A Study on La2O3-Y2O3-Mo Secondary Emission Material
来源期刊：JOURNAL OF RARE EARTHS2003年第6期
论文作者：周美玲 张久兴 王金淑 李洪义 刘娟 左铁镛
Key words：metal materials; secondary emission; molybdenum; cathode; rare earths;
Abstract: The substrate molybdenum doped with La2O3, Y2O3 cathode material was made by the powder metallurgy method. The secondary emission coefficients of them aterials were tested. The experimental results show that Mocathodes doped with La2O3,Y2O3 have good secondary emission properties. When the cathodes are activated, the maximal secondary emission coefficients of these cathodes are higher than 2.0 and can meet the practical requirement. The distribution of the rare earth in the interior and at surface of this kind of cathode material before and after emission was studied using Scanning Electronic Microscopic (SEM) and X -Ray Photoelectron Spectrum(XPS). The analysis results show that the rare earth is easy to gather at grain boundaries and the relevant concentration of rare earth on the surface after emission is obviously greater than that before emission .
周美玲1，张久兴1，王金淑1，李洪义1，刘娟1，左铁镛1
(1.Key Laboratory of Advanced Functional Materials of Ministry of Education, School of Materials Science and Engineering, Beijing Polytechnic University, Beijing 100022, China)
Abstract:The substrate molybdenum doped with La2O3, Y2O3 cathode material was made by the powder metallurgy method. The secondary emission coefficients of them aterials were tested. The experimental results show that Mocathodes doped with La2O3,Y2O3 have good secondary emission properties. When the cathodes are activated, the maximal secondary emission coefficients of these cathodes are higher than 2.0 and can meet the practical requirement. The distribution of the rare earth in the interior and at surface of this kind of cathode material before and after emission was studied using Scanning Electronic Microscopic (SEM) and X -Ray Photoelectron Spectrum(XPS). The analysis results show that the rare earth is easy to gather at grain boundaries and the relevant concentration of rare earth on the surface after emission is obviously greater than that before emission .
Key words:metal materials; secondary emission; molybdenum; cathode; rare earths;
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