锰锌铁氧体纳米粉体的烧结过程及其性能测试分析

Study on Sintering Process of Mn-Zn Ferrite Nanopowders and Its Sintered Properties

本文研究了锰锌铁氧体纳米粉体的烧结过程及晶粒生长规律,采用传统成型工艺和分段烧结方式,研究坯体的致密化和晶粒生长情况。分别采用阿基米德法、扫描电镜(SEM)和X射线衍射仪(XRD)对烧结体的密度、微观结构和相组成进行测试分析。烧结体的磁性能用振动样品磁强计(VSM)来测定。另外,根据[311]衍射峰的半高宽,利用Scherrer公式计算烧结体晶粒的大小。结果表明,在900℃烧结时,烧结体的密度达到了功率锰锌铁氧体材料所需的最佳密度,此时晶粒生长较好,得出900℃为Mn-Zn铁氧体纳米粉体的最佳烧结温度,此时烧结体的密度为4.8245g/cm3。

The segmented sintering process with different sintering temperature and grain growth of Mn-Zn ferrite nanopowders are investigated in this paper. The density, microstructure and phase composition of sintered compacts of Mn-Zn ferrite nanopowders were measured by Archimedes method, X-ray diffraction （XRD） and scanning electron microscopy （SEM）, respectively. The results show that the density of sintered compacts of Mn-Zn ferrite nanopowders increases with the rising of the sintering temperature. The compact sintered at 900℃ achieves the optimal density of Mn-Zn ferrite needed. The grain size can be estimated from the [311] peak by the Scherrer equation and it is 54. 9nm when sintered at 900℃. Additionally, from the fractured surface of sintered samples, it can be seen that the grains grow very well with small grain size and homogeneous distribution.