以短切预氧丝和酚醛树脂为原料，采用真空抽滤成型、固化、碳化等系列工艺制备了低密度碳／碳复合材料；通过扫描电镜和材料试验机研究了复合材料的组织与性能。结果表明：复合材料具有明显的各向异性；当纤维的质量分数由95％降低至58％时，复合材料的孔隙率逐渐减小，其密度由0．11g·cm^-3增加至0．22g·cm^-3，抗压强度由0．18MPa逐渐增大到1．09MPa，并且其压缩断裂机制也随之发生变化。
Taking chopped PAN-based oxidized fiber and phenolic resin as raw materials, the low-density carbon-carbon composites were prepared by vacuum moulding technique, solidification, and carbonization process, and the microstructure and properties of the composites were studied by scanning electron microscopy and material testing. The result show that the composite had obvious anisotropy. The open porosity of the composite gradually decreased, while the density increased from 0. 11 g. cm^-3 to 0. 22 g .cm^-3 , and the compressive strength raised from 0. 18 MPa to 1.09 MPa with the decrease of the fiber content from 95wt% to 58wt%, and the mechanism of compression fracture also Changed.
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