Title :
Tungsten-rhenium mixed metal matrix cathodes
Author :
Ravi, M. ; Kumar, Santhosh K. ; Bhat, K.S.
Author_Institution :
Microwave Tube R&D Centre, Bangalore, India
Abstract :
In this paper, studies are carried out on W-Re mixed matrix cathodes developed in house, will be discussed. It has been observed that a proper choice of rhenium particle size is essential for obtaining good emission density. The cathodes have been prepared by impregnating W-Re (50%-50% by weight) mixed metal matrices with 5:3:2 barium calcium aluminates. A current density of 20 A/cm2 has been achieved at 1360K. Life testing of these cathodes has been carried out in closely spaced diode configuration. Variation of work function and emission current density after 35000 Hrs of life will be presented.
Keywords :
cathodes; electron emission; life testing; rhenium; tungsten alloys; work function; W-Re; good emission density; life testing; mixed metal matrix cathodes; temperature 1360 K; time 35000 hr; work function; Anodes; Cathodes; Current density; Materials; Metals; Temperature measurement; Thermionic Emission; dispenser cathodes; mixed metal matrix;
Conference_Titel :
Vacuum Electronics Conference (IVEC), 2011 IEEE International
Conference_Location :
Bangalore
Print_ISBN :
978-1-4244-8662-5
DOI :
10.1109/IVEC.2011.5746864
