Oxidation Resistance of Co-10Cr-5Si-0.3Y Alloys at 800°C

Peng Li; Jun Huai Xiang; Hong Hua Zhang; Yang Zhang; Jian Rong Zhu

doi:10.4028/www.scientific.net/AMR.391-392.615

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 391-392Oxidation Resistance of Co-10Cr-5Si-0.3Y Alloys at...

Oxidation Resistance of Co-10Cr-5Si-0.3Y Alloys at 800°C

Abstract:

The effect of the addition of 0.3 at.% Y on high temperature oxidation resistance of ternary Co-10Cr-5Si alloy in 0.1MPa O2 at 800°C was investigated. The addition of 0.3 at.% Y greatly increased the oxidation rate of the alloy and changed the approximate parabolic rate law into linear rate law. The scale formed on Co-10Cr-5Si-0.3Y alloy was double-layered, with formation of an outer layer of CoO and an inner region containing a mixture of CoO, Cr₂O₃, SiO₂ and a trace of yttric oxide, coupled to the internal oxidation region of Si.