RESEARCH STUDIES ON THERMIONIC CONVERTERS, EMITTER SHELL PHASE.
Quarterly technical rept. no. 4, 1 Apr-15 Dec 64,
RADIO CORP OF AMERICA LANCASTER PA
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Eighteen converters were fabricated, 16 with the doublewalled emitter-shell geometry. After the solution of a number of fabrication problems, a converter was constructed which produced power output equivalent to electrically heated converters. This converter was successfully life tested for 1000 hours at an average emitter temperature of 1235 Centigrade. A second converter was life tested at an emitter temperature of 1320 Centigrade for 202 hours before failing. A converter was subjected to thermal cycling from -40 Centigrade to 1400 Centigrade in less than 5 minutes without failure in accordance with the contract requirements. Permeation testing was carried out on an aluminum oxide sample in a fossil-fuel environment. The principle permeating gas was shown to be oxygen. Tests on pyrolytic silicon carbide were being conducted as the reporting period closed.