NiO添加剂对高致密Ag-SnO_(2)材料力学和电接触性能的影响  

Effect of addition of NiO on the mechanical and electrical contact properties of high-density Ag-SnO_(2) materials

作　　者：范玉卓 梁滢雪 陈良玉 彭一洋 李桂景 FAN Yuzhuo;LIANG Yingxue;CHEN Liangyu;PENG Yiyang;LI Guijing(Department of Engineering Mechanics,Shijiazhuang Tiedao University,Provincial Collaborative Innovation Center of Mechanics of Intelligent Materials in Hebei,Hebei Research Center of the Basic Discipline Engineering Mechanics,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学工程力学系,河北省智能材料力学协同创新中心,河北省工程力学基础学科研究中心,石家庄050043

出　　处：《贵金属》2024年第3期59-66,共8页Precious Metals

基　　金：国家自然科学基金(12272244);河北省大中学生科技创新能力培育专项(22E50106D)。

摘　　要：为提高Ag-SnO_(2)电接触材料的综合性能,采用真空热复压技术实现了高效致密化,研究了纳米和亚微米NiO添加剂对力学和耐电弧侵蚀性能的影响及机理。借助电子背散射衍射仪(EBSD)和扫描电子显微镜(SEM)等表征材料的微观结构及电弧侵蚀形貌。结果表明:含纳米NiO添加剂的Ag-SnO_(2)材料的相对密度显著增加,高达99.78%,电导率超过72%IACS。纳米NiO添加剂能够增加材料的抗压强度,而亚微米NiO导致材料的极限应变出现下降趋势。NiO添加剂可显著改善Ag-SnO_(2)材料的耐电弧侵蚀性能,抑制电极表面高温蒸发和孔洞产生。由于燃弧能量明显下降和熔池粘度增加,材料的质量损失明显减少。与无NiO的材料相比,含有亚微米NiO材料的晶粒得到细化,质量损失最低,阳极和阴极分别下降36.5%和43.8%。In order to improve the comprehensive properties of Ag-SnO_(2) electrical contact materials,highly efficient densification of the materials was successfully realized by a simple and feasible vacuum hot repressing.The effects of the addition of nano and sub-micron NiO on mechanical and arc erosion resistance properties were further investigated,and the correlative mechanism was explored.The microstructure and arc erosion morphology of the materials prepared in this way were characterized by using electron backscatter diffraction(EBSD)and scanning electron microscopy(SEM).The results showed that the relative density of Ag-SnO_(2) materials with nano NiO significantly increased,reaching up to 99.78%,and the conductivity exceeded 72%IACS.Nano NiO increased the compressive strength of the Ag-SnO_(2) materials,while the submicron NiO led to a downward trend of the ultimate strain.The arc erosion resistance of the Ag-SnO_(2) materials can be significantly enhanced by NiO.The high-temperature evaporation and pore formation on the electrode surface were inhibited.Due to a decrease in arc energy and viscosity of melt pool,the mass loss of the materials was significantly reduced.Compared with pure Ag-SnO_(2),Ag-SnO_(2) doped with sub-micron NiO had the finer grains and the lowest mass loss,with a decrease of 36.5%for the anode and 43.8%for the cathode,respectively.

关 键 词：Ag-SnO_(2)材料 NiO添加剂 致密化 力学性能 电接触性能 

分 类 号：TM501.3[电气工程—电器]