Effects of high temperature pretreatments on high temperature fracture behavior of SiC-C/SiC

The samples made from a SiC-C/SiC composite were pretreated in Ar under creep, fatigue, creep and fatigue interaction, as well as in dry oxygen and wet oxygen under fatigue at 1300°C for 15 hours. The fracture behaviors of the pretreated samples were investigated at 1300°C. The loading-strain curves and the micro structures of the sample were compared with each other. The various of high temperature tensile behaviors was attributed to the different microstructures resulted from different high temperature pretreatments.