各種合成クロマイトの炭素還元挙動

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The chromites shown below were prepared synthetically and reduced by graphite powder under a CO atmosphere : FeCr_2O_4(Sp 1), MgCr_2O_4(Sp 2), (Fe_<0.5>Mg_<0.5>)Cr_2O_4(Sp 3), (Fe_<0.5>Mg_<0.5>)(Cr_<0.8>Al_<0.2>)_2O_4(Sp 4), and Mg(Cr_<0.6>Al_<0.4>)_2O_4(Sp 5). The results obtained are as follows : 1) In the case of the pure iron chromite Sp 1, the reduction of FeO component preceded that of Cr_2O_3. With the progress of the reduction, the metallic products changed in the following order : Austenite→austenite+(Fe, Cr)_3C→(Fe, Cr)_3C+(Cr, Fe)_7C_3→(Cr, Fe)_7C_3. 2) The reduction of complex chromites containing iron oxide (Sp 3 and Sp 4) took place in two stages. In the first stage with the reduction of the FeCr_2O_4 component, FeO and Cr_2O_3 were reduced simultaneously at temperatures higher than 1150℃, although the reduction of FeO preceded at lower temperatures. The reduction of the MgCr_2O_4 component (the second stage) required higher temperatures. It started at 1200℃ and proceeded rapidly at temperatures higher than 1250℃ in the case of Sp 2 and Sp 3. The rapid progress of the reduction of MgCr_2O_4 component of Sp 4 and Sp 5 which contained Al_2O_3 was only encountered at temperatures higher than 1330℃. 3) The metallic product of the chromites Sp 3 and Sp 4 was (Cr, Fe)_7C_3 in either reduction stage of the FeCr_2O_4 and MgCr_2O_4 components. The final product of the reduction of the chromites Sp 2 and Sp 5 was Cr_3C_2, while an unidentified phase appeared during the course of the reduction and was considered to be chromium oxycarbide.
社団法人日本鉄鋼協会の論文
1979-03-01

各種合成クロマイトの炭素還元挙動

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