文摘
Three-dimensional braided carbon fiber-reinforced ZrC matrix composites, 3-D C/ZrC, were fabricated by reactive melt infiltration process at 1200 掳C. Phenolic resin and asphalt were used as carbon precursors, and the effects of carbon matrix on microstructure and properties of the 3-D C/ZrC composites were investigated. The composites fabricated with asphalt showed a higher ZrC yield of 37.5卤1.0 vol% and better anti-ablative properties, with a mass loss rate of 0.8卤0.3 mg s鈭? and a linear recession rate of 0.0006卤0.0002 mm s鈭?. However, the use of phenolic resin could provide better mechanical properties of the obtained composites, including a flexural strength of 285.4卤9.7 MPa, an elastic modulus of 76.2卤4.0 GPa and a fracture toughness of 8.9卤0.8 MPa m1/2. The main reason for the superior mechanical properties is the preservation of carbon fiber bundles in the phenolic resin based composites.