包覆钡铁氧体的多孔玻璃微珠吸波材料制备与性能

Preparation and Microwave Absorption Property of BaFe_(12)O_(19) Encapsulated Porous Glass Particles

以硝酸钡、硝酸铁、柠檬酸及多孔玻璃微珠制备前驱体,在60℃／h升温速率下加热至850℃,保温2h．研究了产物的结构组成、表面形貌、复介电常数与磁导率．实验表明,多孔空心玻璃微珠表面形成厚度<1μm六角磁铅型钡铁氧体BaFe12O19包覆层．包覆钡铁氧体的多孔玻璃微珠吸波粉体吸波性能良好．采用聚合物乳液与复合粉体制备了1．8mm厚的涂层．在5—18GHz内,涂层的微波反射损失>-8dB．在6GHz处最大为-15dB．

Barium ferrite encapsulated porous glass particles（BEPG）were prepared with a citrate sol-gel method. The precursors were obtained from barium nitrate,citric acid and porous glass particles and then calcined at 850℃ for 2h with 60℃/h heating rate. The microstructure, complex dielectric constant, complex permeability and microwave absorption of the production were tested by X-ray diffraction, scan election microscope （SEM） and network analyzer. It was found that the BaFe12O19 crystal coated the porous glass particles surfaces well, which in turn exhibited the microwave absorption property. Microwave absorber coating of BEPG with 1.8mm thick was made with latex matrix and the reflection loss was more than 8dB at the range of 5-18GHz. The peak of reflection losses was -15dB at 6 GHz.