空心复相陶瓷微珠的自反应淬熄法制备及其吸波性能

Preparation by Self-reactive Quenching Technology and Microwave Absorption Property of Hollow Multiphase Ceramic Micro-spheres

以Al-TiO2-Fe-Fe2O3-MnO2-蔗糖为反应体系,在O2气氛下,采用自反应淬熄技术制备了磁性尖晶石空心复相陶瓷微珠吸波新材料,采用SEM、XRD和EDS表征了淬熄产物的外观、中空结构与物相。试验结果表明,体系具备良好的成球率,淬熄产物为空心结构,粒径分布均匀,保持在30～60μm之间,物相组成主要为Fe3O4、Mn2AlO4、Mn3O4、(Fe2.5Ti0.5)O4和Al2O3纳米复相结构;吸波测试表明,空心复相陶瓷微珠的最低反射率达到-17.6 dB,小于-10 dB的频段为-11～-13.9 GHz,具备了良好的吸波潜力。兼具良好磁性与电性能的纳米复相结构与特殊的空心结构是空心复相陶瓷微珠具备良好吸波潜力的根本原因。

Take Al-TiO2-Fe-Fe2O3-MnO2-sucrose as reactive system,in O2 atmosphere,a new type mi-crowave absorbing material of hollow multiphase ceramic micro-spheres was prepared by self-reactive quenching technology.The morphology,hollow structure and phase compositions were characterized by SEM,XRD and EDS.The results show that the system possesses high sphere formation rate,the quenching products are hollow structure and particle size is uniform between 30 μm and 60 μm.The phase compositions are nano-multiphase structure including Fe3O4,Mn2AlO4,Mn3O4,（Fe2.5Ti0.5）O4 and Al2O3.The lowest reflectivity of hollow multiphase ceramic micro-spheres is-17.6 dB.The frequency bands of less than-10 dB are-11——13.9 Hz.The essential reasons of hollow multiphase ceramic micro-spheres with better mi-crowave absorbing potential are nano-multiphase structure with magnetism and electricity and special hol-low structure.