Structure modulation at multiscale is crucialfor optimizing the electromagnetic wave absorption (EWA)properties of fiber-reinforced composites. Here we selectedtwo types of wave-absorbing SiC fibers as reinforcements....Structure modulation at multiscale is crucialfor optimizing the electromagnetic wave absorption (EWA)properties of fiber-reinforced composites. Here we selectedtwo types of wave-absorbing SiC fibers as reinforcements. TheL-fiber had a relatively low resistivity of ~3 Ω·cm and the Hfiberhad a high resistivity of ~7×10^(5)Ω·cm. To adjust the impedance,BN single coating and SiO_(2)/BN dual-coating wereprepared respectively on the L-fibers. Unidirectional prepregswith different fibers were stacked in different rules to obtainthe final composites. It showed that both the fiber coatings andstacking structure significantly influence the EWA performanceof the composites. Guided by computational optimization,the stacked composites exhibited superior reflectionloss (RL) lower than −10 dB across the whole X(8.2–12.4 GHz) and Ku (12.4–18.0 GHz) bands. It is interestingto find that the introduction of the surface coatings on theL-fibers significantly widens the available thickness range ofthe stacked composite for possessing excellent performance. Inparticular, dual-coating perform better in terms of broadeningthe available thickness range of the stacked composites.展开更多
基金supported by the Natural Science Foundation of Xiamen, China (3502Z202373011)the Fundamental Research Funds for the Central Universities (20720220066, 20720230027)the National Key Project of China (2022-JCJQ-ZD-067-11)。
文摘Structure modulation at multiscale is crucialfor optimizing the electromagnetic wave absorption (EWA)properties of fiber-reinforced composites. Here we selectedtwo types of wave-absorbing SiC fibers as reinforcements. TheL-fiber had a relatively low resistivity of ~3 Ω·cm and the Hfiberhad a high resistivity of ~7×10^(5)Ω·cm. To adjust the impedance,BN single coating and SiO_(2)/BN dual-coating wereprepared respectively on the L-fibers. Unidirectional prepregswith different fibers were stacked in different rules to obtainthe final composites. It showed that both the fiber coatings andstacking structure significantly influence the EWA performanceof the composites. Guided by computational optimization,the stacked composites exhibited superior reflectionloss (RL) lower than −10 dB across the whole X(8.2–12.4 GHz) and Ku (12.4–18.0 GHz) bands. It is interestingto find that the introduction of the surface coatings on theL-fibers significantly widens the available thickness range ofthe stacked composite for possessing excellent performance. Inparticular, dual-coating perform better in terms of broadeningthe available thickness range of the stacked composites.
