Acta Metallurgica Sinica (English Letters) ›› 2018, Vol. 31 ›› Issue (2): 171-179.DOI: 10.1007/s40195-017-0612-5

Special Issue: 2018年复合材料专辑

• Orginal Article • Previous Articles     Next Articles

Enhanced Microwave Absorption Properties of Double-Layer Absorbers Based on Spherical NiO and Co0.2Ni0.4Zn0.4Fe2O4 Ferrite Composites

Pei-Jiang Liu1,2,3, Zheng-Jun Yao1,2(), Vincent Ming Hong Ng3, Jin-Tang Zhou1,2, Zhi-Hong Yang1, Ling-Bing Kong3()   

  1. 1.College of Materials and TechnologyNanjing University of Aeronautics and AstronauticsNanjingChina
    2.Jiangsu Key Laboratory of Advanced Structural Materials and Application TechnologyNanjingChina
    3.School of Materials Science and EngineeringNanyang Technological UniversitySingaporeSingapore
  • Received:2017-06-21 Revised:2017-06-21 Online:2018-02-20 Published:2018-03-20
  • About author:

    About author:Lin Lv and Feng-Qing Wang have contributed equally to this work.

Abstract:

Microwave absorption properties of spherical NiO particles and Co0.2Ni0.4Zn0.4Fe2O4 (CNZF) ferrites with single-layer and double-layer absorbers were studied in the frequency range of 2-18 GHz. The spherical NiO particles were synthesized by using a hydrothermal process, while the CNZF powders were prepared by using a sol-gel autoignition method. The double-layer absorbers, composed of 30 wt% NiO as matching layer and 30 wt% CNZF as absorption layer, with a total thickness of 3.2 mm, exhibited a maximum reflection loss (R L) of -67.0 dB at 9.2 GHz and an effective absorbing bandwidth below -10 dB to be 3.9 GHz from 7.0 to 10.9 GHz. The excellent microwave absorption performance of the double-layer absorbers should be ascribed to the high impedance matching ratio, the great microwave attenuation capability, and well-coupled layer.

Key words: Hierarchical NiO particle, Ferrite, Impedance matching, Microwave absorption property