K-0904 窒化ケイ素/SiC複合セラミックスのき裂治癒温度(1000℃)での強度特性(G04-1 材料試験・特性評価)(G04 機械材料・材料加工部門一般講演)

概要

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Si_3N_4/SiC composite ceramics were sintered and subjected to three-point bending. A semi-circular surface crack of 100 μm in diameter was made on each specimen. We systematically studied crack-healing behavior, cyclic and static fatigue strengths at 1000℃ by using three kinds of specimens (smooth, cracked and crack-healed). The main conclusions are as follows. Si_3N_4/SiC composite ceramics could heal a crack even under constant or cyclic stress at 1000℃ completely. The fatigue limit at 1000℃ depended on the healing process. The sample crack-healed at 1000℃ had sufficient static and cyclic fatigue strengths at 1000℃. New crack healing process have been proposed.
社団法人日本機械学会の論文
2001-08-22