纳米铁纤维与羰基铁粉共混制备轻质宽带吸波涂层材料

为降低羰基铁粉吸波剂的密度、提高介电常数,采用轻质、高介电常数的纳米铁纤维与羰基铁粉共混,制备了轻质宽带吸波涂层.研究了纳米铁纤维含量对复合吸波剂微波电磁与吸收特性的影响.结果表明,随纳米铁纤维含量的提高,复合吸波剂的介电常数和磁导率增大.当复合吸波剂中纳米铁纤维含量(质量分数)为2.2%-4.4%时,吸波涂层有更低的面密度和更宽的有效带宽,这是由于在一定范围内提高介电常数,可以改善吸波涂层的匹配吸收特性.

PREPARATION OF LIGHT RADAR ABSORBING MATERIALS WITH BROAD BANDWIDTH BY MIXING IRON NANOFIBERS WITH CARBONYL IRON PARTICLES

In view of the high density and low permittivity of the carbonyl iron particles, the light absorbing coatings with broad bandwidth were fabricated by decreasing the mass fraction of carbonyl iron particles and mixing the iron nanofibers with low density and high permittivity into the absorbent. The influences of the mass fraction of the iron nanofibers on the microwave electromagnetic and absorbing properties of the iron nanofibers/carbonyl iron particles composites were investigated. The results showed that the complex permittivity and permeability of the composites increased with the increase of the mass fraction of the iron nanofibers. The absorbing coatings based on the composites consisting of 2.2-4.4 wt% iron nanofibers exhibited a broader bandwidth and lower surface density than that of the absorbing coatings based on carbonyl iron particles, which was attributed to the enhancing of the matching and absorbing properties of the absorbing coatings through the increase of the complex permittivity of the absorbent in an appropriate range. Thereforre, a new method was provided for the preparation of the light absorbing absorbing coatings with broad bandwidth.