Annealing effects on magnetic properties of silicone-coated iron-based soft magnetic composites

作者：Wu, Shen; Sun, Aizhi^*; Zhai, Fuqiang; Wang, Jin; Zhang, Qian; Xu, Wenhuan; Logan, Philip; Volinsky, Alex A.

来源：Journal of Magnetism and Magnetic Materials, 2012, 324(5): 818-822.

DOI：10.1016/j.jmmm.2011.09.026

• Silicone resin
• Soft magnetic composites
• Annealing treatment
• Permeability

This paper focuses on novel iron-based soft magnetic composites synthesis utilizing high thermal stability silicone resin to coat iron powder. The effect of an annealing treatment on the magnetic properties of synthesized magnets was investigated. The coated silicone insulating layer was characterized by scanning electron microscopy and energy dispersive X-ray spectroscopy. Silicone uniformly coated the powder surface, resulting in a reduction of the imaginary part of the permeability, thereby increasing the electrical resistivity and the operating frequency of the synthesized magnets. The annealing treatment increased the initial permeability, the maximum permeability, and the magnetic induction, and decreased the coercivity. Annealing at 580 degrees C increased the maximum permeability by 72.5%. The result of annealing at 580 degrees C shows that the ferromagnetic resonance frequency increased from 2 kHz for conventional epoxy resin coated samples to 80 kHz for the silicone resin insulated composites.

• 出版日期2012-3
• 单位北京科技大学