Title :
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
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 PCs=10-1-103 Pa. The experimental dependences of the breakdown voltage of the brazed units on the temperature, the parameter PCs×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;
Conference_Titel :
Energy Conversion Engineering Conference, 1989. IECEC-89., Proceedings of the 24th Intersociety
Conference_Location :
Washington, DC
DOI :
10.1109/IECEC.1989.74380
