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No.1(pp.1-52)

Home > Issues > Volume 12 (2007) > No.1(pp.1-52)

Annealing Effect on Magnetic Properties and Electromagnetic Absorption Behaviors for Fe-Cr Alloy Powder-Polymer Composites

Journal of Magnetics, Volume 12, Number 1, 31 Mar 2007, Pages 49-52

Sung-Jae Lee(Center for Energy Materials Research, Korea Institute of Science and Technology), Yoon-Bae Kim(Advanced Metals Research Center, Korea Institute of Science and Technology), Kyung-Sub Lee(R&D Center, Chang Sung Corporation), Sang-Woo Kim*

(Center for Energy Materials Research, Korea Institute of Science and Technology)

Abstract

We investigated annealing effect of microforged powders on magnetic properties and electromagnetic absorption behaviors for ferromagnetic Fe-Cr metal alloy powder-polymer composites. The coercive properties greatly decreased with annealing temperature and the magnetic permeability had significantly increased after microforging and subsequent annealing treatment, due to a reduction in lattice strain of the microforged powders. The power loss in the far field regime also had greatly increased after microforging and subsequent annealing treatment in frequency range from 50 MHz to 6 GHz. As a result, the electromagnetic absorption of ferromagnetic Fe-Cr alloy metal powder-polymer composites was highly improved because of the relaxation of the internal strain during annealing process.

Keywords: electromagnetic shielding; soft magnetic properties; permeability; composites; radio frequency

DOI: 10.4283/JMAG.2007.12.1.49

Full Text: PDF

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