Abstract
A self-passivating W-Si-Y alloy was prepared by spark plasma sintering, while the microstructure evolution and oxidation mechanism at 1000 °C were analyzed. The alloy exhibits excellent oxidation resistance due to the introduction of Y. At high temperatures, Y enriches on the surface of the oxide scale, and a melt mainly containing W, Y and O is formed. The melt can close the pores on the surface of loose oxide layer to form a dense protective layer, which not only prevents oxygen from permeating into the alloy, but also alleviates the sublimation of WO3.
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