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

fYear

2015

fDate

27-29 April 2015

Firstpage

1

Lastpage

2

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Vacuum Electronics Conference (IVEC), 2015 IEEE International

Conference_Location

Beijing

Print_ISBN

978-1-4799-7109-1

Type

conf

DOI

10.1109/IVEC.2015.7223903

Filename

7223903