Advances in Thermionic Cathode of Tungsten and Molybdenum

作     者：Jinshu Wang,Meiling Zhou, Tieyong Zuo, Juan Liu, Jiuxing Zhang, Zuoren Nie The Key Laboratory of Advanced Functional Materials, Ministry of Education, School of Materials Scence and Engineering, Beijing Polytechnic University, Beijing 100022, China Jinshu Wang,Meiling Zhou, Tieyong Zuo, Juan Liu, Jiuxing Zhang, Zuoren Nie The Key Laboratory of Advanced Functional Materials, Ministry of Education, School of Materials Scence and Engineering, Beijing Polytechnic University, Beijing 100022, China

作者机构：北京工业大学 教育部新型功能材料重点实验室 北京 100022. 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2001年第20卷第3期

页      面：137-141页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0702[理学-物理学] 

基　　金：This work was financially supported by the National Key Fundamental Research Program (973) G1998061316 and theYoung Researcher 

主　　题：tungsten molybdenum thermonic cathode emission 

摘      要：Several kinds of tungsten thermonic cathodes have been introduced. As a promising alternative for thoriated tungsten, rare earth doped molybdenum cathode has been studied. Compared with the traditional thoriated tungsten, La-Mo cathode has higher emission current density at lower temperature, but it has poor emission stability. In order to improve the emission stability, systematical study on the emission mechanism of La-Mo cathode has been carried out. The life of La-Mo cathode has been improved and has achieved 1400 It, which exceeds the minimum life for practical uses (1000 h). As another alternative for thoriated tungsten cathode, Y-Mo cathode has shown better performance. The thermionic emission capability of Y-Mo cathode is between that of La-Mo cathode and Th-W cathode.