1015 Al_2O_3/SiC複合セラミックスのき裂治癒挙動と治癒材の強度特性(オーガナイズドセッション : 表面改質材の機械的安全性保証)

概要

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Al_2O_3/SiC composite ceramics was sintered by hot pressing. Three point bend tests were conducted according to JIS standard. Semi-elliptical surface crack of 40-350μm in diameter was made on the specimen. Four kinds of specimens (as-received, heal treated, pre-cracked and heal treated cracked), crack healing behavior and high temperature strength were tested systematically. The main conclusions were obtained as follows: (a) Al_2O_3/SiC composite ceramic has ability to heal crack. (b) Pre-cracked Al_2O_3/SiC composite ceramic to be healed completely at 1000℃, 1200℃ and 1300℃, for 300h, 10h and 1h, in air each other. (c) The maximum crack size to be healed is semi-elliptical crack of about 300 μm in diameter. (d) Crack healed part has approximately the same strength of smooth specimen up to 1100℃ and most specimen failed outside the pre-cracked zone.
社団法人日本機械学会の論文
2001-09-20