Abstract
In order to investigate the strength reliability and durability of ceramic parts under gas turbine environments, the effect of oxide layer on the damage behavior caused by a particle impact in silicon carbide (SiC), which was oxidized at 1673K or at 1523K for 200 hours in the atmosphere, was examined. The long-term oxidation produced a slight increase in the static fracture strength of SiC. Particle impact caused a spalling of the oxide layer and some cracks in the substrate. The spalling patterns and the extent of the damage induced were dependent upon both the property and the velocity of the particle. An explanation of the spalling behavior based on the mechanism of lateral crack formation in ceramic materials could be shown. In the low velocity region, the oxidized SiC showed a slight increase in residual strength after particle impact, as compared with the as-received SiC.
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