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Thermal Conductivity of Carbon Materials at High Temperatures by a Modulated Electron Beam Technique

1972; Atomic Energy Society of Japan; Volume: 14; Issue: 6 Linguagem: Inglês

10.3327/jaesj.14.274

2186-5256

Takaho Tanaka, Hiroshige Suzuki,

Thermal properties of materials

The thermal diffusivities of carbon materials were determined over the temperature range from 1, 300° to 1, 900°C, by using the modulating eleciron beam method. The thermal conductivities were calculated from the diffusivity values obtained by this method and the values of heat capacity available in published literature. The resulting data was found to possess anisotropic properties, which were attributable to the method of preparation of the materials. The largest anisotropy was observed in pyrolytic graphite, whose ratio of anisotropy was about 100 in this temperature range. The anisotropy ratio of mold pressed natural graphite was about 3, which larger than that of artificial graphite. The thermal conductivities of glassy carbon appeared to be independent of temperature, and were 2.7×10-2, 2.4×10-2 and 2.2×10-2cal/sec·cm·°C for the qualities called GC-30S, GC-30 and GC-20, respectively.