Abstract
A study has been carried out on non-isothermal and cyclic oxidation behavior of the W1−x Cr x –3 wt pct Y2O3 (x = 0.3 or 0.5) composite samples, and the results have been compared with those of binary W-Cr alloys. The microstructures of the sintered samples showed the presence of W-rich (β1) + Cr-rich (β2) regions and more or less uniformly distributed Y2O3 particles. Protection against high-temperature oxidation is possible due to the formation of a stable mixed oxide scale containing both Cr2WO6 and Y2W3O12 at the oxide–air interface. Melting of the eutectic composition of Y2W3O12 and WO3 leads to the formation of a liquid phase, which helps in closure of pores by sintering and viscoplastic flow of the oxide scale, thereby enhancing its resistance to spallation and further oxidation.
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