对PIP法制备2D-SiC_f/SiC复合材料成形浆料中惰性填料SiC含量对2D-SiC_f/SiC复合材料孔隙率、纤维体积分数以及力学性能影响进行研究.研究表明,SiC微粉含量较低时,浆料粘度过低,导致层间存在较大气孔,纤维体积分数不高,致使复合材料力学性能不佳,当SiC微粉含量过高时,浆料粘度过大,层间基体厚度增加,纤维体积分数下降,并且浸渍效率降低,孔隙率增大,复合材料力学性能下降.当SiC微粉含量为33.3%时,复合材料具有较低的孔隙率和较高的纤维体积分数,复合材料具有较好的力学性能,弯曲强度和断裂韧性分别达到211.7 MPa和8.56 MPa·m~(1/2).
The 2D-SiC_f/SiC composites were fabricated by the PIP process. The effects of the SiC powder contents in the molding slurry on the porosity, fiber volume fraction and the mechanical properties of the SiC_f/SiC composites were investigated. The results show that the lower content of the SiC powder will lead to the low slurry viscosity, and the high porosity and low fiber volume fraction in composites, which is disadvantage to the mechanical properties of the SiC_f/SiC composites. Contrariy, the higher content of the SiC powder will lead to high slurry viscosity and thick matrix layer, which will result in the low fiber volume fraction. At the same time, the higher content of the SiC powder also will lead to the low infiltration efficiency, and the high porosity and low mechanical properties of the SiC_f/SiC composites. Better mechanical properties can be gained when the SiC powder content is 33.3%, and the flexural strength and fracture toughness can reach 211.7 MPa and 8.56 MPa·m~(1/2), respectively.
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