Abstract
Crack healing of Nb and Al alloyed MoSi2 notched ceramics had been investigated during thermal treatment from 900 to 1500°C in air, vacuum, argon and nitrogen environments. Notched (Mo0.97Nb0.03)(Si0.97Al0.03)2 ceramics showed significant recovery of bending strength after heat treatment in air. Bending strength recovery of 250% was found after heat treatment in air at 1200°C. Oxide layer formation healed the cracks during annealing in air. Re-sintering was found dominant mechanism of crack healing during annealing in vacuum, argon and nitrogen atmosphere. Bending strength recovery of 208% was found after heat treatment in vacuum at 1200°C.
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