Tb掺杂Fe基纳米晶片状微波吸收剂制备

Preparation of Fe-based nanocrystalline flakes with Tb doping as microwave absorbers

采用气体雾化工艺制备的Tb掺杂Fe合金粉为原料,经高能球磨处理和真空退火处理制备薄片状外形和纳米晶微结构的Tb掺杂Fe基合金吸收剂;选用改性聚氨酯为胶粘剂,以Tb掺杂Fe基合金吸收剂为填料制备了吸波涂层。研究了掺杂稀土元素Tb对合成材料微波电磁特性的影响,并对Tb掺杂的Fe基合金吸收剂的微波电磁参量和吸波性能做了测量和分析评价。结果表明,重稀土元素Tb的掺入能有效调整材料的微波磁导率及其频响特性,有利于获得高微波磁导率和大磁损耗(2GHz处,试样的复磁导率实部μ′和虚部μ″分别达6.1和4.3);基于Tb掺杂的Fe基纳米晶薄片状吸收剂制备的薄层吸波涂料在2～18GHz的微波宽频带具有良好的吸波性能(厚度1mm涂层的全频段吸波性能优于-4.5dB),可以应用于民用抗电磁辐射干扰和军事隐身技术领域。

Nanocrystalline flakes of Fe-based alloy with Tb doping were synthesized by atomization process,high energy ball milling and sequent annealing.The microwave absorbing coating was made of the Fe-based alloy fillers and polyester.Effect of doping Tb on the microwave complex permeability and permittivity of the synthesized materials was investigated.The microwave electromagnetic properties and absorbing ability were measured and analyzed.Results show that the microwave permeability characteristics of the studied materials is adjusted effectively and better performance of alloys with higher permeability and loss is presented at a suitable Tb content.μ＇ and μ″ attain 6.1 and 4.3 respectively.The coating of 1mm thickness made of the Fe-based alloy flakes presents favorable absorbing performance （lower than-4.5dB） in the frequency range of 2-18GHz.These materials can be applied in the field of anti-electromagnetic interfere and stealthy technology.