Enhancing High-Frequency Magnetic Performance of Fe-Based Amorphous Alloy Powders Coated with Insulating Glass Frits

IF 2.1 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Electronic Materials Letters Pub Date : 2025-02-15 DOI:10.1007/s13391-025-00550-2

Seung-Wook Kim, Tae-Kyung Lee, Ye-Ji Son, Hyo-Min Kim, Dae-Yong Jeong

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Abstract

Amorphous metal powders, known for their high saturation magnetization, low coercivity (H_c), and reduced eddy current loss, hold great promise for high-performance magnetic devices. However, elevated core losses at higher frequencies—primarily due to eddy currents—impair their efficiency, leading to significant heat dissipation. This study addresses this challenge by investigating the application of low-softening temperature (T_s) glass frits as an insulating coating to enhance the electrical and magnetic properties of Fe_92.3Si_3.5B_3.0C_0.7P_0.5 (wt%) amorphous alloy powders. The practical implications of this research are significant, as it offers a potential solution to the problem of core losses at higher frequencies. The coated powders exhibited superior performance, with the lowest core loss measured at less than 321 mW/cm³ (B_m = 0.2 T at 1 MHz) and a high powder resistivity of up to 1.81 × 10⁹ Ω∙cm while maintaining appropriate permeability. Calculation and experimental results demonstrated that adjusting the coating thickness and ensuring a uniform layer minimized inter-particle and intra-particle eddy current losses. This optimization led to a significant reduction in core loss, enhancing the material’s high-frequency performance. The study emphasizes the critical role of low T_s glass frits in balancing resistivity, magnetic properties, and core loss reduction, offering a practical pathway for developing efficient amorphous alloy powders for advanced magnetic applications, including compact inductors and energy-efficient devices in eco-friendly technologies.

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来源期刊

Electronic Materials Letters 工程技术-材料科学：综合

CiteScore

4.70

自引率

20.80%

发文量

审稿时长

2.3 months

期刊介绍： Electronic Materials Letters is an official journal of the Korean Institute of Metals and Materials. It is a peer-reviewed international journal publishing print and online version. It covers all disciplines of research and technology in electronic materials. Emphasis is placed on science, engineering and applications of advanced materials, including electronic, magnetic, optical, organic, electrochemical, mechanical, and nanoscale materials. The aspects of synthesis and processing include thin films, nanostructures, self assembly, and bulk, all related to thermodynamics, kinetics and/or modeling.