| Thermionic properties of Mo-La_2O_3 cathode wires |
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| 作者姓名： | 张久兴 周美玲 周文元 王金淑 聂祚仁 左铁镛 |
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| 作者单位： | The Key Laboratory of Advanced Functional Materials for Ministry of Education,Beijing Polytechnic University, Beijing 100022, China |
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| 基金项目： | Project (G19980 6 1316 )supportedbytheStateKeyFoundamentalResearchandDevelopmentProgram，project( 95 2 872 2 0 0 )supportedbytheBeijingScienceandTechnologyStarProgram |
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| 摘 要： |
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Thermionic properties of Mo-La2O3 cathode wires |
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| Abstract: | The recent advances in Mo-La2O3 thermionic cathode materials were presented. It is shown that Mo-La2O3 cathode has better ductility, radioactive pollution-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. Moreover, 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. |
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| Keywords: | molybdenum rare earth oxide cathode thermionic emission |
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