AgSnO2-Y2O3 compound powders were prepared by a mechanical alloying (MA) method, AgSnO2-Y2O3 contact material was fabricated by pressing, sintering, repressing and resintering, the effect of Y2O3 addition, repressing and resintering on the microstructure and density of AgSnO2 contact material was investigated. The results show that there are drastic dedensifications or swelling, cracks and pores in AgSnO2 contact material fabricated by powder metallurgy, which thus has a lower density. The addition of Y2O3 is helpful in improving the microstructure and density significantly. The density increases significantly after repressing and resintering, and can reach 8.42 g/cm3.

Keywords: Mechanical alloying (MA), AgSnO2 contact material, Repressing, Resintering, Density.