Abstract
Pretreatment of graphite with gaseous chlorine at elevated temperatures has been found to result in increased resistance to oxidation in air in the temperature range 600–900°C. The inhibiting effect was most pronounced following chlorination at 800–900°C. Organo-halogen compounds which thermally decompose to give adsorbed halogen on the graphite surface also acted as oxidation inhibitors, when impregnated into graphite or when introduced as vapor into the air stream. Chlorine pretreatment at 800°C resulted in the formation of circular pits on the graphite basal plane surface during subsequent oxidation at 900°C, in contrast to the hexagonal etch pits formed on pure untreated graphite crystals.
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