目的：制备高性能 NiFe1.98 Nd0.02 O4-Fe 双层吸波涂层。方法采用溶胶凝胶自燃烧法制备钕掺杂 NiFe1.98 Nd0.02 O4。借助 X 射线衍射仪、扫描电镜和矢量网络分析仪对 NiFe1.98 Nd0.02 O4和羰基铁的结构、形貌、电磁参数进行测试分析。采用遗传算法对 NiFe1.98 Nd0.02 O4-羰基铁双层涂层的厚度进行优化设计。结果以环氧树脂为基体,以羰基铁和 NiFe1.98 Nd0.02 O4为吸波剂的双层吸波涂层具备较好的吸波性能,厚度约1 mm,反射率在9.25~11.35 GHz 范围内均小于-10 dB。结论 NiFe1.98 Nd0.02 O4层和羰基铁层在吸波性能上有很好的互补性,理论优化结果和实验结果相同。
Objective To prepare high-performance double-absorbing coating NiFe1. 98 Nd0. 02 O4-Fe. Methods Nd substituted nickel ferrites (NiFe1. 98 Nd0. 02 O4 ) were prepared using the sol-gel-autocombustion method. The microstructures,morphology and the electromagnetic properties of NiFe1. 98 Nd0. 02 O4 and carbonyl iron were characterized with X-ray diffraction (XRD), scanning e-lectron microscopy (SEM) and a vector network analyzer. The thickness of double-layers microwave absorption coating was opti-mized by the genetic algorithm (GA). Results Using carbonyl iron and NiFe1. 98 Nd0. 02 O4 as absorbents, double composite absorb-ing coating with thickness d=1 mm was prepared. The results showed that the reflection loss of coating was less than -10 dB over the range from 9. 25 GHz to 11. 35 GHz. Conclusion The results of measurements showed that the microwave absorption property of NiFe1. 98 Nd0. 02 O4 and carbonyl iron were complementary to each other. The calculated RL agreed closely with the experimental re-sults in the whole measured frequency range.
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