THERMAL AND MECHANICAL PROPERTIES OF A NONDEGRADED AND THERMALLY DEGRADED PHENOLIC-CARBON COMPOSITE

摘要

The thermophysical property study of a phenolic-carbon (fiber) material, designated as Narmco 4028, was performed under Master Agreement Contract NAS 1-5448, Task Order 3. Both the nondegraded (virgin) and thermally degraded (charred) forms were evaluated over temperature ranges of -200°F (144°K) to 750°F (673°K) for the virgin material and 1000°F (811°K) to 5000°F (3033°K) for the charred material. The thermally degraded material was prepared in an induction plasma torch with a heat flux density of 170 Btu/ft2/ sec (193 x 104 watts/m2). Some chars for the thermal conductivity evaluations were made in a high temperature furnace.nThe bulk and true densities of the virgin material were 85. 4 lb /ft3 (1368 kg/m3) and 85. 5 lb/ft3 (1369 kg/m3), respectively, indicating the porosity was nil. The bulk and true densities (obtained by pulverizing bulk pieces) of the plasma char were 73.9 lb/ft3 (1184 kg/m3) and 93.0 lb/ft3 (1490 kg/m3), respectively, indicating a porosity of 20%. The furnace char had a somewhat higher porosity.