稀土钼SPS烧结体阴极的次级发射性能和微观结构研究  

Study on the secondary emission properties and microstructure of rare earth molybdenum cathode sintered by spark plasma sintering (SPS)

作　　者：李洪义[1] 王金淑[1] 周美玲[1] 杨飒[1] 陶斯武[1] 崔颖[1] 

机构地区：[1]北京工业大学材料科学与工程学院新型功能材料教育部重点实验室,北京100022

出　　处：《功能材料》2003年第5期535-537,共3页Journal of Functional Materials

基　　金：国家重点基础研究发展规划(973项目)资助项目(G1998061316);霍英东青年教师基金资助项目(81040);北京市科技新星资助课题(954819700);北京市自然科学基金资助课题(2992006)

摘　　要：　利用湿法冶金的方法制备了稀土 钼粉末,然后用SPS快速烧结的方法制备了稀土 钼烧结体阴极材料,并测试了材料的发射性能。通过XRD和SEM对材料进行了物相、元素分布与含量的研究。测试结果表明用SPS烧结方法制备的稀土-钼阴极材料的次级发射系数达到3.84,比常规烧结方法制备的阴极材料的次级发射系数(2.92)大很多。用SPS烧结的方法可得到晶粒比较细小且分布比较均匀的烧结体,并发现材料经过1600℃的高温激活后稀土元素将富集于材料的表面,在表面形成一厚为5μm左右的稀土氧化物薄膜。Rare earth molybdenum powder was processed by liquidsolid metallurgy, and the rare earth molybdenum cathode materials was prepared by spark plasma sintering (SPS) method in this paper. The secondary emission property was measured. The microstructure and the distribution on the materials surface were studied through XRD and SEM method. The results show that the secondary emission coefficients of the materials sintered by SPS can reach 3.84 more than those of the materials sintered by traditional method (2.92). The grain can be fined and the elements of the materials sintered by SPS can be distributed evenly. The results also show that rare earth elements would segregate on the surface after activated at 1600℃.

关 键 词：稀土-钼粉末 湿法冶金 SPS 阴极材料 发射性能 XRD SEM 次级发射 微观结构 

分 类 号：TF125.24[冶金工程—粉末冶金]