通过多次重复先驱体浸渍裂解（PIP）工艺过程，改变材料的孔隙率和体密度，制备不同孔隙率的三维针刺碳／碳（C／C）复合材料，并研究了在8．2-12．4GHz频率范围内（x波段）不同孔隙率C／C复合材料的电磁屏蔽效能。结果表明：适当降低孔隙率有利于提高C／C复合材料的总电磁屏蔽效能和电磁吸收屏蔽效能，当开气孔率为33．4％时，C／C复合材料具有最大的电磁屏蔽效能（40dB），且电磁吸收屏蔽效能（30dB）远大于电磁反射屏蔽效能（12dB），是极具潜力的高吸收低反射电磁屏蔽材料。
3D carbon/carbon （C/C） composite materials with different porosities and bulk densities were fabricated by repeated precursor infiltration and pyrolysis （PIP） process, and the electromagnetic interference shielding （EMI） effectiveness of C/C composites at 8.2 - 12.4 GHz （X band） with different porosities were studied. The results indicate that both EMI absorption shielding effectiveness and the total EMI shielding effectiveness of C/C composites could be improved by reducing the porosity appropriately. When the open porosity is 33.4~, the C/C composite material shows a maximum shielding effectiveness of 40 dB, and the EIM apsorption shielding effectiveness（30 dB） is much higher than EMI reflection shielding effectiveness（12 dB））. Porous C/C composite is one kind of excellent EMI shielding materials with high absorption and low reflection.
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