Study On The AgSnO₂ Contact Material With The Addition Of Rare Earth Oxide

AgCdO has been replaced by AgSnO₂ because of its no damage to the environment and the same performance as AgCdO. But it has been also found that contact resistance and temperature rise of AgSnO₂ are higher than those of AgCdO in the AC3 operation condition. It is necessary for us to develop a kind of AgSnO₂ contact materials with addition of rare earth oxide.First, the development of AgSnO₂ in home and abroad is summarized in this paper. The significant and the content of the study are presented on the basis of studying the advantage and the weakness of AgSnO₂.Then on the basis of studying the sample preparation, the method of how to make specimen is presented. We also present the process of the sample preparation. Second, we analysis the basic behavior parameters of AgSnO₂-La₂O₃ and indicate the best ratio of constituents of AgSnO₂-La₂O₃-Bi₂O₃. Then we make an analysis about the physical and mechanical properties, microstructure and electrical properties of the specimen. Last, compare the result of AgSnO₂-La₂O₃-Bi₂O₃ to AgSnO₂ (12) and AgCdO(12).We found that the main physical and mechanical properties of the three are similar. In addition, the electrical behavior of AgSnO₂-La₂O₃-Bi₂O₃ is good. The result indicate that the new AgSnO₂-La₂O₃-Bi₂O₃ contact material has better application outlook, and it will be the substitution of AgSnO₂(12) and AgCdO(12).