Abstract
BaAl2Si2O8 (BAS) glass–ceramic powders were prepared by sol–gel method. Graphene oxide (GO)/BAS mixture powders were prepared by a simple mixing process of GO and BAS. Dense and uniform reduced graphene oxide (RGO)/BAS composites were fabricated by the hot-pressing of GO/BAS, which was accompanied by the in-situ thermal reduction of GO. Microstructure, phase composition, dielectric and electromagnetic wave (EM) absorption properties of RGO/BAS were investigated. The results reveal that RGO can promote the hexacelsian-to-celsian phase transformation of BAS. In the frequency range from 8GHz to 12GHz, the complex permittivity of RGO/BAS increases with increasing RGO content. The composite with 1.5wt% of RGO shows good EM absorbing ability. When the sample thickness is 2.1mm, the minimum reflection coefficient (RC) reaches −33dB, and the effective absorption bandwidth is more than 3.1GHz.
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