铁基软磁复合材料的SiO_(2)包覆研究进展

Research progress of SiO_(2)coating on iron-based soft magnetic composites

软磁复合材料在诸多领域有着重要的应用,随着技术的发展,对软磁复合材料的性能要求也在不断提高中。为了满足在高频率和高功率工况下的应用需求,需要开发低损耗、高磁导率的软磁复合材料。SiO_(2)作为绝缘包覆介质具有高电阻率和高热稳定性,能够通过多种方法包覆在磁粉颗粒上,因此在新型软磁复合材料开发领域得到广泛的应用。总结了溶胶凝胶法、化学液相沉积法、反相微乳法、化学气相沉积法、双层包覆法和改性树脂包覆法在铁基软磁复合材料的SiO_(2)绝缘包覆上的应用,归纳了上述各绝缘包覆方法的特点,并按其特点进行了分类,指出了当前SiO_(2)绝缘包覆面临的一些问题,并对未来绝缘包覆方法的发展进行了展望。

Soft magnetic composite materials have important applications in many fields.With the development of technology,the performance requirements of soft magnetic composite materials are constantly improving.In order to meet the application requirements of high frequency and high power working conditions,it is necessary to develop soft magnetic composites with low loss and high permeability.SiO_(2),as an insulating coating medium,has high resistivity and thermal stability,and can be coated on magnetic particles by a variety of methods,so it has been widely used in the field of developing new soft magnetic composites.This paper summarizes the application of sol-gel method,chemical liquid deposition method,reverse microemulsion method,chemical vapor deposition method,double-layer coating method and modified resin coating method in SiO_(2)insulation coating of iron-based soft magnetic composites.The characteristics of various insulating coating method are summarized and classified according to their characteristics.Some problems faced by SiO_(2)insulating coating at present are pointed out,and the development prospect of insulating coating methods is prospected.