Incorporation of the Fe3O4 and SiO2 nanoparticles in epoxy-modified silicone resin as the coating for soft magnetic composites with enhanced performance

• Published in: Journal of magnetism and magnetic materials 2018-04, Vol.452, p.5-9
• Main Authors: Luo, Dahao, Wu, Chen, Yan, Mi
• Format: Article
• Language: English
• Subjects: Core loss; Effective permeability; Inorganic-organic hybrid; Insulation coating; Soft magnetic composites
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2017.12.005

•SiO2 and/or Fe3O4 nanoparticles introduced to silicone resin as the coating of SMCs.•Morphology and composition of the hybrids revealed and correlated to the performance of SMCs.•Enhanced thermal, mechanical and magnetic properties achieved by addition of both SiO2 and Fe3O4.•Function of the SiO2 and Fe3O4 identified for improved performance of the SMCs. Three inorganic-organic hybrids have been designed by incorporating epoxy-modified silicone resin (ESR) with SiO2, Fe3O4 and their mixture in the application as the coating of Fe soft magnetic composites (SMCs). The introduced SiO2 nanoparticles are well dispersed in the ESR, while the Fe3O4 tends to agglomerate or even separate from the ESR. Simultaneous addition of the SiO2 and Fe3O4 gives rise to satisfactory distribution of both nanoparticles and optimized magnetic performance of the SMCs with high permeability (124.6) and low loss (807.8 mW/cm3). On one hand, introduction of the ferromagnetic Fe3O4 reduces the magnetic dilution effect, which is beneficial for improved magnetization and permeability. On the other hand, SiO2 incorporation prevents the agglomeration of the Fe3O4 nanoparticles and gives rise to increased electrical resistivity for reduced core loss as well as enhanced mechanical strength of the SMCs.