采用固体粘结剂制备的铁硅铝磁粉心

Sendust cores prepared with solid binder

提出了一种采用无机固体粘结剂制备铁硅铝磁粉心的工艺,采用扫描电镜、LCR分析仪、B-H分析仪研究了氧化方式、绝缘介质添加量及热处理方式等因素对铁硅铝磁粉心性能的影响。结果表明,粉料氧化前需预热;绝缘介质含量增大会降低磁粉心的磁导率,功耗先降低而后升高;升高热处理温度,可显著提高有效磁导率、降低功耗,但温度过高,反而会恶化磁粉心的性能,最佳热处理温度为720～780℃;与氮气氛中热处理相比,在空气中热处理后铁硅铝磁粉心直流叠加特性更优。采用该工艺可制取高性能的铁硅铝磁粉心,且大大简化了现有生产工艺,更易实现规模化生产。

This paper puts forward a new method of preparation of sendust cores using inorganic binder. The effect of oxidation methods, amount of insulating medium and the way of heat treatment on the properties of sendust cores were researched by SEM, LCR analyzer and B-H analyzer. The results showed that powder needs pre-heating before oxidation. Increasing insulating medium leads to the decrease of permeability, while the power loss firstly deceases and then increases; Increasing heat treatment temperature can improve permeability and reduce the power loss. However too high heat treatment temperature can deteriorate the properties, The optimal heat treatment temperature is 720-780℃. DC bias characteristic of core heated in atmosphere is better compared with that heated in nitrogen. High performance sendust cores can be prepared using this process, and the technology greatly simplifies the production processes and is easy to achieve mass production.