Formation of a silicided layer on steel as the result of saturation in monosilane and silicon tetrachloride
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We have shown the possibility of siliciding low carbon steel in monosilane in the presence of diluting gases H2, N2, Ar, and undissociated NH3. To obtain consistent results we recommend gas siliciding with a previously prepared gas mixture (monosilane+diluting gas). When the steel is silicided in monosilane the diffusion layer consists of a highly developed α-solid solution.
When the steel is silicided in SiCl4 in the presence of nitrogen then the ξ-(FeSi2), ε-(FeSi), and α′-(Fe3Si) phases are formed in the diffusion layer; these phases are very hard. When the ξ-and ε-phases are formed then the amounts of the α′-and α-solid solutions are small.
When steel is silicided in SiCl4 then the structure, the density, and the thickness of the diffusion layer depend on the activity of the medium.
KeywordsNitrogen Silicon Carbon Steel Tetrachloride Diffusion Layer
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