118 ムライト/炭化ケイ素マルチ複合材の応力下におけるき裂治癒挙動と治癒材の疲労強度特性(知的材料・構造システム)

概要

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Mullite/SiC whiskers/ SiC particles multi-composite, having excellent crack-healing ability and mechanical properties, was hot-pressed in order to investigate the crack-healing behavior under stress and resultant fatigue strength at the temperature of healing. To actualize ceramic components made of the multi-composite, it is necessary to know threshold stress for crack-healing. A semi-elliptical surface crack of 100μm in surface length was made on each specimen. The pre-cracked specimens were crack-healed under cyclic or constant stress by using three-point bending stress at 1200℃, and the resultant bending strength and cyclic fatigue strength were investigated at 1200℃. The pre-crack on the surface of specimens could be healed even under stress. The threshold stresses for crack-healing, determined by evaluating strengths of crack-healed specimens at healing temperature of 1200℃, were found to be 170MPa for both constant and cyclic stresses, corresponding to 80% of bending strength of the pre-cracked specimens. The static and cyclic fatigue strengths of crack-healed specimens were also investigated at healing temperatures of 1200℃.
一般社団法人日本機械学会の論文
2006-11-25