Year: 2024
Type: article
Abstract: This study demonstrates the improvement of core loss through the reduction of eddy current loss in soft magnetic composites (SMCs) composed of TiO2-coated Fe powder and epoxy resin. A thin and uniform TiO2 insulating layer was successfully deposited on the surface of Fe powder via a sol-gel process, employing titanium (IV) butoxide (TBOT) as the precursor. Scanning transmission electron microscopy and energy-dispersive X-ray spectroscopy analyses confirmed the formation of a core/shell Fe/TiO2 structure, with a coating thickness of several tens of nanometers. Increasing the TBOT concentration and coating duration time led to an improved quality factor (Q factor) and a shift of the maximum Q factor values to higher frequency regions. Notably, the permeability was decreased slightly from 14.2 to 13.4, but the core loss, measured at various AC frequencies under 20 mT and then separated into hysteresis loss and eddy current loss at 1 MHz, was significantly reduced from 573 to 435 kW/m3 when the Fe powder was coated with TiO2 using a 2.5 wt.% TBOT solution for 8 h. This reduction in core loss is attributed to the effective suppression of inter-particle eddy currents by the TiO2 insulation layer.
Source: Journal of Composites Science
DOI: 10.3390/jcs8120521
Authors: Sunwoo Lee, Sungjoon Choi, Jae-Hyoung You, Jung-Woo Lee, Sang-Im Yoo, Chan Park
Institutions: Seoul National University, Hongik University
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,046
Award: G2236667734
OpenAlex ID: W4405330473