采用无压浸渗法制备了SiCP/Al复合材料,自氧化法处理的预制型的抗压强度大幅提高,同时降低了该复合材料的残余孔隙率;基体合金中的Mg含量对复合材料的残余孔隙率有较大影响,进而影响了其抗压强度。实验结果表明,采用不同粒径的SiC颗粒配比及自氧化法处理的孔隙率为40%的SiC预制型,无压浸渗Al-11wt%Si-6wt%Mg所制备的SiCP/Al复合材料的抗压强度为367 MPa、热膨胀系数为9.2×10-6/℃。 The SiCP / Al composites were prepared by pressureless infiltration method. The pre-form compressive strength of the composites increased greatly and the residual porosity of the composites decreased. The residual Mg content in the matrix alloy Porosity has a greater impact, thereby affecting its compressive strength. The experimental results show that the SiCP / Al composites prepared by pre-infiltration of Al-11wt% Si-6wt% Mg without pretreatment with 40% porosity of SiC particles with different particle sizes and self-oxidation process The compressive strength of 367 MPa, thermal expansion coefficient of 9.2 × 10-6 / ℃.