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采用球磨法制备Fe/Al2O3纳米复合物,并在氩气保护下退火,研究了退火对Fe/Al2O3纳米复合物的微观结构、磁性和微波吸收性能的影响。结果表明,退火使样品的晶粒尺寸增大,缺陷减少,微观应力得到释放;同时,退火使Al2O3的缺陷发光峰强度明显减弱,398 nm和484 nm处的发光峰发生蓝移。厚度为7.7 mm的球磨样品,其反射损耗在15.5 GHz频率处达到最大值-11.4 dB。退火使样品的介电损耗和磁损耗均增大,电磁波吸收性能明显提高,厚度为6.4 mm时反射损耗在17 GHz频率处达到最大值-35.5 dB。
The Fe / Al2O3 nanocomposites were prepared by ball milling and annealed under argon gas. The effects of annealing on the microstructure, magnetic properties and microwave absorption properties of Fe / Al2O3 nanocomposites were studied. The results show that annealing makes the grain size of the sample increase, the defects decrease and the micro-stress is released. At the same time, the intensity of defects in the defect of Al2O3 is significantly weakened by annealing, and the luminescence peaks at 398 nm and 484 nm are blue-shifted. Ball mill samples with a thickness of 7.7 mm have a reflection loss of -11.4 dB maximum at 15.5 GHz. After annealing, the dielectric loss and magnetic loss of the samples are both increased, and the electromagnetic wave absorption performance is significantly improved. The reflection loss reaches the maximum of -35.5 dB at the frequency of 17 GHz at the thickness of 6.4 mm.