Title :
Study on the emission properties of Re-W thermionic dispenser cathode
Author :
Chen Lai ; Jinshu Wang ; Fan Zhou ; Wei Liu
Author_Institution :
Sch. of Mater. Sci. & Eng., Beijing Univ. of Technol., Chaoyang, China
Abstract :
In this study, tungsten-rhenium (Re-W) dispenser cathodes are fabricated by cold-pressing and sintering of Re-W powder which was prepared by spray drying method followed by two-step hydrogen reduction. Emission performance of the cathodes was tested on a planar diode configuration. The elements distribution of rhenium and tungsten on the surface of 75at%Re-W cathode were also investigated by EPMA. Among the cathodes fabricated in different compositions, the 75at% Re-W cathode demonstrates the highest zero field emission current density of 14.03 A cm-2 at 1000 °C.
Keywords :
drying; powder technology; rhenium; spraying; thermionic cathodes; tungsten; ReW; cold-pressing; elements distribution; emission properties; planar diode configuration; sintering; spray drying method; thermionic dispenser cathode; two-step hydrogen reduction; zero field emission current density; Cathodes; Films; Surface morphology; Surface treatment; Transmission line matrix methods; X-ray scattering; W-Re mixed matrix; dispenser cathode; emission current density; two-step reduction;
Conference_Titel :
Vacuum Electronics Conference (IVEC), 2015 IEEE International
Conference_Location :
Beijing
Print_ISBN :
978-1-4799-7109-1
DOI :
10.1109/IVEC.2015.7223924
