Effect of Crack Healing of SiC according to Times of SiO2 Colloid Coating

الملخص EN

Crack healing behavior of SiC ceramics with large crack width has been studied as a function of coating and heat treatment.

The SiO2 colloid coating was carried out on two types: hydrostatic pressure coating and roll coating.

The crack healing was one hour at 1173 K in air.

The crack part formed SiO2 oxides until the critical times by a hydrostatic pressure method.

The crack does not anymore heal if it exceeds the critical times.

The crack part and the base part have many O components and Si components regardless of the times of coating and heat treatment.

The combined hydrostatic and rolling coating method did not have nearly an effect on crack-healing for large crack width over 1.4 μm.

The study for more effective healing of a large crack width must be carried out in the future.