Effect of Compaction Parameters on the Magnetic and Corrosive Properties of Soft Magnetic Composites with Parylene Insulation
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Iron-based soft magnetic composites insulated with parylene C film were prepared via chemical vapor deposition polymerization, and their morphologies, magnetic properties, and corrosive resistance were investigated. Scanning electron microscopy and Fourier transform infrared spectrum confirmed that the surface of the iron particle was completely uniform insulated with parylene C, resulting in reducing the core loss of the synthetic compacts. The results show that compressed pressure has an important influence on the magnetic properties of the soft magnetic composites, enhance the magnetic induction value from 0.64 to 1.01 T and is obtained with increased the compressed pressure from 300 to 650 MPa. The loss separation results show that the hysteresis loss coefficient of 4 wt% parylene C insulated samples decreased from 1.743 to 1.657 and eddy current loss coefficient decreased from 0.019 to 0.012 as compared with uncoated compacts under the same compress pressure. The acid and salt corrosion resistance of the iron particles is apparently enhanced when the chemically stable parylene C layer was exited in the surface.
KeywordsSoft magnetic composites Magnetic properties Chemical corrosion resistance Eddy current loss
This research was supported by Science and Technique Foundation of He’nan Province (192102210033), Foundation of He’nan Educational Committee (17A430008), Doctor Research Foundation of Zhengzhou University of Light Industry (2014BSJJ022 and 2016BSJJ011), Key Laboratory of Advanced Manufacturing Technology, Ministry of Education (XDKFJJ07), and Open Foundation of Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education) of the Northeastern University (NEU-EPM-003).
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