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기술보고서

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타이틀	Thermophysical Properties of GRCop-84
저자	David L. Ellis and Dennis J. Keller
Keyword	Thermal conductivity; Electrical resistivity; Specific heat; Thermal diffusivity; Cu alloys
URL	http://gltrs.grc.nasa.gov/reports/2000/CR-2000-210055.pdf
보고서번호	NASA CR-2000-210055
발행년도	2000
출처	NASA Glenn Research Center
ABSTRACT	The thermophysical properties and electrical resistivity of GRCop-84 (Cu - 8 at.% Cr-4 at.% Nb) were measured from cryogenic temperatures to near its melting point. The data were analyzed using weighted regression to determine the properties as a function of temperature and assign appropriate confidence intervals. The results showed that the thermal expansion of GRCop-84 was significantly lower than NARloy-Z (Cu-3 wt.% Ag-0.5 wt.% Zr), the currently used thrust cell liner material. The lower thermal expansion is expected to translate into lower thermally induced stresses and increases in thrust cell liner lives between 2X and 41X over NARloy-Z. The somewhat lower thermal conductivity of GRCop-84 can be offset by redesigning the liners to utilize its much greater mechanical properties. Optimized designs are not expected to suffer from the lower thermal conductivity. Electrical resistivity data, while not central to the primary application, show that GRCop-84 has potential for applications where a combination of good electrical conductivity and strength is required.