Preparation and Microwave Absorbing Properties of FexNi1-x Alloy Powders
YAO Yong-lin1, ZHANG Chuan-fu2, FAN You-qi1, ZHAN Jing2
1. School of Metallurgical Engineering, Anhui University of Technology, Maanshan 243032, Anhui, China;
2. School of Metallurgy and Environment, Central South University, Changsha 410083, China
摘要采用草酸盐沉淀-前驱体热分解法制备不同成分的FexNi1-x（0 < x < 1）合金粉。采用XRD和SEM分别测试前驱体和合金粉的物相结构与形貌。结果表明：随着Ni含量增大，前驱体物相由FeC2O4·2H2O逐渐向NiC2O4·2H2O转变，形貌由短棒状向立方体、多面体转变。FexNi1-x合金粉的几何外形与前驱体基本一致，但结构上呈多孔状，且粒径变小。FexNi1-x合金粉的物相结构随其成分变化，由富铁的bcc结构向富镍的fcc结构转变。测试不同成分FexNi1-x合金粉与石蜡复合物的电磁参数，并计算其吸波性能，Fe0.5Ni0.5具有最大的电磁损耗能力，厚3.0mm时在6.82GHz处具有最小反射损耗RL，为-52.58dB。Fe0.6Ni0.4具有最大有效频宽，厚1.5mm时反射损耗小于-10dB的有效频宽达4.02GHz。
Abstract：The FexNi1-x (0 < x < 1) alloy powders with different compositions were prepared by an oxalate precipitation-precursor thermal decomposition process. The phase structure and morphology of the precursor and FexNi1-x powder were characterized by XRD and SEM, respectively. With the increase of Ni content, the phase structure of precursor was gradually changed from FeC2O4·2H2O to NiC2O4·2H2O, and the morphology was changed from short rod to cube and polyhedron. The FexNi1-x powders show porous structure and its geometric shape is similar to the corresponding precursor and the particle size becomes smaller. The phase structure of FexNi1-x powders is changed with the composition from iron-rich bcc to nickel-rich fcc structure. The electromagnetic parameters of the composites of FexNi1-x powders and paraffin were measured and the microwave absorbing properties were calculated. The results reveal that Fe0.5Ni0.5 sample shows a best electromagnetic loss, and when the composite thickness is 3.0mm, the minimum RL reaches -52.58dB at 6.82GHz. Fe0.6Ni0.4 sample with a thickness of 1.5mm shows a maximum effective bandwidth (RL<-10dB), which reaches up to 4.02GHz.
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2018, Vol. 46 
