A study of electromagnetic characteristics of Fe-Si-Al magnetic alloy

Author

Aiping, Huang ; Zekun, Feng ; Haihua, Li ; Huahui, He

Author_Institution

Dept. of Electron. Sci. & Technol., Huazhong Univ. of Sci. & Technol., Wuhan, China

fYear

2002

fDate

21-24 May 2002

Firstpage

413

Lastpage

416

Abstract

Fe-Si-Al magnetic alloy powders, consisting of Si 9.7wt%-Al 5.4wt%-bal Fe, were prepared by mechanical alloying. The appearance, phase composition, complex permeability μ˙, complex permittivity ε˙ of different milling time samples were measured respectively by SEM, X-ray diffraction and microwave vector network analysis in the 2-18 GHz band. Variations of the electromagnetic characteristics in the mechanical alloying process were analyzed. The aspect ratio of samples increased with the milling time, and the aspect ratio about 50-60 of the 300 h milling sample was observed by SEM. The X-ray diffraction peak of the 300 h milling sample was the most screechy, and the values of μ\´ and μ" were over 3.7 and 2.0 respectively. The frequency dependence of reflection loss of the 300 h milling samples with different thickness was measured by the Agilent 8722ES microwave vector network analyzer. Result showed that the electromagnetic characteristics of the materials can be controlled by the variation of the mechanical alloying process. These novel materials can be used in EMC systems.

Keywords

aluminium alloys; electromagnetic compatibility; electromagnetic interference; electromagnetic wave absorption; ferromagnetic materials; iron alloys; magnetic particles; magnetic permeability; mechanical alloying; microwave materials; permittivity; powders; silicon alloys; 2 to 18 GHz; 300 h; EMC; EMI; Fe-Si-Al; Fe-Si-Al magnetic alloys; SEM; X-ray diffraction peaks; alloy appearance; alloy electromagnetic characteristics; aspect ratio; complex permeability; complex permittivity; magnetic alloy powders; mechanical alloying; microwave absorption; microwave vector network analyzers; phase composition; reflection loss frequency dependence; sample milling time; sample thickness; Alloying; Electromagnetic diffraction; Electromagnetic measurements; Iron alloys; Microwave measurements; Milling; Permeability; Powders; Silicon alloys; X-ray diffraction;

fLanguage

English

Publisher

ieee

Conference_Titel

Electromagnetic Compatibility, 2002 3rd International Symposium on

Print_ISBN

0-7803-7277-8

Type

conf

DOI

10.1109/ELMAGC.2002.1177458

Filename

1177458