Light CB/PUR honeycomb sandwich composites with excellent absorbing properties were prepared.CB/PUR paste was formed by dispersing conductive carbon black into waterborne polyurethane resin.Light CB/PUR honeycomb sandwich composite absorbing material was prepared by impregnation method.Scanning electron microscope (SEM) was used to characterize the microstructure of the absorbing material,and the effects of weight gain and the number of layers of the composite on the absorbing property were studied.The microstructural analysis showed that CB/PUR impregnated layer was closely bound to the honeycomb wall,and the impregnated layer thickness of the absorbing material under10%,20% and 30% weight increase was 20～30μm,40～45μm,50～60μm,respectively.The absorbing material was successfully composite.The results of microwave reflectivity test shown that the absorbing material had no obvious absorbing ability when the weight was 30%,but the absorbing material coating had excellent microwave absorbing performance when the weight was 10% and 20%,and when the structure was double layer.When the weight was 20% and the double-layer structure was built,the coating shown the best absorbing performance,with the maximum absorbing strength of -16dB and effective absorbing bandwidth of 18GHz,which covered the whole measurement frequency band,and shown excellent broadband absorbing performance.In addition,when the weight was increased by 10%,the double layer structure also realized the radar wave measurement frequency band of 13GHz absorption.
Zhao Yankai, Bi Song, Hou Genliang, Liu Zhaohui, Li Hao, Song Yongzhi
. Preparation and microwave absorption property of lightweight honeycomb sandwich composite[J]. New Chemical Materials, 2021
, 49(5)
: 93
-96
.
DOI: 10.19817/j.cnki.issn 1006-3536.2021.05.021
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