Title :
Impregnation of High purity Ba-Ca aluminate on a porous tungsten matrix obtained from W-Cu composite for TWT thermionic cathodes
Author :
Sene, Frank F. ; Mancini, Victor A. ; Santos, Vinicius O. ; Motta, Claudio C.
Author_Institution :
Nucl. & Energy Res. Inst., São Paulo, Brazil
Abstract :
Impregnated thermionic cathodes production was the main objective of this work. The W-30wt.%Cu composite was sintered by induction heating (1200°C). The porous matrix was obtained after decopperization (1600°C). High purity Ba-Ca aluminate was impregnated (1630°C). The amount of aluminate impregnated was 18.32wt.%. Microstructure, porosity, and particle sizes distribution were determined.
Keywords :
particle size; porosity; porous materials; thermionic cathodes; travelling wave tubes; TWT thermionic cathodes; decopperization; high purity Ba-Ca aluminate; impregnated thermionic cathodes production; particle sizes distribution; porosity; porous tungsten matrix; temperature 1200 degC; temperature 1600 degC; temperature 1630 degC; Barium; Calcium; Cathodes; Copper; Milling; Powders; Tungsten; Induction heating; barium calcium aluminate; thermionic cathode; tungsten-copper composite;
Conference_Titel :
Vacuum Electronics Conference (IVEC), 2013 IEEE 14th International
Conference_Location :
Paris
Print_ISBN :
978-1-4673-5976-4
DOI :
10.1109/IVEC.2013.6571126
