ALON基複合セラミックスの高温中の機械的性質(第1報) : ALON-BN複合セラミックスの酸化が機械的性質に及ぼす影響

概要

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The relationship between mechanical properties and oxidation of ALON-based composite ceramics at high temperature was investigated. The flexural strength of ALON-based composite ceramics at 600-800℃ decreased by 10-30% compared to the strength measured at room temperature. The flexural strength at 1000℃ was about one half of the room temperature strength; however, the strength at>1000℃ increased again. Investigation based on X-ray diffractometry (XRD) and thermogravimetry-differential thermal analysis (TG-DTA) clarified that in the ALON-based composite ceramics, formation of γ´-ALON and B_2O_3 by oxidation of γ-ALON, BN phases in the ceramics occurred by heating up to 800℃ in air, then at 1000℃ α-Al_2O_3 formed from γ´-ALON and finally 9Al_2O_3・2B_2O_3 formed on the surface of the ceramics containing BN contents higher than 10 vol%. Decreasing of flexural strength at elevated temperature was caused by oxidation of γ-ALON and BN phases.
社団法人日本セラミックス協会の論文
2001-02-01