Accession Number : AD0474409

Title :   HIGH TEMPERATURE THERMOELECTRIC RESEARCH.

Descriptive Note : Quarterly progress rept. no. 4, 2 Aug-29 Oct 65,

Corporate Author : MONSANTO RESEARCH CORP DAYTON OH

Personal Author(s) : Henderson, C. M. ; Ault, R. G. ; Beaver, E. R. ; Harris, D. H. ; Janowiecki, R. J.

Report Date : 29 OCT 1965

Pagination or Media Count : 78

Abstract : This report describes applied research directed toward utilizing high-temperature thermoelectric generators for spaceflight vehicle power supplies. Further investigations of the effect of dislocation scattering of phonons because of localized strain in the matrix of thermoelectric materials indicate that the dispersed particles should be as small as 0.02A. Metallographic examinations of segmented TE legs, exposed to 4000 hrs operation at hot junction of 1200 C showed that the junction between some of the n-type MCC 60 and MCC 40 segments had been overheated. Improved high-temperature measurements of the thermal diffusivity of MCC60 indicated that its thermal conductivity was substantially higher than had been previously determined. Specific heat measurements at temperatures ranging from ambient to 1200 C were completed on each MCC thermoelectric material. Disc-shaped TE elements with arc-plasma sprayed coatings to 1/4 inch thickness were successfully produced, and several conceptual generator designs for use with isotope heat sources were reported. (Author)

Descriptors :   *GENERATORS), (*THERMOELECTRICITY, (*POWER SUPPLIES, SPACECRAFT), ENERGY CONVERSION, HEAT RESISTANT MATERIALS, HIGH TEMPERATURE, MANUFACTURING, THERMAL DIFFUSION, PERFORMANCE(ENGINEERING), THERMAL PROPERTIES, THERMAL CONDUCTIVITY, SPECIFIC HEAT, ENTHALPY, SPACE FLIGHT.

Subject Categories : Electric Power Production and Distribution

Distribution Statement : APPROVED FOR PUBLIC RELEASE