稀土难熔金属阴极材料研究进展  

Advances in Rare Earth Doped Refractory Metal Cathode Materials

作　　者：王金淑[1] 刘伟[1] 李娜[1] 古昕[1] 王亦曼[1] 袁海清[2] 李季[2] 

机构地区：[1]北京工业大学材料学院,北京100022 [2]北京真空电子技术研究所,北京100016

出　　处：《真空电子技术》2006年第2期5-9,共5页Vacuum Electronics

基　　金：国家自然科学基金(50571001);霍英东青年教师基金资助项目(81040)

摘　　要：研究了稀土钼阴极的热发射、次级发射及亚微米结构钪钨基扩散阴极的热发射性能.结果表明,La2O3-Mo热阴极具有良好的热电子发射性能并具有抗暴露大气的能力.稀土钼次级发射材料经过1000～1200℃的高温激活处理后,材料的最大次级发射系数超过4.0.湿法冶金方法制备的亚微米结构钪钨基扩散阴极850℃b时电流密度可达47 A/cm^2,且阴极表面的发射均匀性较普通钪酸盐阴极有明显的改善.The thermionic emission properties of rare earth doped molybdenum cathode and impregnated cathode with sub-micron scandia doped tungsten matrix, and the secondary emission property of rare earth doped molybdenum cathode have been studied in this paper. It was shown that La2O3-Mo cathode had good thermionic emission property and the capability of anti-exposition to the atmosphere. The maximum secondary emission coefficient of the rare earth doped molybdenum cathodes activated at 1000-1200℃ could exceed 4.0. The im- pregnated cathodes with sub-micron scandia doped tungsten matrix exhibited excellent emission property. The current densities of more than 30 A/cm^2 at 850℃ b could be obtained, and the emission homogeneity was improved with the ordinary scandate cathode.

关 键 词：稀土 钼 钨 阴极 

分 类 号：O462[理学—电子物理学]