ムライトき裂治癒材の疲労強度特性に及ぼす初期き裂寸法と試験温度の影響

概要

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Mullite/SiC composite ceramics was sintered and subjected to three-point bending on specimens made according to the appropriate JIS standard. Semi-elliptical surface crack of 100,200μm in diameter was made on each specimen. By using three kind of specimens (smooth, cracked and crack healed), crack-healing behavior and cyclic fatigue strengths were determined systematically at room temperature. And static fatigue strengths was determined systematically at room temperature, 700℃ and 1000℃. The main conclusions obtained are following : (a) Mullite/SiC composite ceramics has ability to heal a crack. (b) Crack healed specimen showed higher cyclic and static fatigue strength than as-received specimen, and this fact was caused by crack healing. (c) Crack healed part has enough fatigue strength and most fracture occurred outside the crack-healed zone in crack-healed specimen. (d) Crack-healed specimen has a sufficient strength for cyclic fatigue and static fatigue at room temperature. (e) The static fatigue strength of crack-healed samples at 700℃ and 1000℃ were similar to the values at room temperature.
2001-08-15