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The short-term (<86,400s) oxidation behavior of sintered Si3N4 materials with Y203, Y2O3-Al3O3, and Y2O3-Al2O3-TiO2 as sintering aids was studied at 1673K in Ar/O2 gas mixtures. The oxidation followed... parabolic behavior and the parabolic rate constant increased with the content of sintering aids. Yttrialite formed over shorter-term (<21,600s) for oxidation in specimens having high oxidation resistance. The larger prismatic and elongated crystals of Y2O3-2SiO2 were observed in the oxidation layers of specimens having the comparative poor resistance. The data suggests that the outward diffusion of Y3+ from glassy grain boundary appears to be oxidation rate-controlling and that the diffusion is concerned with liquid-forming caused by the concentration of Y3+ and the other cations.続きを見る
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Mendeley出力
