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Materials for High Pressure Nozzles. Volume III. Property Determination of Castable Carbon and Graphite Fiber-Reinforced Pyrolytic Graphite Composite
ATLANTIC RESEARCH CORP ALEXANDRIA VA
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The thermal conductivity and specific heat of castable carbon ablative material and carbon fiber reinforced pyrolytic graphite composite sleeves were determined. Measurements above ambient on castable carbon were conducted on precharred material. Thermal expansion measurements also were made on castable carbon precharred at 4000F. The castable carbon virgin material had a low conductivity of about 12 Btu in.hr square feet 2F, the 1500F prechar had about the same value up to 1500F and the 4000F prechar had a value six to ten times higher. The castable carbon in an isotropic material and these values are intermediate between the conductivities in the two directions for molded carbon- phenolic ablatives. The thermal expansion data indicated that the castable carbon material is stable up to the precharring temperature. The thermal expansion data fall in between with and across grain expansion values for ATJ-S graphite. The heat capacity values for castable carbon and fibrous PG composite are about 10 percent higher than the values for polygraphites.
APPROVED FOR PUBLIC RELEASE