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-  2018 

Comparison of Isothermal Oxidation Behavior of Co-10Cr-xSi (x=0, 5, 10) Alloys at 1.073.K
Comparison of Isothermal Oxidation Behavior of Co-10Cr-xSi (x=0, 5, 10) Alloys at 1.073.K

DOI: 10.15918/j.jbit1004-0579.18009

Keywords: cobalt-chromium-silicon isothermal oxidation high temperature microstructure
cobalt-chromium-silicon isothermal oxidation high temperature microstructure

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Abstract:

The oxidation behavior of Co-10Cr-xSi (x=0, 5, 10, nominal composition, at%) alloys in 0.1.MPa pure O2 at 1.073.K was investigated. Co-10Cr presents the worst oxidation resistance with the mass gain of about 7.531.mg/cm2 after 24.h oxidation, while Co-10Cr-10Si presents the best oxidation resistance with the much lower mass gain of about 0.078.mg/cm2. Co-10Cr-10Si is about two magnitudes lower than that of Co-10Cr. The oxidation behavior of Co-10Cr-5Si is intermediate between that of Co-10Cr and Co-10Cr-10Si. The nodular oxides have occupied most of the alloy surface, and their microstructure is similar to Co-10Cr, to some extent. On the contrary, only a fraction of the surface is covered by the Cr2O3 layer, whose microstructure is similar to that of Co-10Cr-10Si.
The oxidation behavior of Co-10Cr-xSi (x=0, 5, 10, nominal composition, at%) alloys in 0.1.MPa pure O2 at 1.073.K was investigated. Co-10Cr presents the worst oxidation resistance with the mass gain of about 7.531.mg/cm2 after 24.h oxidation, while Co-10Cr-10Si presents the best oxidation resistance with the much lower mass gain of about 0.078.mg/cm2. Co-10Cr-10Si is about two magnitudes lower than that of Co-10Cr. The oxidation behavior of Co-10Cr-5Si is intermediate between that of Co-10Cr and Co-10Cr-10Si. The nodular oxides have occupied most of the alloy surface, and their microstructure is similar to Co-10Cr, to some extent. On the contrary, only a fraction of the surface is covered by the Cr2O3 layer, whose microstructure is similar to that of Co-10Cr-10Si.

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