Abstract In this study, an organic/inorganic composite coating method based on silane, silicon oil, and tetraethyl orthosilicate was developed to prepare Fe–Si–Al soft magnetic composites (SMCs). The insulation reaction processes may have involved the hydroxylation of magnetic powder and condensation of silanol groups. Analyses of the microstructure and high frequency stability of the effective permeability of the SMCs demonstrated the formation of a high-quality silicon oxide coating layer on the surfaces of the Fe–Si–Al particles. The effects of the insulation content on the density, resistivity, and magnetic properties were studied for the well-insulated Fe–Si–Al SMCs, and the underlying physical mechanisms were clarified. The results showed that increasing the insulation content reduced the effective permeability and the eddy current loss, but increased the DC-bias performance and hysteresis loss. The enhancement of the effective demagnetizing field indicated by the decrease in the density of the SMCs may have been responsible for the enhanced hysteresis. In addition, the increase in the resistivity of the SMCs may have contributed to the decrease in the eddy current.

中文翻译：

---

通过硅烷辅助有机/无机复合涂层路线合成绝缘良好的 Fe-Si-Al 软磁复合材料

摘要 本研究开发了一种基于硅烷、硅油和原硅酸四乙酯的有机/无机复合涂层方法来制备 Fe-Si-Al 软磁复合材料 (SMCs)。绝缘反应过程可能涉及磁粉的羟基化和硅烷醇基团的缩合。SMC 有效磁导率的微观结构和高频稳定性分析表明，在 Fe-Si-Al 颗粒表面形成了高质量的氧化硅涂层。研究了绝缘含量对绝缘良好的 Fe-Si-Al SMC 的密度、电阻率和磁性能的影响，并阐明了潜在的物理机制。结果表明，增加绝缘含量降低了有效磁导率和涡流损耗，但增加了直流偏置性能和磁滞损耗。SMC 密度的降低表明有效退磁场的增强可能是磁滞增强的原因。此外，SMC 电阻率的增加可能有助于涡流的减少。