Abstract
Ag/SnO2 electrical contact material is currently recognized as the most promising environmentally friendly alternative material, but it has the problems of difficult processing and poor wettability between Ag matrix and SnO2 particles. Ag/SnO2Bi2O3CuO composite materials are prepared by reaction synthesis and powder metallurgy technology and the influence of different technology on the microstructure and properties are analyzed and discussed in this paper. The results indicate that the main phases in the Ag/SnO2Bi2O3CuO composite materials prepared by two kinds of technology are Ag, SnO2 and Bi2Sn2O7. The second phase oxide particles in Ag/SnO2Bi2O3CuO composite materials prepared by two kinds of technology mainly have six kinds of distribution position. The physical and mechanical properties of Ag/SnO2Bi2O3CuO composite materials prepared by reaction synthesis technology are better than those by powder metallurgy technology. In addition, the microstructure of Ag/SnO2Bi2O3CuO composite materials prepared by the reaction synthesis technology is more uniform and the distribution of the second phase oxide particles is more dispersive than that by powder metallurgy technology. The difference of microstructure of Ag/SnO2Bi2O3CuO prepared by two kinds of technology mainly occurs in the raw materials and the process of sintering and reaction.
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