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No.3(pp.119-150)

Home > Issues > Volume 11 (2006) > No.3(pp.119-150)

Magnetic Properties of Amorphous FeCrSiBC Alloy Powder Cores Using Phosphate-coated Powders

Journal of Magnetics, Volume 11, Number 3, 30 Sep 2006, Pages 126-129

Dae-Ho Jang(School of Advanced Materials Engineering, Andong National University), Kwang-Youn Kim(Advanced Metals Research Center, Korea Institute of Science & Technology), Tae-Hwan Noh*

(School of Advanced Materials Engineering, Andong National University)

Abstract

The phosphate coating on the (Fe_0.97Cr_0.03)₇₆(Si_0.5B_0.5)₂₂C₂ amorphous powders with an average size of 10 μm in diameter has been carried out in aqueous 1.0-2.0 wt% H₃PO₄ solutions, and the consolidation behavior and magnetic properties of their compressed powder cores has been investigated. The phosphate coating could provide efficient electrical insulation between amorphous powders and improved consolidation ability at room temperature. Especially when the powders were treated in more concentrated phosphoric acid solution, enhanced phosphate covering and higher frequency/dc-bias stability were achieved. The powder cores phosphate- coated in 2.0 wt% H₃PO₄ solution exhibited constant permeability of 21 up to 10 MHz, 110 of the quality factor at 0.9 MHz, 610 mW/cm³ core loss at 100 kHz/0.1 T and 89 of percent permeability at 100 kHz.

Keywords: phosphate coating; high-frequency magnetic properties; Fe-based amorphous alloy powder cores; cold pressing

DOI:

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