The chemical reactions of siliconizing of steel with silicon tetrachloride atmospheres were investigated. The effects of gas flow rate, temperature and time on weight change differed, whether the atmosphere was a reducing gas as hydrogen or neutral gas. The reaction rate of siliconizing of steel showed a discontinuity near 900°, and decreased rapidly by compound formation. On thermodynamic data of reactions between iron and silicon tetrachloride, the experimental results were discussed.
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