热喷涂技术制备空心陶瓷微珠吸波剂的结构与性能研究

Research on Structure and Performance of Hollow Ceramic Microspheres Absorbent Based on Thermal Spraying Technology

基于反应火焰热喷涂技术,以Al-Cr2O3-Fe-MnO2-Fe2O3-蔗糖为体系,利用Al-Cr2O3自蔓延反应体系的高放热、高活性促使Fe-MnO2-Fe2O3反应进行,以快速形成陶瓷熔滴的方法制备了由多相组成的空心陶瓷微珠吸波新材料。采用SEM、XRD对淬熄产物的外观、中空结构与物相进行了表征,通过矢量网络分析仪测定了淬熄产物的电磁参数。结果表明,淬熄产物为规则空心复相陶瓷微珠,主要由Al2O3、Cr3C2、Mn2AlO4等复相组成;在0.5～18 GHz间,吸波性能小于-10 dB的频段为13.1～17.8 GHz,反射率最低达到-28.5 dB。兼具良好磁性能与电性能的组成相以及特殊的空心结构是空心复相陶瓷微珠具备良好吸波性能的主要原因。

Taking Al＋TiO2＋Fe＋Fe2O3＋MnO2＋Sucrose as reactive system, Fe-MnO2-Fe2O3 reactions occur through high heat and reactivity of Al-Cr2O3, hollow multiphase ceramic micro-spheres absorbent was prepared based on thermal reaction spraying technology. The morphology, hollow structure and phase were characterized by SEM and XRD, and electromagnetic parameters of quenching products were measured by vector network analyzer. The results show that the quenching products are regular hollow multiphase ceramic microspheres. The phase components mainly include Mn2AlO4, Al2O3, and Cr3C2. From 0.5 to 18 GHz, the lowest reflectivity of hollow multiphase ceramic microspheres is -28.5 dB. The frequency bands of less than -10 dB are -13.1-17.8 GHz. The essential reason of hollow multiphase ceramic microspheres with well microwave absorbing property is both better magnetism and electricity and special hollow structure.