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The effect of refractory oxides on the oxidation of graphite and amorphous carbon was investigated. Al 2 O 3 accelerated the oxidation of graphite greatly. TiO 2 , ZrO 2 , and MgO inhibited the oxidation of graphite, while SiO 2 inhibited the oxidation of graphite slightly. The above oxides had no effect on the oxidation of amorphous carbon.
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Yamaguchi et al. (1996) studied this question.
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