分别采用先驱体裂解-热压和先驱体浸渍-裂解方法制备出了SiCf/SiC复合材料. 重点探讨了不同制备工艺对复合材料纤维/基体间界面和断裂行为的影响.研究表明,采用先驱体裂解-热压工艺制备复合材料时,虽然烧结液相可以促进复合材料的致密化,但其同时导致纤维与基体间的界面结合强以及纤维本身性能的退化,因此复合材料表现为脆性断裂, 具有较低的力学性能.而采用先驱体浸渍-裂解法制备复合材料时,由于致密化温度较低,复合材料中纤维与基体的界面结合较弱,而且纤维的性能保留率较高,因此,纤维能够较好地发挥补强增韧作用,复合材料具有较好的力学性能,其抗弯强度和断裂韧性分别为703.6MPa和23.1Pa·m1/2.
Silicon carbon fiber-reinforced SiC composites were prepared by precursor pyrolysis-hot
pressing (PP-HP) and precursor impregnation-pyrolysis (PIP), respectively. The effect of fabrication methods on the microstructure and mechanical
properties of the composites was investigated. It was found that the composites prepared by PP-HP exhibited brittle fracture behaviors though
they were well densified, which was mainly ascribed to a strongly bonded fiber/matrix interface and the degradation of the fibers caused by higher
processing temperature. On the contrary, the composite prepared by PIP showed tough fracture behaviors, which could be rationalized on the basis
of a weakly bonded fiber/matrix interface as well as higher strength retention of the fibers. As a result, in comparison with the composites prepared by
PP-HP, the composites prepared by PIP achieve better mechanical properties with a flexural strength of 703.6MPa and fracture toughness of 23.1Pa·m1/2.
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