938 SiC/SiC 複合材料の引張強さと引抜け長さの評価

概要

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SiC matrix composites reinforced with C-coated and BN-coated continuous SiC fibers were fabricated by PIP method to increase toughness of SiC monolithic materials; their tensile strengths of room temperature and fracture manner were explored. While a SiC matrix composite reinforced with uncoated SiC fibers was fractured in a brittle manner, both the coated fiber composites were fractured with fiber pull-out, because the coating layers bring interfacial debonding and sliding between the fibers and matrix. Since the interfacial sliding prevents the composite from transverse crack propagation, the tensile strength of the coated fiber composites becomes higher than that of the uncoated fiber composite. The present study further clarifies the effect of fiber coating on the fatigue life in tension of SiC matrix composites.
2003-08-05