【作者】 李凤华； 王珏； 陈姗姗； 霍自美； 樊占国；

【Author】 Li Fenghua, Wang Jue, Chen Shanshan, Huo Zimei, Fan Zhanguo (School of Materials and Metallurgy, Northeastern University, Shenyang 110006, China)

【机构】 东北大学材料与冶金学院；

【摘要】 为了提高常用超导基底材料Ag的熔化温度,选择了高熔点的金属Ni及Al2O3作为添加剂,采用镀层扩散与粉末冶金的方法制备了Ag-Ni合金及Al2O3弥散Ag基复合材料。结果证明,Ni和Ag相互扩散困难,不易生成固溶合金;而含量为5％的Al2O3粒子掺杂在 Ag基体中,可以提高Ag的熔化温度至1000℃以上,且复合材料的平均线膨胀系数接近于YBaCuO的平均线膨胀系数。更多还原

【Abstract】 In order to increase the melting temperature of Ag substrate commonly used in superconductor materials, high melting point metal nickel and alumina were selected as additives to improve the properties of Ag with high temperature diffusion and powder metallurgy methods. The results indicate that nickel hardly diffuse into Ag matrix to form silver alloy. Al2O3 with a mass fraction of 5% doped in Ag matrix increase the melting point of Ag up to 1000℃ and the average coefficient thermal expansion of 5 % Al2O3/Ag sample is near to that of YBaCuO.更多还原