Silver tin oxide electric contact material and preparation method thereof

Abstract

The invention discloses a silver tin oxide electric contact material and a manufacturing method thereof, and the technical scheme is as follows: the method comprises the following steps: preparing silver tin oxide powder by using a chemical coating method, and then carrying out the procedures of microwave heating static pressure sintering molding, hot extrusion, drawing and the like to finally prepare a finished wire and forming a rivet-shaped contact. The method has the advantages that the silver tin oxide powder which is more uniform than that of a traditional water atomization method is obtained by using a chemical coating method, and then through microwave heating and isostatic pressing sintering, the compactness of the material is improved, the sintering process of the material is accelerated, and the processing time is shortened. And meanwhile, a more uniform fine grain microstructure can be obtained, and the prepared material has better ductility and toughness, that is, the processability of the material is better than that of a traditional atomization-common sintering process. And meanwhile, the preparation period of the material is shortened through hot isostatic pressing sintering, so that the cost is reduced.

Description

technical field [0001] The invention belongs to the field of electrical material manufacturing, in particular to a silver tin oxide electrical contact material and a preparation method thereof. Background technique [0002] Silver-based electrical contact materials have excellent electrical and thermal conductivity. Due to the low hardness of pure silver and poor electrical wear resistance, it is usually necessary to add other additives to the silver matrix to enhance the electrical properties of the material, such as contacts Excellent welding resistance, electrical life and arc burning resistance. Silver tin oxide (AgSnO 2 ) is one of them, which has good anti-welding and anti-burning properties, and can be applied to high-current relays and contactor switches. Currently preparing AgSnO 2 The main methods are alloy internal oxidation method and atomization method. There are uneven distribution of oxide particles in the electrical contact materials produced by the above ...

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Problems solved by technology

[0006] The traditional chemical deposition method is to use a reducing agent to reduce silver ions to simple silver, and deposit them on the surface of the oxide, and finally form an electrical contact material through isostatic pressing, hot extrusion, and drawing processes. The atomization process is to The alloy melt is atomized into powder by air or cooling water, and then the alloy oxide powder is made through the powder oxidation process, and finally the powder is pressed and formed into an electrical contact material; while the alloy internal oxidation method is prepared by alloy melting and alloy oxidation However, due to the uneven heating in the forming process and sintering process in the traditional process of preparing alloy materials, and the heating time is long, the processability and electrical life of the material are deteriorated, and the production time is long. High cost due to time, therefore need to improve the existing electrical contact material manufacturing process

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