Electric strength of metal-ceramic brazed units of thermionic energy converters in caesium vapours

Author

Belousenko, A.P. ; Vasilchenko, A.V. ; Nikolaev, Y.V.

Author_Institution

Res. Technol. Inst., Podolsk, USSR

fYear

1989

fDate

6-11 Aug 1989

Firstpage

2743

Abstract

The electric strength characteristics of the hollow metal-ceramic brazed units of thermionic energy converters have been investigated. The insulators was polycrystalline aluminum oxide of length l=10-50 mm, and measurements were made at temperature T=450-750°C and the caesium vapor pressure P_Cs=10^-1-10³ Pa. The experimental dependences of the breakdown voltage of the brazed units on the temperature, the parameter P_Cs×l, and the value of the surface electric resistance of the insulators are given as well as the empirical equations obtained from the experimental data for calculating the breakdown voltage. A mechanism explaining the influence of the ceramic insulator on the electric strength characteristics of the caesium gap has been investigated. A breakdown model that includes this influence is proposed

Keywords

ceramics; electric breakdown of solids; electric strength; insulation testing; insulators; thermionic conversion; 1×10^-1 to 10³ Pa; 10 to 50 mm; 450 to 750 degC; Al₂O₃; breakdown; ceramic insulator; electric strength; empirical equations; metal-ceramic brazed units; model; surface electric resistance; thermionic energy converters; Aluminum oxide; Ceramics; Dielectrics and electrical insulation; Electric resistance; Electric variables measurement; Equations; Length measurement; Pressure measurement; Surface resistance; Temperature dependence;

fLanguage

English

Publisher

ieee

Conference_Titel

Energy Conversion Engineering Conference, 1989. IECEC-89., Proceedings of the 24th Intersociety

Conference_Location

Washington, DC

Type

conf

DOI

10.1109/IECEC.1989.74380

Filename

74380