High‐temperature fatigue crack propagation mechanism of orthogonal 3‐D woven amorphous SiC Fiber/SiC/YSi₂‐Si matrix composites

To elucidate degradation mechanisms attributable to high‐temperature fatigue crack propagation, a study was conducted of 3‐D woven SiC f /SiC CMC in which amorphous SiC fiber was used as a reinforcement material and in which a matrix was formed through low‐temperature melt infiltration. From a high‐temperature fatigue test conducted at 1373 K in the atmosphere with stress of 142 MPa or more, the fracture lifetime of newly developed SiC f /SiC...