Abstract
Three Stellite alloys with different Si contents (CCW, CCW-3Si and CCW-5Si) were prepared via spark plasma sintering. Their oxidation behavior at 800 °C was studied. After 200 h oxidation, oxide scale grown on the alloys CCW and CCW-3Si is mainly composed of Cr2O3 and CoCr2O4. While for the alloy CCW-5Si, SiO2 formed at the alloy/scale interface, which inhibited effectively the outward diffusion of Co and ensured the formation of a pure and dense external Cr2O3 scale. Its oxidation resistance is significantly improved, and the parabolic rate constant accounts for less than one fifth of that of CCW.
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