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

초록

Amorphous metal powders, known for their high saturation magnetization, low coercivity (Hc), 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 (Ts) glass frits as an insulating coating to enhance the electrical and magnetic properties of Fe92.3Si3.5B3.0C0.7P0.5 (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/cm(3) (Bm = 0.2 T at 1 MHz) and a high powder resistivity of up to 1.81 x 109 ohm center dot 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 Ts 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.

키워드