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The heat capacity and the thermal diffusivity of glassy carbon were measured by a laser flash method at temperatures ranging from 25 to 700°C. The sample was Glassy Carbon GC-30, prepared by the Tokai Electrode Mfg. Co. and reported to have been heat-treated at 3000°C.The heat capacity of GC-30 was almost the same as those of ordinary graphites. The thermal diffusivity was neary constant throughout the measured temperature range, and was lower than those of other graphites. On the other hand, the thermal conductivity, calculated from the heat capacity and the thermal diffusivity data, increased slowly with the temperature increase. The thermal conductivities at 25°C and 700°C were 0.014 and 0.028 (cal/cm. sec. deg), respectively.

Measurement of High-Temperature Thermal Properties of Glassy Carbon by Laser Flash Method