Mechanical behavior of BN-coated Hi-Nicalon SiC fiber-SiC matrix composite at room and high temperatures

摘要

Tensile mechanical properties of PIP-processed 2D, plain-woven fabric, BN-coated Hi-Nicalon SIC fiber-reinforced SiC matrix composite at room temperature (298K), 1400 and 1600 K in air have been studied. Young's modulus and tensile strength of the composite decrease with the increase of test temperature, especially at 1600 K a considerable reduction is observed. The tensile strength is found to be consistent with the value predicted by a global load sharing model, based on the actual in situ fiber strength properties which are obtained by a fracture mirror method.