Title :
Scandia doped impregnated cathode prepared by spray drying method
Author :
Jinshu Wang ; Wei Liu ; Yiman Wang ; Fan Yang ; Xiaoce Zhu ; Wenlong Liang
Author_Institution :
Sch. of Mater. Sci. & Eng., Beijing Univ. of Technol., Beijing, China
Abstract :
The scandia doped tungsten powders have been obtained by a new method of spray drying combined with two-step reduction in hydrogen atmosphere. The impregnated cathode prepared with the obtained powders has an excellent emission capability of 121 A/cm2 at 950 °C b in pulsed condition. The DC life test result indicates that the emission current density of 40 A/cm2 has lasted up to 4000 hours.
Keywords :
cathodes; drying; hydrogen; powder technology; spraying; tungsten; DC life test; H; W; cathode; emission current density; powders; spray drying method; temperature 950 C; time 4000 h; Cathodes; Current density; Electron devices; Pulse measurements; Temperature measurement; Tungsten; Scandia doping; cathode; emission property; tungsten;
Conference_Titel :
Vacuum Electronics Conference (IVEC), 2015 IEEE International
Conference_Location :
Beijing
Print_ISBN :
978-1-4799-7109-1
DOI :
10.1109/IVEC.2015.7223868
