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Crack‐Healing Behavior Under Stress of Mullite/Silicon Carbide Ceramics and the Resultant Fatigue Strength
Author(s) -
Ando Kotoji,
Furusawa Kotokaze,
Chu Min Cheol,
Hanagata Tsuyoshi,
Tuji Kiichi,
Sato Shigemi
Publication year - 2001
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2001.tb00960.x
Subject(s) - mullite , materials science , composite material , silicon carbide , ceramic , crack closure , cracking , composite number , flexural strength , fracture mechanics
Mullite/SiC composite ceramics were sintered and subjected to three‐point bending of specimens made according to the appropriate JIS standard. A semicircular surface crack 100 to 250 μm in diameter was made on each specimen. We systematically studied crack‐healing behavior and cyclic‐ and static‐fatigue strengths at room temperature and 1000°C (crack‐healing temperature) by using three types of specimens (smooth, cracked, and crack‐healed). The main conclusions are as follows: (i) mullite/SiC composite ceramics have the ability to heal after cracking; (ii) crack‐healed specimens exhibited higher static and fatigue strengths than those of smooth specimens, which was caused by crack‐healing; (iii) a sample crack‐healed at 1000°C had a high fatigue strength at 1000°C; and (iv) mullite/SiC ceramics can heal a crack under stress at 1000°C, and this behavior was considered using crack‐driving force and crack‐healing force, qualitatively.