高温におけるウランと黒鉛の反応に関する研究

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タイトル別名
  • Studies on the Reaction of Uranium with Graphite at High Temperatures
  • コウオン ニ オケル ウラン ト コクエン ノ ハンノウ ニ カンスル ケンキュウ

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The reaction of uranium metal with graphite was studied in the temperature range of 800°∼1100°C. It was found that the reaction rate was parabolic and the activation energy for the reaction was 59 kcal/mole. Marker experiments showed that the growth of carbide film was caused mainly by the migration of carbon. From these results, the rate determining process of the reaction seems to be the diffusion of carbon across the carbide film formed on the metal surface. Hydrocarbon, yielded by hydrolysis of the carbide film, was analysed by gas-chromatographic method, from which results it was confirmed that the film formed in this temperature range was composed of UC only. X-ray diffraction patterns of the carbide films did not show the existence of U2C3 and UC2. From these parabolic rate constants, self-diffusion coefficients of carbon in UC were calculated. The results were extrapolated and found to agree well with the current results obtained by tracer technique.

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