添加剂对新型AgTiB2触头材料微结构和性能的影响

Effect of Additives on Microstructure and Properties of Novel AgTiB2 Composite

摘要:

采用高能球磨和粉末冶金法制备了含不同添加剂的AgTiB2触头材料，系统研究了WO3、Al、Bi2O3以及WO3+Bi2O3、WO3+Al复合添加对AgTiB2材料微结构和性能的影响。采用扫描电子显微镜(SEM)和能谱仪(EDS)分析了AgTiB2复合粉末形貌和AgTiB2复合材料的组织，并对硬度和导电率进行测试。结果表明：WO3、Al+WO3与Bi2O3+WO3添加有助于提高AgTiB2复合材料致密度；与未添加的相比, 单独添加WO3和复合添加Al+WO3的AgTiB2材料的硬度和导电率都有不同程度的增加，硬度分别为1253和1022 MPa，导电率分别为78.62%IACS和14.91%IACS；与未添加的相比，复合添加Bi2O3+WO3的AgTiB2材料硬度和导电率分别为786 MPa和16.12%IACS

Abstract:

AgTiB2 contact material with different additives was prepared by high-energy milling and powder metallurgy. The effects of WO3, Al, Bi2O3 addition and WO3+Bi2O3, WO3+Al composite additions on the microstructure and properties of AgTiB2 were investigated. The morphology of milled powders and the microstructure of AgTiB2 composite with different additives were characterized by scanning electron microscope equipped with energy disperse spectroscopy, and the hardness and electrical conductivity were tested. The results show that WO3 single addition and WO3+Al, WO3+Bi2O3 composite additions can improve the densification of AgTiB2. In comparison with those of Ag/TiB2 composite without any additive, the hardness and electrical conductivity of the AgTiB2 composite materials with WO3 single addition and WO3+Al composite addition are increased, whose hardness values are 1253 and 1022 MPa respectively, and the electrical conductivity are 78.62%IACS and 14.91%IACS, respectively. The hardness and electrical conductivity of the AgTiB2 composite materials with Bi2O3+WO3 composite addition are 786 MPa and 16.12%IACS, respectively