Transactions of Nonferrous Metals Society of China
JOURNAL OF RAILWAY SCIENCE AND ENGINEERING
|Vol. 12 No. 1 February 2002|
（The Key Laboratory of Advanced Functional Materials for
Ministry of Education, Beijing Polytechnic University,
Beijing 100022, China）
Abstract:The recent advances in Mo-La2O3 thermionic cathode materials were presented.It is shown that Mo-La2O3 cathode has better ductility,radioactive pollut ion-free,excellent thermionic electron-emission properties and lower operating temperature compared with W-ThO2 cathode. At operating temperature 1350～1400℃,the average saturation current of the Mo-La2O3 cathode is 118mA,the corresponding average current density is 367mA/cm2,and the average emission efficiency is 11.8mA/W.The lifetime of diode is more than 2000h when the stable emission current is 80mA.More over,the lifetime of practical 6T51-type triode is more than 1000h.These advances show that the Mo-La2O3 cathode electron tube is closer to industry application.
Key words: molybdenum;rare earth oxide;cathode;thermionic emission