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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 9    No. 2    June 1999

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THERMIONIC EMISSION OF CARBONIZED La-Mo CATHODE
Nie Zuoren, Zhou Meiling, Wang Jinshu, Zhang Jiuxing and Zuo Tieyong

School of Materials Science and Engineering,BeijingPolytechnic University, Beijing100022, P. R. China

Abstract:Lanthanum-containing cathodes are an attractive alternative to thorium tungsten cathodes because of their low work function and their comparatively low operating temperatures. A La-Mo carbonized cathode was described, which had a high thermionic emission; it was made up in a similar way to the Th-Wcathode, but possesses high emission values. The thermionic tube equipped with La-Mo carbonized cathode was designed for comparison with Th-W cathode tube. It was experimentally verified that La-Mo cathode has higher thermionic emission effectiveness and its operating temperature is about 200℃lower than that of Th-Wcathode. The emission current density of La-Mo wire satisfies for electron tubes as Th-W filament. Astable emission current has been obtained with La-Mo carbonized cathode tubes for more than 1 800 h. From the results it is clear that the emission stability of La-Mo cathode satisfies the requirements for the replacement of  Th-W filament.

 

Key words: cathode rare-earth molybdenum thermionic emission La2O3

ISSN 1672-7029
CN 43-1423/U

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