THE MICRO–FABRICATING PROCESS AND ELECTROMAGNETIC PROPERTIES OF TWO KINDS OF Fe POWDERS WITH DIFFERENT GRAIN SIZES AND INTERNAL STRAINS
Received date: 2010-03-10
Revised date: 2010-05-06
Online published: 2010-08-10
Supported by
Supported by National High Technology Research and Development Program of China (No.2006AA03A209) and Young Teachers from Fok Ying Tung Education Foundation (No.101049)
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.
ZHOU Jing , YU Wei , XUN Zhi-Gang , GUAN Jian-Guo . THE MICRO–FABRICATING PROCESS AND ELECTROMAGNETIC PROPERTIES OF TWO KINDS OF Fe POWDERS WITH DIFFERENT GRAIN SIZES AND INTERNAL STRAINS[J]. Acta Metall Sin, 2010 , 46(8) : 967 -972 . DOI: 10.3724/SP.J.1037.2010.00117
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