Fe-based soft magnetic composites with high permeability and low core loss by in situ coating ZnFe2O4 layer
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Fe powder particles were coated with ZnFe2O4 layer by in situ oxidation and then mixed with epoxy-modified silicone resin. Soft magnetic composites were prepared by compaction and annealing treatment of the coated powders. The coating layer was analyzed using Lorentz transmission electron microscopy, scanning electron microscopy and energy-dispersive spectroscopy X-ray analysis. Their magnetic properties were determined using a vibrating sample magnetometer and an auto-testing system for magnetic materials (SY8258B-H/m). The results show that the samples prepared at 1200 MPa and 550 °C exhibited distinguished magnetic properties, with low core loss of 497 W/Kg (100 kHz, 50 mT) and high amplitude permeability of 63 whose frequency stability is up to 170 kHz. The Fe SMCs with excellent soft magnetic properties provide great potential for application of various fields such as transformers, sensors and electromagnetic actuation devices.
This work was supported by the National Key Research and Development Program (2016YFB0700302), the National Natural Science Foundation of China (Grant Nos. 51862030 and 51563020), the Science and Technology Project of Jiangxi Provincial Education Department (GJJ171130, GJJ171141).
This work was planned by Rutie Liu and Xiang Xiong, and executed by Shigeng Li; Shigeng Li, Rutie Liu and Xiang Xiong analyzed and wrote the final manuscript.
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Conflict of interest
The authors declare that they have no conflict of interest.
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