锶铁氧体包覆铁纤维的吸波机理及热动力学研究

项目名称： 锶铁氧体包覆铁纤维的吸波机理及热动力学研究

项目编号： No.11264023

项目类型： 地区科学基金项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 冯旺军

作者单位： 兰州理工大学

项目金额： 60万元

中文摘要： 微波吸收材料广泛用于军事隐身技术，理想的吸波材料要求频带宽、磁导率高，密度小,有良好的耐温性和环境稳定性。多晶铁纤维比重小,在很宽的频带内吸收率高,但电阻率小，容易对电磁波产生屏蔽降低其吸收效果。六角晶锶铁氧体的电阻率和自然共振频率高，高频时不易产生趋肤电流，可保持较高的磁导率，其介电常数较小，容易通过复合调节吸波涂层的电磁参数,但其比重大、吸波频率较窄、涂层厚、居里温度低、高温特性差。依据多晶金属纤维和六角晶锶铁氧体特性互补的特点,将两者以核壳结构的方式复合,可提高材料的电磁性能和微波吸收强度。本项目用溶胶-凝胶法制备纳米六角晶锶铁氧体包覆亚微米级金属铁纤维的核壳结构复合吸波纤维。研究制备条件对其物相、结构、形貌、两相交换耦合、电磁性能及吸波特性的影响,探索复合纤维的形成及其吸波机理。确定成胶共沉淀的热力学条件，建立柠檬酸与金属离子形成强络合的理论模型与复合纤维凝聚生长的动力学方程。

中文关键词： 铁氧体磁性纳米粉体；聚苯胺；羰基铁；核壳结构；吸波性能

英文摘要： The microwave absorbing materials is widely applied in military stealthy technology. The absorbing materials should satisfy broadband, high permeability,light density,good resistance to high temperature and stability in acidity or alkaline.polycrystalline iron fiber has low density and high absorptivity in the broadband, but electromagnetic shielding due to low resistivity will reduce electromagnetic wave absorptive properties. Hexagonal ferrite SrFe12O19 has high resistivity and resonant frequency,It has high permeability due to no skin electric current.so,It has better mincrowave absorbing capability.The SrFe12O19 has low permittivity，it is easy to regulate electromagnetic parameters of radar absorbing coatings use the method of compounding. SrFe12O19 has greater specific gravity,narrow absorption frequency,thick coating,low Curie Temperature,poor high temperature Characteristic.The composite of polycrystalline iron fiber and SrFe12O19 will have better electromagnetic properties and high absorptivity based on their complementary properties.The composite microwave absorbing fiber of polycrystalline iron fiber-SrFe12O19 with core-shell structure were prepared by ol-gel method.The influence of preparation condition on the phases, structure, morphology, exchange-coupling interaction between the phases, elect

英文关键词： ferrite magnetic nano-powder；PANI；carbonyl iron powder；core-shell structure；absorbing properties