SiCNW-Cf/LAS复合材料的制备和电磁波吸收性能EI北大核心CSCD

采用热蒸发法,以乙炔黑为碳源,在碳纤维(Cf)布上制备不同摩尔硅碳比的SiC纳米线(SiCNW)。通过浆料浸渍及真空烧结工艺,以不同摩尔硅碳比下制备的SiCNW-Cf作为中间夹层制备SiCNW-Cf/LAS(Li2O-Al2O3-SiO2)复合材料。结果表明:随着摩尔硅碳比的减小,SiCNW的直径不断减小,产量先增加后减小,并在摩尔硅碳比为1∶3时达到最高。摩尔硅碳比为1∶1时,所制备的SiCNW-Cf/LAS具有对电磁波的最低反射损耗-40.9dB(7GHz,3mm)。摩尔硅碳比为1∶3时,所制备的SiCNW-Cf/LAS具有吸收电磁波的最大有效带宽4.61GHz(Ku波段,1.5mm)。SiCNW-Cf/LAS复合材料优异的吸波性能归因于其对电磁波较高的介电损耗、散射损耗以及LAS对材料与空间阻抗匹配的调整。

Preparation and electromagnetic wave absorptionproperties of SiCNW-Cf/LAS composites

SiC NW were prepared with different molar ratio of silicon to carbon on carbon fiber cloth by thermal evaporation method using acetylene black as carbon source.SiC NW-Cf/LAS(Li2O-Al 2O3-SiO2)were prepared by using slurry-impregnation and vacuum sintering process with SiC NW-C f as intermediate interlayer.The results show that as the molar ratio of silicon to carbon decreasing,the diameter of SiCNW decreases continuously,and the yield first increases and then decreases and reaches the highest when the molar ratio of silicon to carbon is 1∶3.The SiC NW-Cf/LAS prepared with a molar ratio of silicon to carbon of 1∶1 has a minimum reflection loss of-40.9 dB(7 GHz,3 mm)for electromagnetic wave.The SiC NW-Cf/LAS prepared at a molar ratio of silicon to carbon of 1∶3 has a maximum effective bandwidth for absorbing electromagnetic wave of 4.61 GHz(Ku band,1.5 mm).The excellent absorbing properties of SiC NW-Cf/LAS composites can be attributed to their higher dielectric loss and scattering loss for electromagnetic wave and adjustment of LAS to material and space impedance matching.