サイアロン焼結体の酸化特性に及ぼす混入ステアタイトの影響

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The oxidation resistance of hot-pressed sialon prepared from siliceous sand and Al were studied in flowing dry air between 1300° to 1500°C for 20h. The reactions were followed by thermogravimetric apparatus, X-ray diffraction and scanning electron microscopy. The materials used for oxidation tests were A: hot-pressed sialon, B: hot-pressed sialon contaminated with 1wt% of steatite, C: hot-pressed sialon contaminated with 5wt% of steatite.The contamination of steatite at pulverizing stage decreased the oxidation resistance of sialon by about an order of magnitude as compared to sialons without contamination.The oxide layer of specimen A at 1300°C consisted of mainly mullite, and a small amount of glass phase appeared in oxide layer in addition to mullite at 1500°C. Mullite, cordierite and glass phase were observed at 1300°C in the oxide layer of specimens B and C, with increasing oxidation temperature, cordierite in oxide layer melted and only mullite as crystalline phase were observed in glass phase with many pores at 1500°C.The oxidation rate of specimens A, B and C followed classical parabolic rate law. Much faster parabolic rate were observed above about 1450°C for specimen B and less fast parabolic rate were observed above about 1425°C for specimen C.These considered to be due to the formation of liquid with low viscosity by melting of cordierite in oxide layers to increase oxygen penetration through oxide scale for the former, and in addition to oxidation reaction, some reactions accompanied with weight loss seemed to be involved for the latter.
社団法人日本セラミックス協会の論文
1979-12-01

サイアロン焼結体の酸化特性に及ぼす混入ステアタイトの影響

スポンサーリンク

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スポンサーリンク