Coefficients of thermal expansion for a carbon-carbon composite

Abstract

From the published data, carbon-carbon composites possess many unique properties at high temperature. They retain their room temperature strength in excess of 2200{degrees}C. The low coefficients of thermal expansion (CTE) and the property of non-wetting by molten metals make carbon-carbon composites excellent candidates for applications in the LIS program. Among these unique properties, CTE is the most important factor for the LIS program. In seeking to evaluate typical CTE's we obtained complementary samples of selected carbon-carbon specimens. These samples were laminates with (0{sub 2}){sub s}, (0{sub 2}90{sub 2}){sub s} and ({plus minus}45){sub s} orientations. These results indicated that the selected carbon-carbon composites are almost isotropic in thermal expansion. The CTE's are slightly negative at low temperature and become positive at high temperature. The exact values are shown in the figures. In order to determine the outgassing of carbon-carbon composites, two samples were tested in vacuum. The results have shown that the outgassing can not be neglected. 8 figs.

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