Processing and Mechanical Properties of Fiber-Reinforced Oxide Matrix Composites with High Damage Tolerance

抄録

Processing and mechanical properties of dense and porous composites were studied with the nonoxide fiber/oxide matrix system and the oxide fiber/oxide matrix system. Preparation of dense composites needs a high processing temperature (1500°-1700°C), resulting in degradation of fibers, formation of large residual stresses during cooling process and low pseudoductility. On the other hand, porous composites processed at a low temperature (500°-1100°C) provide a high strength and great damage tolerance, which are associated with significant delamination of layered fabric or fiber pullout. The chemical affinity and difference in the thermal expansion coefficients and Young's moduli between fiber and oxide matrix in the composite play important role on the mechanical properties.