氧化铝料浆预浸料结合PIP工艺制备SiC/Al2O3-SiC陶瓷基复合材料及性能研究

连续碳化硅纤维增强碳化硅陶瓷基复合材料（SiC/SiC）具有低密度、耐高温、低氚渗透率和优异的辐照稳定性的优点，在航空、航天、核能等领域具有广泛的应用前景。本文针对PIP工艺制备SiC/SiC复合材料周期长、孔隙率较高及易氧化的问题，通过料浆预浸料工艺在基体中引入氧化铝陶瓷形成SiC/Al2O3-SiC复相基体复合材料，并对复合材料制备工艺过程、微观形貌及力学性能进行系统表征。分析结果表明，SiC/Al2O3-SiC复相基体复合材料制备周期较传统PIP工艺大幅度缩短，且复合材料孔隙率明显降低，从11.6%左右降低至6%，拉伸强度为316.5MPa，提升了12.3%，弯曲强度与SiC/SiC相当，但层间剪切强度较低，仅为16.3MPa，有待进一步提高。

Preparation and Properties of SiC/Al2O3-SiC ceramic matrix composite by Alumina Slurry Prepreg Combined with PIP Process

Continuous silicon carbide fiber reinforced silicon carbide ceramic matrix composite (SiC/SiC) have the advantages of low density, high temperature resistance, low tritium permeability and excellent irradiation stability, and have broad application prospects in aviation, aerospace, nuclear energy and other fields. This article focuses on the problems of long cycle, high porosity, and easy oxidation of SiC/SiC composite materials prepared by PIP process. Aluminum oxide ceramics are introduced into the matrix through slurry pre-impregnation process to form SiC/Al2O3-SiC composite matrix composite materials. The preparation process, microstructure, and mechanical properties of the composite materials are systematically characterized. The analysis results show that the preparation period of SiC/Al2O3-SiC composite is significantly shorter than that of the traditional PIP process, and the porosity of the composite is significantly reduced from about 11.6% to 6%, the tensile strength is 316.5MPa, increased by 12.3%, and the bending strength is equivalent to that of SiC/SiC, but the interlaminar shear strength is lower, only 16.3MPa, which needs to be further improved.