以短切碳纤维为增强体，采用温压-熔渗工艺(WP-LSI)制备纤维体积分数分别为20%、25%和30%的C/C-SiC复合材料，研究纤维含量对C/C-SiC复合材料力学性能的影响，并与国外同类产品进行对比。结果表明：随碳纤维含量增加，复合材料的开孔率降低，抗弯强度和抗压强度均提高，纤维体积分数为30%的复合材料密度达2.00 g/cm3，开孔率仅2.88%，其抗弯和垂直抗压强度分别为104.63 MPa和167.99 MPa，比纤维体积分数为20%的材料分别提高86.04%和44.76%，比国外同类产品分别提高2.03%和11.99%；随碳纤维含量增加，复合材料的破坏形式由假塑性破坏向脆性破坏转变。%C/C-SiC composite strengthened with short carbon fiber of volume fraction of 20%, 25% and 30%respectively were prepared by Warm Compressing-Liquid Silicon Infiltration (WC-LSI). The effect of fiber content on the mechanical properties of C/C-SiC was studied and compared with similar product on the market. The results show that, with increasing the carbon fiber content from 20% to 30%, the open porosity decreases, flexure strength and compressive strength of the composite increase. The density and open porosity of the C/C-SiC composite with carbon fiber content of 30%are 2.00 g/cm3 and 2.88%, respectively, the bending and vertical compressive strength are 104.63 MPa and 167.99 MPa, which are 86.04% and 44.76% higher than that of the C/C-SiC composite with carbon fiber of 20%, and are 2.03% and 11.99% higher than that of foreign sample. The failure process changes from pseudo plastic destruction to brittle failure with increasing carbon fiber content.
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