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.
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