Ag／SnO2-La2O3-Bi2O3触头材料的研究

采用粉末冶金方法制备了新型银-稀土氧化物触头材料Ag／SnO2-La2O3-Bi2O3。利用扫描电镜（SEM）及能谱分析（EDS），对Ag／SnO2-La2O3-Bi2O3触头材料的显微组织进行了分析，并对其进行了通断能力、温升及侵蚀量的实验。新型材料Ag／SnO2-La2O3-Bi2O3通过了通断能力实验，与Ag／CdO相比平均温升相近，但侵蚀量仅约为Ag／CdO的2／3。由实验结果可知，此材料具有较好的物理、机械、电气性能及较低的成本，具有很好的应用前景和经济效益，有望成为一种可替代Ag／CdO的无毒新型触头材料。

Study on the Ag/SnO2-La2O3-Bi2O3 Contact Material

A new silver-rare earth oxide contact material, Ag/SnO2-La2O3-Bi2O3, has been produced using powder metallurgy method. The microstructure of Ag/SnO2-La2O3-Bi2O3 was analyzed using SEM and EDS. The new contact material was tested through temperature rise, make-break capacity testing and arc erosion. The new contact material passes the make-break capacity testing, its temperature rise is similar to that of Ag/CdO and the average arc erosion of make contact is only 2/3 that of Ag/CdO. At last, the cost of Ag/SnO2-La2O3-Bi2O3 and Ag/CdO is analyzed. From the testing results and the cost analysis, the new material has preferable physics, mechanism and electric behavior and lower cost. The new innocuity contact material may be substituted for Ag/CdO because of its preferable application foreground and economy benefit.