DocumentCode :
2924157
Title :
Scandia doped impregnated cathode prepared with hollow tungsten spheres
Author :
Wang, Jinshu ; Cui, Yuntao ; Liu, Wei ; Wang, Xi ; Wang, Yiman ; Zhou, Meiling
Author_Institution :
Coll. of Mater. Sci. & Eng, Beijing Univ. of Technol., Beijing, China
fYear :
2012
fDate :
24-26 April 2012
Firstpage :
43
Lastpage :
44
Abstract :
The scandia doped tungsten powders have been obtained by a new method of spray drying combined with two-step reduction in hydrogen atmosphere. Based on the powders, the cathode impregnated with 612 aluminates (SDI-612) has excellent emission capability of 72.2A/cm2 at 900oCb, moreover, the SDI-612 cathode has a lower evaporation rate of 8.45*10-9g.cm-2s-1 at 1150oCb.
Keywords :
aluminium compounds; cathodes; drying; powders; scandium compounds; spraying; tungsten; Al2O3-Sc2O3:W; SDI-612 cathode; hollow tungsten sphere; powder; scandia doped impregnated cathode preparation; spray drying method; temperature 1150 degC; temperature 900 degC; two-step hydrogen atmosphere reduction; Barium; Calcium; Cathodes; Educational institutions; Powders; Surface treatment; Tungsten; Scandia doping; cathode; emission property; tungsten;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Vacuum Electron Sources Conference (IVESC), 2012 IEEE Ninth International
Conference_Location :
Monterey, CA
Print_ISBN :
978-1-4673-0368-2
Type :
conf
DOI :
10.1109/IVESC.2012.6264159
Filename :
6264159
Link To Document :
https://search.ricest.ac.ir/dl/search/defaultta.aspx?DTC=49&DC=2924157
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