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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 6    No. 4    December 1996

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THERMODYNAMIC ANALYSIS OF Mo-La2O3 THERMIONIC CATHODE WIRE
Zhou Meiling, Wang Jinshu, Zhang Jiuxing,Nie Zuoren, Li Er, Zuo Tieyong

Department of Materials Science and Engineering,BeijingPolytechnic University, Beijing100022

Abstract:Both thermodynamic calculation and experimental observation show that no elemental lanthanum can be obtained by reduction or thermal decomposition at high temperature. The emission mechanism of Mo-La2O3(Mo-La) cathode is much different from the mono-atomic layer mechanism of Th-W cathode. A new emission mechanism of Mo-La cathode has been put forward, which can reasonably explain the emission behavior of Mo-La2O3 cathode.

 

Key words: molybdenum La2O3 cathode thermodynamics

ISSN 1672-7029
CN 43-1423/U

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