羰基铁粉/炭黑复合涂层吸波性能的研究

o prevent serious electromagnetic interference, a single-layer wave-absorbing coating employing complex absorbent composed of carbonyl-iron powder (CIP) and carbon black (CB) with epoxy resin as matrix was prepared. The patterns of CIP and CB were characterized by scanning electron microscope (SEM) and transmission electron microscope (TEM), respectively. The electromagnetic parameters of CIP and CB were measured in the frequency range of 2-18GHz by transmission/reflection method, and the electromagnetic loss mechanisms of the two particles were discussed, respectively. The microwave absorption properties of the coatings were investigated by measuring reflection loss (RL) using arch method. The effects of CIP ratio, CB content and thickness on the microwave absorption properties were discussed, respectively. The results showed that the higher thickness, CIP or CB content could make the frequency of absorption peak shift towards the lower frequency range. For the sample with CIP content (25 wt%), CB ratio (25wt%) and thickness of 1.5mm, the absorption bandwidth (RL<-4dB) achieved 10.1GHz (7.9-18GHz).