Abstract
Molybdenum can berenderd highly resitsant to oxidation by treatment with a hydrogen-silicon tetrachloride atomosphere so as to produce a molybdenum disilicide coating on its surface. The effects of time, temperature and concentration of silicon tetrachloride on the rate of reaction were investigated at 1000∼1800°. By treating a powder mixture of silicon and molybdenum (in the stoichiometric ratio of MoSi2) either in hydrogen or in silicon tetrachloride atmosphere, the formation of molybdenum disilicide was observable only at the high temperature of 1300° in the former, but at a lower temperature as 1000° in the latter atmosphere. The mechanism of the reaction between molybdenum and silicon tetrachloride, and the process of sintering of molybdenum-silicon powder was interpreted by the formation of silicon dichloride at high temperature.
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