4.7 Article

Microstructure and magnetic properties of FeSiCr soft magnetic powder cores with a MgO insulating layer prepared by the sol-gel method

Journal

CERAMICS INTERNATIONAL
Volume 48, Issue 15, Pages 22237-22245

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2022.04.227

Keywords

Soft magnetic powder cores; MgO insulating layer; DC-bias performance; Soft magnetic properties

Funding

  1. Youth Innovation Promotion Associa-tion CAS [2021294]
  2. Science and Technology Service Network Initiative of the Chinese Academy of Sciences [KFJ-STS-QYZD-2021-07-002]
  3. S & T Innovation 2025 Major Special Program [2021Z038, 2018B10031, 2018B10085]
  4. Na-tional Natural Science Foundation of China [U1809216]
  5. K.C. Wong Magna Fund in Ningbo University

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In this study, the electromagnetic properties of FeSiCr soft magnetic powder cores were optimized by a novel insulation process. The research found that the best soft magnetic performance was achieved when the content of magnesium acetate tetrahydrate was 0.50 wt%. The FeSiCr@MgO SMPCs also showed improved heat dissipation performance, enhancing their applicability in high-frequency and high-current environments.
In this study, the electromagnetic properties of FeSiCr soft magnetic powder cores (SMPCs) were optimized by providing a novel insulation process. Magnesium acetate tetrahydrate and oxalic acid dihydrate were used as raw materials for the sol-gel method. The powder was then heat-treated at 700 C so that it was evenly coated by an insulating layer. Thermogravimetric analysis-differential scanning calorimetry, X-ray diffraction, Fourier transform infrared spectroscopy, and energy dispersive spectroscopy were used to demonstrate that the layer heat treated at 700 ? was the ideal MgO layer and was uniformly coated on the surface of the FeSiCr powder. Additionally, the potential reactions and growth mechanism of the MgO layer were analyzed. The effects of the magnesium acetate tetrahydrate content on the soft magnetic properties of the FeSiCr@MgO SMPCs were investigated. The optimal soft magnetic performance (Pcv = 248.48 mW/cm(3), measured at 2500 kHz and 10 mT) was achieved at a magnesium acetate tetrahydrate content of 0.50 wt%, yielding a direct current-bias performance of up to 92.3% at 100 Oe. In addition, the FeSiCr@MgO SMPCs effectively improved the heat dissipation performance, which is necessary to avoid high-temperature damage, thereby enhancing their applicability in high-frequency and high-current environments.

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