| La2O3-Gd2O3-Mo secondary emission material |
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| 作者姓名： | 王金淑 刘娟 周美玲 李洪义 张久兴 左铁镛 |
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| 作者单位： | SchoolofMaterialsScienceandEngineering,BeijingPolytechnicUniversity,Beijing100022,China |
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| 基金项目： | Project(G19980 6 1316 )supportedbytheNationalKeyFundamentalResearchProgramofChina，project( 95 4810 70 0 )supportedbyBeijingNewStarResearchProgramofChina，project( 2 992 0 0 6 )supportedbyBeijingFundamentalResearchProgramofChina |
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| 摘 要： | A new kind of materials La2O3-Gd2O3-Mo has been produced by powder metallurgy method.The composition and microstructure of the material were studied by XRD and SEM.It shows that no chemical reaction takes place among La2O3,Gd2O3,Mo and the rare earth oxides exist along molybdenum grain boundaries and in the pores.The emission property measurement results of this material show that adding rare earth oxide into molybdenum can improve the secondary emission coefficient of the emitter,and the emission property depends on the activation temperature.After La2O3-Gd2O3-Mo was activated at 1360℃,the maximum secondary emission coefficient can be high to 2.62,which has exceeded that for practical uses(2.0).
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| 关 键 词： | La2O3-Gd2O3-Mo 三氧化二镧-三氧化二钇-钼 次发射材料 阴极 稀土氧化物 磁控管 |
La2O3-Gd2O3-Mo secondary emission material |
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| WANG Jin-shu,LIU Juan,ZHOU Mei-ling,LI Hong-yi,ZHANG Jiu-xing,ZUO Tie-yong.La2O3-Gd2O3-Mo secondary emission material[J].Transactions of Nonferrous Metals Society of China,2003,13(1):38-41. |
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| Authors: | WANG Jin-shu LIU Juan ZHOU Mei-ling LI Hong-yi ZHANG Jiu-xing ZUO Tie-yong |
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| Abstract: | A new kind of materials La2O3-Gd2O3-Mo has been produced by powder metallurgy method. The com-position and microstructure of the material were studied by XRD and SEM. It shows that no chemical reaction takesplace among La2O3, Gd2O3, Mo and the rare earth oxides exist along molybdenum grain boundaries and in thepores. The emission property measurement results of this material show that adding rare earth oxide into molybde-num can improve the secondary emission coefficient of the emitter, and the emission property depends on the activa-ting temperature. After La2 O3-Gd2 O3-Mo was activated at 1360 ℃, the maximum secondary emission coefficient canbe high to 2.62, which has exceeded that for practical uses(2.0). |
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| Keywords: | La 2O 3-Gd 2O 3-Mo secondary emission cathode |
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