熔融沉积成型Fe_(3)O_(4)-MWCNTs/PLA微波吸收材料性能  

Properties of microwave absorbers formed by fused deposition modeling with Fe_(3)O_(4)-MWCNTs/PLA composite wire

作　　者：黄才华[1,2] 黄陈 吴海华 高琦[2] 叶喜葱 HUANG Caihua;HUANG Chen;WU Haihua;GAO Qi;YE Xicong(Hubei Engineering Research Center for Graphite Additive Manufacturing Technology and Equipment,China Three Gorges University,Yichang 443002,China;College of Mechanical&Power Engineering,China Three Gorges University,Yichang 443002,China)

机构地区：[1]三峡大学石墨增材制造技术与装备湖北省工程研究中心,宜昌443002 [2]三峡大学机械与动力学院,宜昌443002

出　　处：《复合材料学报》2024年第4期1954-1967,共14页Acta Materiae Compositae Sinica

基　　金：湖北省技术创新专项重大项目(2019AAA164)——高性能石墨烯基材料制备关键技术研究。

摘　　要：具有轻质高强、宽吸收带、薄厚度和热稳定性的电磁吸收材料是实现微波吸收应用的核心要求。本文以聚乳酸(PLA)为基体,Fe_(3)O_(4)和多壁碳纳米管(MWCNTs)为填料,通过球磨混合和熔融挤出法制备出Fe_(3)O_(4)-MWCNTs/PLA复合线材,利用熔融沉积成型(FDM)制备出Fe_(3)O_(4)-MWCNTs/PLA复合材料。采用XRD、SEM和矢量网络分析仪分别对复合材料的物相结构、微观形貌和电磁特性进行了表征,并研究了Fe_(3)O_(4)含量对复合材料吸波性能的影响。Fe_(3)O_(4)与MWCNTs-PLA复合形成的复合吸波材料质量轻、稳定性好、介电性能可调,因其良好的阻抗匹配和电磁波衰减能力而表现出优异的宽带吸收能力。实验结果表明:Fe_(3)O_(4)含量达到25wt%,厚度为1.4 mm时,反射损耗达到−48.5 dB,有效吸收带宽达到6.78 GHz(10.38~17.16 GHz),表现出优异的微波吸收性能。Electromagnetic absorbing materials with light weight,high strength,wide absorption band,thin thickness and thermal stability are the core requirements for microwave absorption applications.In this paper,Fe_(3)O_(4)-MWCNTs/PLA composite wires were prepared by ball milling mixing and melt extrusion using polylactic acid(PLA)as matrix,Fe_(3)O_(4)and multi-walled carbon nanotubes(MWCNTs)as fillers,and Fe_(3)O_(4)-MWCNTs/PLA composites were prepared by melt deposition molding(FDM).The phase structure,microstructure and electromagnetic properties of the composites were characterized by XRD,SEM and vector network analyzer,respectively.The composite absorbing material of Fe_(3)O_(4)-MWCNTs/PLA has light weight,good stability,and adjustable dielectric properties,which exhibits excellent broadband absorption ability due to its good impedance matching and electromagnetic wave attenuation ability.The experimental results show that when the Fe_(3)O_(4)content reaches 25wt%and the thickness is 1.4 mm,the reflection loss reaches−48.5 dB and the effective absorption bandwidth reaches 6.78 GHz(10.38-17.16 GHz),showing excellent microwave absorption performance.

关 键 词：介电损耗 磁损耗 Fe_(3)O_(4) 碳纳米管 阻抗匹配 

分 类 号：TB333[一般工业技术—材料科学与工程]