摘要
Ag/Bi_(2)Sn_(2)O_(7)电接触材料虽然电阻率比Ag/SnO 2材料低,但其塑性差、成型困难,因此对其力学性能的优化是实现其工业应用的重要环节。采用水热法制备Ni元素掺杂的改性Bi 2Sn 2O 7粉体,结合高能球磨和粉末冶金工艺制备了不同Ni掺杂量的Ag/Bi_(2)Sn_(2)O_(7)电接触材料,运用X射线衍射仪、扫描电镜、硬度仪、密度计和万能试验机对所制备的材料进行分析测试。测试结果表明:随着Ni掺杂量的增加,改性Ag/Bi_(2)Sn_(2)O_(7)电接触材料的密度和硬度呈先增大后减小趋势,并且当前驱体中Ni^(2+)与Sn^(4+)的摩尔比为2∶20时,Ni掺杂Ag/Bi_(2)Sn_(2)O_(7)电接触材料的物理性能最佳,相应的密度及硬度均最高,分别为9.94 g/cm^(3),94.2 HV;对应的成品丝材的断后延伸率为3.8%,是Ag/SnO 2电接触材料的7.6倍,抗拉强度为200.2 MPa,与Ag/Bi_(2)Sn_(2)O_(7)电接触材料相比,提升了79.5%。
Ag/Bi_(2)Sn_(2)O_(7) electrical contact material shows a lower resistivity than Ag/SnO 2 material,but their plasticity is poor and molding is difficult.Therefore,it is important to optimize their mechanical properties to improve the industrial applications.In this study,Ni element-doped modified Bi 2Sn 2O 7 powder was prepared by hydrothermal method,and Ag/Bi_(2)Sn_(2)O_(7) electrical contact materials with different Ni dosages were prepared by a combination of high-energy ball milling and powder metallurgy.The prepared Ag/Bi_(2)Sn_(2)O_(7) material was characterized by X-ray diffractometer,scanning electron microscope,hardness meter,density meter and universal tensile testing machine.The results show that,with the increase of Ni doping,the density and hardness of the modified Ag/Bi_(2)Sn_(2)O_(7) electrical contact material tended to increase first and then decrease.When the molar ratio of Ni^(2+)to Sn^(4+)in the precursor is 2∶20,the physical properties of Ni-doped Ag/Bi_(2)Sn_(2)O_(7) materials are the best,and the corresponding density and hardness are 9.94 g/cm^(3) and 94.2 HV,respectively.The elongation of the final wire is 3.8%,which is 7.6 times that of Ag/SnO 2 material;the tensile strength is 200.2 MPa,which was enhanced by 79.5%over Ag/Bi_(2)Sn_(2)O_(7) material.
作者
郑晓华
张红生
沈涛
杨芳儿
陈琍
ZHENG Xiaohua;ZHANG Hongsheng;SHEN Tao;YANG Fanger;CHEN Li(College of Materials Science and Engineering,Zhejiang University of Technology,Hangzhou 310014,China;Zhejiang CaliforniaInternational Nanotechnology Research Institute,Zhejiang University,Hangzhou 310058,China;College ofMechanical Engineering,Zhejiang University of Technology,Hangzhou 310023,China)
出处
《浙江工业大学学报》
CAS
北大核心
2023年第2期193-198,共6页
Journal of Zhejiang University of Technology
基金
浙江省重点研发计划项目(2019C01088)
浙江省自然科学基金资助项目(LQ20E020008)。
