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ALKALI METAL RESISTANT ELECTRICAL DEVICES
WESTINGHOUSE ELECTRIC CORP LIMA OH AEROSPACE ELECTRICAL DIV
This program involves the study and evaluation of electrical device material for 600 C, 5000-hour, potassium vapor operation. Conductors, insulators, and magnetic materials capable of being used in potassium vapor exposed electrical circuits will be exposed to 600 C potassium vapor for times up to 5000 hours. Specimens were prepared and given pre-exposure tests. Capsules for potassium vapor exposure tests were fabricated. Hiperco 27 alloy for use in transformers was evaluated. Rowland ring core box sides were fabricated and ceramic ends were ordered. A continuous measurement container for conductor evaluation was designed and material ordered. Short term potassium vapor exposure tests were run on selected ceramic and ceramicmetal interface specimens, and test results evaluated. Alumina-titanium-Hiperco 27 alloy test specimens were not appreciably affected by the 600 C potassium vapor. Attempts were made to fabricate ceramicmetal electrical feed throughs using rhodium and alumina powders and cold and hot pressing techniques. Three configurations for brazing columbium-1 zirconium to sapphire windows were evaluated. Leak tight seals were not obtained.
Quarterly technical progress rept. no. 2, 26 Sep-25 Dec 1966
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