Title :
Improvement of mechanical strength for Nanosized-Scandia Doped Dispenser cathodes
Author :
Xiaoce Zhu ; Yiman Wang ; Wei Liu ; Fan Yang ; Xiang Liu ; Jinshu Wang
Author_Institution :
Sch. of Mater. Sci. & Eng., Beijing Univ. of Technol., Beijing, China
Abstract :
In order to improve the mechanical strength and machining properties of Scandia Doped Dispenser (SDD) cathodes when they are applied into Vacuum Electron Devices (VEDs), an effort has been expended to increase the W grain sizes while maintaining the uniform doping of nanosized Scandia particle. By an improved liquid-solid (L-S) doping process, powders composed of W grains of about 1-2 micron in diameters with uniformly distributed nanosized scandium oxide particles have been fabricated. Cathodes constructed by above powders exhibited better properties in machining operations like lathing, and similar emission characteristics to that of SDD cathodes made from the powders with liquid-liquid doping methods.
Keywords :
cathodes; mechanical strength; scandium compounds; semiconductor doping; tungsten; L-S doping process; SDD cathode; VED; W; liquid-solid doping process; machining property; mechanical strength; nanosized-scandia doped dispenser cathode; tungsten grain; vacuum electron device; Cathodes; Doping; Machining; Powders; Temperature measurement; Tungsten; electron emission; mechanical strength; scandate cathodes; vacuum electron device;
Conference_Titel :
Vacuum Electronics Conference (IVEC), 2015 IEEE International
Conference_Location :
Beijing
Print_ISBN :
978-1-4799-7109-1
DOI :
10.1109/IVEC.2015.7223903
