Accession Number : AD0724592

Title :   THERMOPHYSICAL PROPERTIES AT HIGH TEMPERATURES MEASURED BY DIRECT HEATING METHODS.

Descriptive Note : Technical rept., 1 Jul 69-31 Oct 70,

Corporate Author : THERMOPHYSICAL AND ELECTRONIC PROPERTIES INFORMATION ANALYSIS CENTER LAFAYETT E IN

Personal Author(s) : TAYLOR, Raymond E.

Report Date : DEC 1970

Pagination or Media Count : 69

Abstract : An analysis of direct heating methods, in which the sample is heated by passing an electric current through it, is presented. These methods are used for measuring thermophysical properties at high temperatures. It was demonstrated that mathematical approximations severly limit the applicability and accuracy of the techniques described in the literature. However, new techniques developed under the present program do not employ severe mathematical approximations and correctly include temperature-dependent properties. Thus the new techniques are significantly more accurate and orders of magnitude more flexible than the previous techniques. Data on the thermal conductivity, electrical resistivity, hemispherical total emittance, spectral normal emittance (0.65 microns) and Wiedemann-Franz-Lorenz ratio for two samples of Ta - 10W alloy to 2600 K are presented. Accuracies are believed to be within plus or minus 1% for the electrical resistivity, plus or minus 2% for the emittance and plus or minus 4% for thermal conductivity. Progress on the development of an apparatus to measure the thermal conductivity of carbon/graphite fiber is described. (Author)

Descriptors :   *THERMAL PROPERTIES, *TANTALUM ALLOYS, TEST METHODS, HIGH TEMPERATURE, THERMAL CONDUCTIVITY, ELECTRICAL RESISTANCE, EMISSIVITY, EQUATIONS OF STATE, COMPUTER PROGRAMMING, TABLES(DATA), TUNGSTEN ALLOYS, HEAT RESISTANT MATERIALS.

Subject Categories : Fabrication Metallurgy
      Training Aircraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE