Effect of attrition time on the microwave permeability of magnetic Fe-Si-Al flakes

Han, Mangui; Liang, Difei; Xie, Jianliang; Deng, Longjiang

doi:doi:10.1063/1.3673813

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Fe-Si-Al particles with irregular shapes have been successfully milled into flaky shapes by attrition for 10, 20, and 30 h, respectively. The attrition time has very small effect on the static magnetic properties, but shows strong effects on the high frequency properties (permittivity and permeability). With increasing the attrition time, the values of permeability can be obviously enhanced, especially at lower frequencies. The high frequency permittivity values of flakes milled for 30 h are much larger than those of particles milled for 10 or 20 h. A multiple relaxation processes model has been used to study the permeability dispersion behaviors. Analysis show the variation of shape anisotropy could be the main cause for the observed changes in permeability dispersion behaviors. However, the electromagnetic wave absorption properties of composites filled with these flaky shape Fe-Si-Al particles are found deteriorated when the particles have been milled for longer time.

Article Outline

INTRODUCTION
EXPERIMENTAL DETAILS
RESULTS AND DISCUSSIONS
CONCLUSIONS

KEYWORDS, PACS, and IPC

Keywords

aluminium alloys, ball milling, electromagnetic wave absorption, high-frequency effects, iron alloys, magnetic anisotropy, magnetic particles, magnetic permeability, permittivity, silicon alloys

PACS

75.60.Ej

Magnetization curves, hysteresis, Barkhausen and related effects
75.50.Tt

Fine-particle systems; nanocrystalline materials
75.30.Gw

Magnetic anisotropy
81.20.Wk

Machining, milling
77.22.Ch

Permittivity (dielectric function)
75.40.Cx

Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)

International Patent Classification (IPC)

C22C38/00
Ferrous alloys, e.g. steel alloys
C22C21/00
Alloys based on aluminium

ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1063/1.3673813

PUBLICATION DATA

ISSN

0021-8979 (print)

1089-7550 (online)

Publisher

$abstract.society.value is a Member of CrossRef

American Institute of Physics

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