In Situ Crack-Healing Behavior of Mullite/SiC Composite Ceramics

Crack-healing behaviour of mullite/SiC/Y2O3 composites and its application to the structural integrity of machined components

“…However, a large self-crack-healing ability was successfully induced similar to that of Al 2 O 3 /SiC [5][6][7][8][9][10] and Si 3 N 4 /SiC [11][12][13][14][15][16] by adding 15-20 mass% nano-size SiC particles. [1][2][3][4] Especially, the mullite/SiC composite exhibits very interesting in situ crack-healing ability at 1273-1473 K. [17][18][19] In other words, the mullite/SiC can heal a crack even under 5 Hz cyclic stress and exhibit the same fatigue limit as the base material at the healing temperature. As to objective (3), the basic crack-healing behaviour of an indented crack was studied systematically in terms of the functions of crack-healing temperature and time, the crack-healing mechanism, and the resultant strength behaviour of the crack-healed components at elevated temperatures.…”

“…As to objective (3), the basic crack-healing behaviour of an indented crack was studied systematically in terms of the functions of crack-healing temperature and time, the crack-healing mechanism, and the resultant strength behaviour of the crack-healed components at elevated temperatures. [1][2][3][4][17][18][19] However, the strength recovery behaviour of machined component have not yet been studied. 20 Applying the high crack-healing ability of ceramics to structural components for engineering use could result in great benefits, such as the increased reliability of the structural ceramic components and reduced inspection, machining, and polishing costs for the ceramic components.…”

Effect of Difference in Crack-healing Ability on Fatigue Behavior of Alumina/Silicon Carbide Composites

“…Alumina Ando et al, 2004;Nakao et al, 2005), mullite (Furusawa et al, 2003;Ono et al, 2005) and silicon nitride containing silicon carbide have great self crack-healing ability. In the previous investigations, it was found that the crack healing caused the great effect to their monotonic strength.…”