摘要
A new kind of materials La 2O 3-Gd 2O 3-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 La 2O 3, Gd 2O 3, 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 activating temperature. After La 2O 3-Gd 2O 3-Mo was activated at 1 360 ℃, the maximum secondary emission coefficient can be high to 2.62, which has exceeded that for practical uses(2.0).
A new kind of materials La 2O 3-Gd 2O 3-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 La 2O 3, Gd 2O 3, 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 activating temperature. After La 2O 3-Gd 2O 3-Mo was activated at 1 360 ℃, the maximum secondary emission coefficient can be high to 2.62, which has exceeded that for practical uses(2.0).
出处
《中国有色金属学会会刊：英文版》
CSCD
2003年第1期38-41,共4页
Transactions of Nonferrous Metals Society of China
基金
Project(G19980 6 1316 )supportedbytheNationalKeyFundamentalResearchProgramofChina
project( 95 4810 70 0 )supportedbyBeijingNewStarResearchProgramofChina
project( 2 992 0 0 6 )supportedbyBeijingFundamentalResearchProgramofChina
