预烧温度对用共沉淀法制备的高导锰锌铁氧体微结构和磁性能的影响

Effects of presintering temperature on microstructure and magnetic properties of high permeability MnZn ferrites prepared by co-precipitation technology

采用化学共沉淀法由锰锌铁氧体废料制备高导锰锌铁氧体,用X线衍射(XRD)、扫描电镜(SEM)和比表面分析(BET)等表征手段,分析预烧温度对样品微观结构及磁性能的影响。研究结果表明:随着预烧温度的升高,粉料比表面积减小,晶粒逐渐变大,晶形趋于完整;样环的初始磁导率随着预烧温度的升高先增大后减小;共沉淀粉料的最佳预烧温度为850℃,此时预烧粉晶形完整,颗粒粒径均匀一致,预烧样品经过气氛烧结后,可获得初始磁导率μi为13 000的铁氧体。

High permeability Mn-Zn ferrites were prepared from waste Mn-Zn ferrites by co-precipitation technology. The effects of presintering temperature on the sample＇s microstructure and magnetic properties were studied using XRD, SEM and BET as characterization method. The results show that with increase of the presintering temperature, the surface area of the powders reduces, the grains gradually become larger and the crystal structure tends to complete. The initial permeability of the ring increases at first then decreases as the presintering temperature increases. The optimal presintering temperature of the co-precipitation powders is 850 ℃, at this point the presintering powders have complete crystal structure and the particle size is uniform. The high permeability μi over 13 000 ferrites are obtained through atmosphere-control sintering.