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 ...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).展开更多
文摘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).
