Preparation of FeNiMo/SiO<sub>2</sub> composite core and regulation of soft magnetic properties

Nowadays, metal soft magnetic materials are mainly used in electronic components such as high-frequency inductors. Since all the elements alloys transition metals, dense oxide layer is easily formed on their surfaces, which can affect regulation of properties. In order to solve problems, this work, an innovative high-temperature pretreatment process H<sub>2</sub>/Ar mixture adopted pretreat FeNiMo raw powders. We confirm that high temperature treatment reducing atmosphere effectively remove oxides from material surface and increase content elemental states, thereby further significantly improving effective permeability The pretreated powder evenly coated with SiO<sub>2</sub> layers, forming FeNiMo/SiO<sub>2</sub> composites. Compared untreated SiO<sub>2</sub>, gas at temperatures has low loss. Our cores prepared by synergistic effect insulation coating have more excellent properties than other iron-based Therefore, after being greatly improve reduce core loss This will provide a new strategy for enhancing composite cores.