Effects of Cr-addition and lamellar microstructure on the oxidation behavior of single crystal (Mo0.85Nb0.15)Si2
Journal of Alloys and Compounds(2011)
Abstract
The oxidation behavior of (Mo 0.85 Nb 0.15 )Si 2 single crystals and the influence of Cr-addition were studied focusing on its microstructure dependence. Cr-addition to single-phase C40-structured (Mo 0.85 Nb 0.15 )Si 2 crystal induced the formation of crystalline silica, leading to slightly larger weight gain during the oxidation test at 1200 °C. Furthermore, Cr-addition to C40/C11 b duplex-phase (Mo 0.85 Nb 0.15 )Si 2 crystal with lamellar structure strongly suppressed the internal oxidation of the C11 b phase, resulting in excellent oxidation resistance. C40/C11 b lamellae-structured crystals showed better oxidation resistance than the C40-structured crystals.
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Key words
Transition metal alloys and compounds,Oxidation,Microstructure
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