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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 1    February 2002

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Thermionic properties of Mo-La2O3
cathode wires
ZHANG Jiu-xing(张久兴),ZHOU Mei-ling(周美玲),ZHOU Wen-yuan(周文元),
WANG Jin-shu(王金淑),NIE Zuo-ren(聂祚仁),ZUO Tie-yong(左铁镛)

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

ISSN 1672-7029
CN 43-1423/U

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