Preparation method of silver tin oxide electrical contact material

The invention provides a preparation method of a silver tin oxide electrical contact material, and the technical scheme is that the preparation method comprises the working procedures of atomization, powder oxidation, powder mixing, ingot pressing, sintering, ingot oxidation and the like, during powder mixing, powder of a low-melting-point metal additive and AgSnO2 powder are uniformly mixed to obtain mixed powder, then the mixed powder is pressed into a billet through cold isostatic pressing, sintering is conducted, and the silver tin oxide electrical contact material is obtained. The sintering temperature is higher than the melting point of the low-melting-point metal additive, the low-melting-point metal additive powder is melted into a liquid state to form a liquid-phase sintering layer, and the wettability of liquid Ag to SnO2 particles in the contact working process can be improved through the formation of the liquid-phase sintering layer, so that the arc erosion resistance and fusion welding resistance