Synthesis and properties of CeB6 thermionic cathode with {001} fiber texture by reactive spark plasma sintering method

Author

Zhou, S.L. ; Zhang, J.X. ; Liu, D.M. ; Bao, L.H. ; Wei, Y.F. ; Ma, R.G. ; Huang, Q.Z.

Author_Institution

Key Lab. of Adv. Functional Mater., Beijing Univ. of Technol., Beijing, China

fYear

2010

fDate

14-16 Oct. 2010

Firstpage

172

Lastpage

174

Abstract

In this paper, a study on quick spark plasma sintering (SPS) method for synthesizing the polycrystalline CeB<;sub>6<;/sub> bulk is presented. CeB<;sub>6<;/sub> is the material of choice for high current density cathode. However, in fact, because of the long sintering time and high temperature, the traditional hot pressure sintering preparation of polycrystalline CeB<;sub>6<;/sub> bulk causes coarse grains and low density which decrease the emission property. The pulsed voltage method was used to test the electron emission of the CeB₆. The pulse thermionic emission density was measured with increasing voltages up to 1000 V at various cathode temperatures from 1500 K to 1863 K, at pressure of 2x10^-4 Pa, a pulse width of 20 μs and repetition frequency of 120 Hz.

Keywords

cerium compounds; electron field emission; fibres; plasma materials processing; sintering; texture; thermionic cathodes; thermionic electron emission; CeB₆; electron emission; fiber texture; frequency 120 Hz; high current density cathode; polycrystalline bulk materials; pressure 0.0002 Pa; pulsed voltage method; reactive spark plasma sintering; temperature 1500 K to 1863 K; thermionic cathode; thermionic emission density; time 20 mus;

fLanguage

English

Publisher

ieee

Conference_Titel

Vacuum Electron Sources Conference and Nanocarbon (IVESC), 2010 8th International

Conference_Location

Nanjing

Print_ISBN

978-1-4244-6645-0

Type

conf

DOI

10.1109/IVESC.2010.5644401

Filename

5644401