Study On The Absorbing And Electromagnetic Property Of Modified Fillers Filled Resin Matrix Composites

With the development and application of wireless microwave technologies in electronic industry,electromagnetic wave has become a major potential hazard to human health,information security and sophisticated electronic equipment,electromagnetic shielding materials have attracted more and more attention.Therefore,the preparation of a kind of microwave absorbing material with thin thickness,lightweight,wide operating frequency band,good absorbing property and excellent environmental adaptability is in high demand.The microstructure and property of needlelike Fe₃O₄ layer modified FeNi alloy coated graphite flake?Fe-Ni-G?were studied through SEM,XRD and VSM.The results show that a uniform needlelike Fe₃O₄ layer is successfully prepared on the surface of Fe-Ni-G.The magnetic property of the Fe₃O₄-Fe-Ni-G greatly improves in comparison with original Fe-Ni-G.The magnetic saturation value increases from 60emu/g to 80 emu/g.The magnetic property and impedance matching performance of the Fe₃O₄-Fe-Ni-G are greatly enhanced in comparison with original Fe-Ni-G.Original fillers and modified fillers were blended with polyetheretherketone?PEEK?matrix and then molded to be composites?Fe₃O₄-Fe-Ni-G/PEEK?through hot-compression method.The results showed their absorbing property is much better than the Fe-Ni-G/PEEK composites.The influence of gaps on the electromagnetic shielding performance was also studied in this paper.The laser with appropriate power and scanning speed was used to treat Ni coated carbon fiber?Ni-CFs?filled polymer composites,and found that electromagnetic leakage was effectively decreased.Besides this effective and simple method can be used in industrial production.