Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10140065 | Progress in Organic Coatings | 2018 | 10 Pages |
Abstract
Waterborne polyurethane matrix coatings using the carbonyl iron particles (CIP) and graphene sheets (GNs) as electromagnetic wave absorbing fillers were fabricated. The electromagnetic parameters of CIP and GNs were measured in 2-18âGHz by transmission/reflection technology. The reflection loss (RL) of the coatings was measured by the arch method. The electromagnetic loss mechanisms and the effect of GNs addition on absorption properties and of composites were discussed. And the morphology of fillers and the micrographs of coatings fracture surface were observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results showed that, the unique electromagnetic properties of GNs can make up the shortage of CIP, and the synergistic effects of dielectric/magnetic composites can improve the electromagnetic wave attenuation. In addition, the electromagnetic wave absorption properties can be adjusted by simply changing the content of GNs and CIP particles to obtain the broadband microwave absorption coatings with small thickness. When the mass ratio is CIP:PU:GNsâ=â2.5:1:0.01, reflection loss values exceeding -10âdB can be obtained in the frequency range of 10.9â18âGHz with a thickness of 1âmm. The models of equivalent circuit and synergistic effect among CIP/GNs/PU composite coating were built to analyze the improvement mechanisms of absorption properties.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Process Chemistry and Technology
Authors
Yuping Duan, Yi Liu, Yulong Cui, Guojia Ma, Wang Tongmin,