Soft magnetic properties regulation of FeSiBC amorphous powders/CIP magnetic powder core with single and double-layer core-shell structure

In this study, an equal proportion of carbonyl iron powder (CIP) was added to the FeSiBC amorphous powders, then three kinds of composite powders, namely Powder@EP(epoxy resin) with a single-layer core-shell structure, Powder@SiO2(silica powder)@EP and Powder@SI(silicone resin)@EP with a double-layer core-shell structure, were synthesized and prepared into corresponding SMPCs (soft magnetic powder cores). The results show that the FeSiBC amorphous powders exhibit good sphericity, a high saturation magnetization (153.534 emu center dot g (1)), and a wide undercooled liquid region (Delta T = 51 K). When mixed with CIP, its saturation magnetization increased from 153.534 emu center dot g(-1) to 189.875 emu center dot g(-1), which is an ideal raw material for preparing SMPCs. The three SMPCs after insulation coating treatment have high permeability (29.3 similar to 34.2), high DC bias performance (76.26 similar to 84.11, 100 Oe), and low core loss (762.66 similar to 902.69 mW center dot cm(-3), 200 Gs, 1000 kHz), and excellent overall soft magnetic performance. Finally, the loss separation analysis of the magnetic core loss of SMPCs shows that the loss of Powder@SI@EP soft magnetic powder cores with a double-layer organic core-shell structure is only 762.66 mW center dot cm(-3) at 200 Gs and 1 MHz, which is much lower than that of SMPCs with a single-layer core-shell structure (902.69 mW center dot cm(-3), 200 Gs, 1000 kHz). At the same time, the permeability of SMPCs (31.0) is relatively high, and the comprehensive performance is good in the high-frequency range.