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SNAP 29 power supply system. Ninth quarterly progress report

Description: Progress during the period from Oct. through December 1968 in the development of the SNAP 29 battery, a radioisotope-fueled thermoelectric generator (RTG) system for spacecraft power supplies, is reported. Information is included on: fabrication and testing of RTG components; systems evaluation and integration; reliability analysis and prediction; reentry trajectory and heating rates for various burn-up element configurations; and system safety evaluation. (LCL)
Date: January 1, 1969
Partner: UNT Libraries Government Documents Department

Artificial Heart Pump (Additional Endogenous Heat) Program

Description: Three plutonium-238 radioisotope-powered heat sources were developed and fabricated at Mound Laboratory for use by Thermo Electron Engineering Corporation (TEECO) in the Artificial Heart Pump (Additional Endogenous Heat) Program. These sources contained doubly encapsulated plutonum-238 metal; two had a thermal power of 15(+2-0) W and one had 25(+0-2) W. Details of the design, fabrication, and testing of the heat sources are given in this report. Two of the heat sources (one 15-W and one 25-W) were shipped to TEECO for use with special heat exchangers in implantation experiments on dogs at Boston City Hospital. These tests have been under way since July, 1967. The third heat source (15-W) was fabricated for in-house testing at Mound Laboratory.
Date: January 27, 1969
Creator: Davis, N. E.; Davenport, C. H. & Kelly, D. P.
Partner: UNT Libraries Government Documents Department

High-temperature ceramic-to-metal seal development

Description: A ceramic-to-metal seal was developed capable of operation up to 1200 deg C in a cesium environment. A new metallizing technique based on a promising tungsten--yttria system reported by LASL, was studied. Effects of mixture age, delay time between metallizing and brazing, and high-temperature outgassing were measured and found critical to the final joint strength. Seals were prepared by brazing metallized Lucalox to niobium with a 60 vanadium--40 niobium braze alloy. A complex braze thermal history was required for a high-strength joint. A seal coat was developed which inhibits corrosive interaction between the braze alloy and alumina at high temperatues. With careful control of metallizing and brazing techniques, room-temperature joint strengths equivalent to or better than early 700 deg C seals were obtained. Seals were subjected to thermal stability and cesium corrosion proof tests; they remained leak tight. (40 figures) (auth)
Date: February 10, 1969
Creator: Chin, J. & Messick, C.W.
Partner: UNT Libraries Government Documents Department