Reactions Between Silica and Graphite

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Abstract
Reactions between silica and graphite were studied in vacuum from 1445° to 1765°C by continuously measuring the amount of carbon monoxide formed. At low temperatures and/or short times, the reaction followed a linear rate law with an apparent activation energy of 117 kcal. At higher temperatures and/or longer times, the reaction showed a more complex behavior, indicative of a nucleation‐growth process with an apparent activation energy of 122 kcal. It is shown that the reaction could proceed via the gas phase by dissociation of silica into oxygen and silicon monoxide and subsequent reaction with graphite. The onset of the nucleation‐growth‐controlled process could be correlated with the transformation of quartz to cristobalite.

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