Preparation of Flake-Shaped Carbonyl Iron Powders Microwave Absorber and its Properties

Abstract:

The micron-sized flake-shaped carbonyl iron powder (FS-CIP) was prepared by wet ball milling method with ethanol as process control agent (PCA). Influence of the ratio of ball to powder on the microstructure, microwave electromagnetic parameter and reflectivity of the FS-CIP were studied. The results show that, with the increasing of the ratio of ball to powder, grain size of FS-CIP gradually decreases and the aspect ratio increased significantly. Beneficial the anisotropy of the FS-CIP, the magnetic loss and dielectric loss performance were enhanced dramatically. Epoxy resin was applied as binder. The single-layer microwave absorbing coatings with 1.0 mm in thickness and the FS-CIP volume fraction is 30% were prepared. The lightest coating weights 2.96 kg/m², when it meets the request of band width more than 10 GHz with in which the reflectivity less than-7.5 dB at the frequency range of 8~18 GHz.

• Periodical: Advanced Materials Research (Volume 1053)
• Pages: 15-20
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1053.15
• Online since: October 2014
• Authors: Li Ying Zhao, Li De Zhan, Fan Cong Zeng, Pin Gang Liu
• Keywords: Flake-Shaped Carbonyl Iron Particles, Microwave Absorber, Microwave Electromagnetic Parameter, Wet Ball Milling

References

[1] G. X. Tong, J. G. Guan, W. Wang, L. Y. Zhao, Preparation and properties of carbonyl iron/Al2O3 core-shell composite particles. Chinese Journal of Materials Research, 22(2008) 102-106.

[2] Z. H. Chen, D. Chen, Mechanical alloying and solid-liquid reaction milling. Beijing, 2005, pp.67-68.

[3] B. S. Zhang, G. Lu, Y. Feng, J. Xiong, H. X. Lu, Electromagnetic and microwave absorption properties of alnico powder composites. J. Magn. Magn. Mater., 299(2006) 205-210.

DOI: 10.1016/j.jmmm.2005.04.003

[4] X. Wang, R. Z. Gong, P. G. Li, L. Y. Liu, W. M. Chen, Effects of aspect ratio and particle size on the microwave properties of Fe–Cr–Si–Al alloy flakes. Mater. Sci. Eng. A., 466 (2007) 178-182.

DOI: 10.1016/j.msea.2007.02.051

[5] L. Z. Wu, J. Ding, H. B. Jiang, L. F. Chen, C. K. Ong, Particle size influence to the microwave properties of iron based magnetic particulate composites. J. Magn. Magn. Mater., 285(2005) 233-239.

DOI: 10.1016/j.jmmm.2004.07.045

[6] B. G. Moon, K. Y. Sohn, W. W. Park, T. D. Li, Effect of milling on the soft magnetic behavior of nanocrystalline alloy cores. Mater. Sci. Engi. A, 449-451(2007) 426-429.

DOI: 10.1016/j.msea.2005.12.103

[7] Q. Liang, F. S. Wen, J. Q. Wei, J. B. Wang, Microwave permeability spectra of flake-shaped FeCuNbSiB particle composites. J. Appl. Phys., 103(2008) 063903-063903-5.

DOI: 10.1063/1.2891671

[8] J. G. Guan, H. R. Ma, L. Y. Zhao, Z. H. Liu and Q. J. Zhang, China Patent ZL200510019877. 6. (2007).

[9] L.Y. Zhao, H.R. Ma, J.G. Guan, Influence of polyether segment length on mechanical properties of cured epoxy resins based on amino-terminated poly(ethylene glycol) and diglycidyl ether of bisphenol, Chemical Journal of Chinese Universities, 30(2009).

[10] P.H. Zhou, L.J. Deng, J.L. Xie, D.F. Liang, L. Chen, X.Q. Zhao, Nanocrystalline structure and particle size effect on microwave permeability of FeNi powders prepared by mechanical alloying, J. Magn. Magn. Mater., 292(2005) 325-331.

DOI: 10.1016/j.jmmm.2004.11.148

[11] P.H. Zhou, L.J. Deng, J.L. Xie, D.F. Liang, Effects of particle morphology and crystal structure on microwave properties of flake-like nanocrystallines Fe3Co2 particles, J. Alloys and Compounds, 448(2006) 303-307.

DOI: 10.1016/j.jallcom.2006.10.061

[12] E.K. Cho, H.T. Kwon, E.M. Cho, Y.S. Song, K.Y. Sohn, W.W. Park, The control of nano-grain size and magnetic properties of Fe73Si16B7Nb3Cu1 soft magnetic powder cores, Mater. Sci. Eng. A, 449-451(2007) 368-370.

DOI: 10.1016/j.msea.2006.02.376

[13] S.S. Kim, S.T. Kim, Y.C. Yoon, K.S. Li, Magnetic, dielectric, and microwave absorbing properties of iron particles dispersed in rubber matrix in gigahertz frequencies, J. Appl. Phys., 97(2005) 10F905-10F905-3.

DOI: 10.1063/1.1852371

[14] Y.B. Feng, T. Qiu, X.Y. Li, S.C. Ying, Microwave absorption properties of carbonyl iron/EPDM composite, Materials Science & Technology, 16(2008)589-592.

[15] Y.F. He, R.Z. Gong, X.C. Li, X. Wang, H.H. He, Preparation and microwave absorbing properties of muti-layered radar(microwave) absorbing materials composites, Journal of Inorganic Materials, 21(2006)1449-1453.