均匀掺杂稀土钼粉的制备  

Preparation of Mo Powder Uniformly Doped with Rare Earth Elements

作　　者：刘燕琴[1] 刘伟[1] 周美玲[1] 王金淑[1] 崔颖[1] 

机构地区：[1]北京工业大学新型功能材料教育部重点实验室,北京100022

出　　处：《稀有金属》2004年第3期598-601,共4页Chinese Journal of Rare Metals

基　　金：国家重点基础研究发展规划基金资助项目 ( 973 )项目 (G19980 613 13 2 ) ;霍英东青年教师基金资助计划 ( 810 40 )

摘　　要：采用溶胶凝胶 (Sol Gel)和两步氢还原法 ,成功制备了掺杂复合RE2 O3(RE2 O3=La2 O3+Y2 O3)的稀土钼粉末 ,采用XRD ,TEM分析手段对还原后的粉末成分、形貌、粒度等进行分析。结果表明 :所制备的粉末中 ,Mo是以单质形式出现 ,RE元素以氧化物形式存在 ,稀土钼粉末粒径在 70nm左右。采用放电等离子快速烧结方法 (SPS)制备了致密样品 ,对样品表面和截面的稀土元素分布情况分析表明稀土元素分布非常均匀。The RE(RE=La, Y)-Mo powder was successfully prepared by the sol-gel method after the twice step reduction. The composition, topography and granularity of the powder were studied by the XRD, SEM experimental methods. The results show that the molybdenum appears as simple substance and the RE elements exist in the form of REO after the reduction. The aggregation phenomenon is observed. The results also show that the granularity of the RE-Mo powder is about 70 nano-meters. The sample was sintered by the spark plasma sintering method (SPS). The distribution of RE elements at the surface and cross-section was investigated. The result shows the uniform distribution of RE elements.

关 键 词：溶胶凝胶 稀土氧化物 钼 次级发射阴极 

分 类 号：TG146.4[一般工业技术—材料科学与工程]