Preparation method of fibriform metal copper oxide enhanced silver-based electric contact material

Abstract

The invention relates to a preparation method of a fibriform metal copper oxide enhanced silver-based electric contact material, which is used for preparing the silver copper oxide electric contact material (wires) by taking silver powder and silver and copper alloy powder as raw materials, adding a small number of tungsten and molybdenum elements as performance adjusting elements, taking the silver oxides as a reactant and adopting the steps of mixing, press forming, solid phase in-situ sintering, extruding and drawing. The invention is characterized in that: (1) the formation of the copper oxide and the fibrosis of the copper oxide are finished at a time in the preparation and machining processes; (2) the fibriform distribution of the copper oxide forms a microstructural characteristic with a certain orientation relation to make the metal oxide rooted in a silver matrix, thereby solving the problem of the metal oxide loss of the traditional particle metal oxide in electrical arc corrosion, improving the electrical arc corrosion resistance of the metal oxide and also broadening the application range of the silver metal oxide electric contact material; and (3) the preparation method has the advantages of short flow, low production cost and easy industrialization.

Description

Technical field [0001] The invention relates to the technical field of precious metal-based composite materials, in particular to a preparation method of a fibrous metal copper oxide reinforced silver-based electrical contact material. Background technique [0002] The known silver metal oxide electrical contact materials are all granular metal oxide reinforced silver-based composite materials, such as AgSnO2, AgCdO, AgZnO, AgREO, and the like. Although AgCdO electrical contact materials have excellent comprehensive properties and are called "universal contact materials", their use is restricted by the EU's ROS directive due to toxicity issues during preparation and use. Several other silver metal oxide materials have been developed in recent years and are considered to be the best electrical contact materials to replace AgCdO composite materials. Although these silver metal oxide composite materials can basically meet the needs of the market, they are compatible with AgCdO elect...

AI Technical Summary

Problems solved by technology

Among them, although the AgCdO electrical contact material has excellent comprehensive performance and is called "universal contact material", it is restricted by the EU ROS directive due to toxicity problems during preparation and use.

Several other silver metal oxide materials have been developed in recent years and are considered to be the best electrical contact materials to replace AgCdO composite materials; although these silver metal oxide composite materials can basically meet the needs of the market, they are not compatible with AgCdO Compared with it, its comprehensive performance is not very ideal, especially in the aspects of arc resistance and arc extinguishing, which need further improvement

[0003] In addition, as far as the traditional silver metal oxide electrical contact materials are concerned, the arc erosion is mainly caused by the metal oxide particles forming a molten pool under the action of the arc, and the splashing or adhesion of the metal oxide occurs during the contact process of the contacts, resulting in The reduction of the total amount of metal oxide in the silver metal oxide electrical contact material causes the failure of the silver metal oxide electrical contact material, which is characterized by poor arc corrosion resistance in use