球磨与共沉淀法制备MnZn铁氧体的对比研究

Comparison studies on MnZn ferrites prepared by ball milling and co-precipitation methods

分别采用高能球磨和化学共沉淀法制备了MnZn铁氧体,通过XRD、VSM和金相显微镜的分析,对两种铁氧体的预烧料粉末、烧结体的显微结构以及磁性能做了比较。结果表明:化学共沉淀法所制备的预烧料粉末具有晶粒细小、均匀和活性高等优点;与高能球磨法相比,化学共沉淀法烧结磁体的密度较高、晶粒尺寸较大,磁性能更为优良。其相应的磁性能参数Ms、Mr、Hc和μi分别为3.845×102kA/m,3.421kA/m,0.722kA/m和5500。

MnZn ferrites were prepared by methods of high-energy ball milling and chemical co-precipitation. Compared and analyzed were the pre-sintered powder, microstructures and magnetic properties of the two MnZn ferrites through XRD, VSM and metalloscope analysises. The results show that the pre-sintered powder prepared by chemical co-precipitation method has many merits, such as smaller grains, better uniform and higher activity. Compared to the sintered magnets prepared by the high-energy ball milling, the sintered magnets prepared by chemical co-precipitation method have bigger density, larger grain size and better magnetic properties. The magnetic property parameters of sintered magnet prepared by chemical co-precipitation method are： 3.845×10^2kA/m （Ms）, 3.421 kA/m （Mr）, 0.722 kA/m （He） and 5 500 （μi）, respectively.