Design and Weaving of Experimental Carbon Fabrics.
Technical rept. Jul 78-Jan 80,
CELANESE RESEARCH CO SUMMIT N J
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Polyacrylonitrile PAN preoxidized fibers were processed and subsequently woven into various carbon fabrics of low thermal conductivity. The axial thermal conductivity of the yarn variants was determined using a Colora thermoconductometer. The values ranged from 0.0072 calcm-sec-deg C to 0.0128 calcm-sec-deg. C and three of the variants met the thermal conductivity target of 0.010 calcm-sec-deg C or less. Fiber densities and carbon contents exceeded the targets because of the pyrolysis temperature used. At the specified pyrolysis temperature, 1075 C, the more critical thermal conductivity requirement was met, but at the expense of density and carbon content. The density of the fibers examined ranged from 1.742 gcc to 1.789 gcc. The carbon composition of the fabrics ranged from 79.86 to 86.17. Cost estimates for reproducing each of the fabrics studied on a commercial scale were prepared. The estimates ranged from 35.54yd. to 85.74yd. The effects of increasing the yarn size and also fabric weaving prior to carbonization were examined from both a cost and physical properties standpoint.