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Acta Metall Sin  2010, Vol. 46 Issue (8): 967-972    DOI: 10.3724/SP.J.1037.2010.00117
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THE MICRO–FABRICATING PROCESS AND ELECTROMAGNETIC PROPERTIES OF TWO KINDS OF Fe POWDERS WITH DIFFERENT GRAIN SIZES AND INTERNAL STRAINS
ZHOU Jing, WANG Wei, SUN Zhigang, GUAN Jianguo
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070
Cite this article: 

ZHOU Jing WANG Wei SUN Zhigang GUAN Jianguo. THE MICRO–FABRICATING PROCESS AND ELECTROMAGNETIC PROPERTIES OF TWO KINDS OF Fe POWDERS WITH DIFFERENT GRAIN SIZES AND INTERNAL STRAINS. Acta Metall Sin, 2010, 46(8): 967-972.

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Abstract  

The micro–fabricating process and electromagnetic properties of two kinds of Fe powders with different grain sizes and internal strains were studied. The results show that the homemade Fe powders with smaller grain size, larger internal strain and surface roughness than the carbonyl Fe powders, evolve into big and thin Fe flakes by micro–fabricating for 10 h with the help of the process control agent (PCA). When micro–fabrication for t=12 h, these Fe flakes will fracture and their average width will reduce due to strong internal strain. When t is further prolonged to 24 h, these Fe flakes become thinner, finally, those with larger aspect ratio and smaller width can be obtained, which show high permeability and low permittivity. The epoxy resin-based microwave absorbing materials containing such Fe flakes of 20% (volume fraction) exhibit a reflection loss less than −10 dB in the 9.4—17.9 GHz frequency range with a minimal peak of −14.6 dB, whose average thickness is 1.5 mm.

Key words:  Fe flake      micro–fabrication      electromagnetic parameter      microwave absorbing properties     
Received:  10 March 2010     
Fund: 

Supported by National High Technology Research and Development Program of China (No.2006AA03A209) and Young Teachers from Fok Ying Tung Education Foundation (No.101049)

URL: 

https://www.ams.org.cn/EN/10.3724/SP.J.1037.2010.00117     OR     https://www.ams.org.cn/EN/Y2010/V46/I8/967

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