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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。
The three-dimensional acupuncture carbon / carbon (C / C) composites with different porosity were prepared by repeating the PIP process and changing the porosity and bulk density of the materials. Electromagnetic shielding effectiveness of C / C composites with different porosity in the frequency range (X band). The results show that proper reduction of porosity can improve the total electromagnetic shielding effectiveness and electromagnetic shielding effectiveness of C / C composites. C / C composites have the maximum electromagnetic shielding effectiveness (40dB) when the porosity is 33.4% And the electromagnetic absorption shielding effectiveness (30dB) is much larger than the electromagnetic reflection shielding effectiveness (12dB), which is a potential high absorption and low reflection electromagnetic shielding material.