THE DEVELOPMENT OF AN INSULATED THERMIONIC CONVERTER-HEAT PIPE ASSEMBLY.
Quarterly technical rept. no. 2, Mar-Sep 65,
RADIO CORP OF AMERICA LANCASTER PA DIRECT ENERGY CONVERSION DEPT
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This report covers the development of a long life insulated thermionic converter integrated with an efficient, constant temperature heat transfer device. Specifically, the cylindrical converter is being adapted for heating by means of a heat pipe to operating temperatures of 1500 C. Progress was made in the development of high temperature ceramic-to-metal seals for use in the improved three converter module. High quality cesium was produced, using a purifying device based on heat pipe principles. The effect of xenon on thermionic converter performance was determined at an emitter temperature of 1350 C. Aluminum oxide insulated emitters were tested to 1600 C to determine the electrical and thermal resistance of the tri-layer. The heat pipe test vehicle gave satisfactory performance and produced design data used to fabricate prototype heat pipes. An 1198C converter was fabricated for integration with the heat pipe. Electrical test indicated the need for minor modifications. Author