The silver-saving laminating composite contact terminal piece is manufactured according to the following steps: firstly, a silver-based composite material plate or band is extruded by powder metallurgy, isostatic pressing and sintering;secondly, the laminating composite material is prepared by a controlled atmosphere thermal compounding method; and finally, the piece is prepared by a thickness rolling and punch forming procedure ofa finished product.

Description

technical field [0001] The invention relates to a method for preparing a silver-saving layered composite contact piece, which is mainly applied to the electric contact material and its manufacture in the low-voltage electric appliance industry. Background technique [0002] At present, most of the low-current electrical products in the low-voltage electrical industry use silver-based materials as their electrical contact materials. This kind of electrical contact material chooses silver with good electrical and thermal conductivity and certain resistance to electric corrosion as the main substrate, but the hardness of pure silver is too low and the wear resistance is poor, so MeO (metal oxide The second phase can be prepared to meet the requirements of electrical contact applications with good welding resistance, arc burn resistance and wear resistance. Among them, most of the traditional silver-based materials are silver cadmium oxide. With the increasingly stringent envir...

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Problems solved by technology

These patents are all alloy materials with copper as the matrix. The added elements mainly include cadmium, cerium oxide, lanthanum trioxide, diamond powder, and silver. Therefore, the main defects of copper's poor electrical corrosion resistance and poor oxidation resistance make these copper-based contact materials still unable to replace the silver-based contact materials used in low-voltage electrical appliances to a considerable extent (practical applications prove that the relatively low-voltage contact materials above 15A Copper-based electrical contact materials cannot be used under high current conditions)

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