Abstract
BN coated Hi-Nicalon SiC fiber reinforced SiC matrix composites were evaluated under thermal cycling conditions. A surface of the specimen was heated by burner furnace and cooled by atmospheric air. The other side surface was cooled by applying pressured cooling air to deliver the air through the composites. The residual bending strength after the tests were measured and compared to the strength of untreated samples. The effect of cooling air flow rate on the residual bending strength was also investigated. It was showed that the bending strength was decreased by 13% after 500 thermal cycles and that the effect of the pressured cooling air on the strength was not recognized.
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