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论文类型：期刊论文

发表时间：2017-02-01

发表刊物：JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS

收录刊物：EI、SCIE、Scopus

卷号：28

期号：3

页面范围：3075-3082

ISSN号：0957-4522

摘要：FeSiAl powder (FSA)/water-based varnish (WV) microwave-absorbing coatings with discrete structure (DMCs) were fabricated, and the effects of the discrete structure on their impedance matching and absorption performance were investigated. The electromagnetic parameters of FSA were determined in the frequency range 2-18 GHz using transmission/reflection measurements. The microwave absorption (MA) properties of the coatings were determined by measuring the reflection loss using the arch method. The normalized input impedances of the DMCs with different coatings were calculated for the investigation of impedance matching. The results showed that, compared with conventional coatings, the discrete-structure coating has superior impedance matching and delivers clearly enhanced MA performance. When the concentration of FeSiAl is 17 wt%, the absorption peak reaches -12.5 dB from -5.8 dB, and the qualified frequency bandwidth is 2.5 GHz. Furthermore, the effect of the discrete unit size and coating thickness on the impedance matching and absorption performance of the coatings were investigated.