论文部分内容阅读
采用溶胶-凝胶自蔓延燃烧法制备出漂珠/钡铁氧体低密度磁性复合材料,用扫描电镜、热重-差热分析仪、X射线衍射仪、振动样品磁强计和矢量网络分析仪表征了样品的形貌、结构、电磁性能和吸波性能。结果表明:在漂珠表面形成的钡铁氧体包覆层厚度为5-15 nm,颗粒粒径均小于60 nm。复合材料由六角晶钡铁氧体、α-氧化铁及少量莫来石和石英组成,其磁性能随钡铁氧体与漂珠质量比的增大而增强。复合材料在2-18 GHz频段具有较好的介电损耗和磁损耗性能,当吸波材料厚度为1.5 mm、在14.2 GHz处反射损耗峰值为-29.2 d B,反射损耗小于-10 dB的带宽为4.5 GHz。
The floating-bead / barium ferrite low-density magnetic composites were prepared by sol-gel self-propagating combustion method and characterized by scanning electron microscopy, TG-DTA, XRD, The instrument characterizes the morphology, structure, electromagnetic properties and absorbing properties of the sample. The results show that the barium ferrite coating formed on the surface of floating beads has a thickness of 5-15 nm and particle sizes of less than 60 nm. Composites consist of hexagonal barium ferrite, α-iron oxide and a small amount of mullite and quartz, and their magnetic properties are enhanced with the mass ratio of barium ferrite to bleaching beads. The composites have better dielectric loss and magnetic loss performance in the 2-18 GHz frequency band. When the absorbing material thickness is 1.5 mm, the peak value of reflection loss at 14.2 GHz is -29.2 d B and the reflection loss is less than -10 dB 4.5 GHz.