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No.2(pp.53-100)

Home > Issues > Volume 14 (2009) > No.2(pp.53-100)

Structure and Magnetic Properties of a Fe_73.5Si_13.5B9Nb₃Cu₁ Alloy Nanopowder Fabricated by a Chemical Etching Method and Milling Procedure

Journal of Magnetics, Volume 14, Number 2, 30 Jun 2009, Pages 71-74

Seongmin Hong(Department of Materials Science and Engineering, Chungnam National University), JeongGon Kim(Major of Image Printing, Incheon City College), CheolGi Kim*

(Department of Materials Science and Engineering, Chungnam National University,)

Abstract

The magnetic and structural properties of FINEMET (the Hitachi product name of the Fe-Si-B-Nb-Cu alloy) nanopowder with a composition of Fe_73.5Si_13.5B₉Nb₃Cu₁atomic percent were investigated after annealing, chemical etching, and mechanical milling. The primary and secondary crystallization temperatures were 523 and 550 ^oC, respectively. The grain size of the particles was adjusted by annealing time. Optimally annealed particles exhibited a homogenous microstructure composed of nanometer-sized crystalline grains. The grain boundary of the annealed particles was etched preferentially by chemical etching. Chemically etched particles were broken at the grain boundary by high-energy ball milling. As a result, a nanometer-sized FINEMET powder with a uniform size of crystalline grains was fabricated.

Keywords: Fe73.5Si13.5B9Nb3Cu1 alloy; chemical etching; ball milling

DOI: 10.4283/JMAG.2009.14.2.71

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