不同类型电磁加热用磁条材料的成分、结构与性能对比分析

通过电子探针(EPMA)、扫描电镜(SEM)、X射线衍射(XRD)、综合物性测量系统(PPMS)、软磁测量装置(MATS-2010SA、MATS-2010SD),分析并对比了电磁炉厂商使用的不同类型锰锌铁氧体磁条材料在化学成分、显微结构和磁性能上的差异,从材料学的角度揭示了电磁炉能效出现波动的原因。结果表明,不同供应商、不同类型的锰锌铁氧体磁条在化学成分、微观形貌和磁性能上差别较大。不同磁条的Mn与Zn的原子比处在1.21~3.90之间,在二次料生产的磁条中添加了较多的Ca、Si等元素。一次料制备的锰锌铁氧体磁条材料晶粒大小均匀、气孔率低,磁性能明显优于二次料磁条,而一次料磁条之间差别不明显。不同磁条的化学成分和显微结构上的差别导致性能出现波动,从而对电磁炉能效造成影响。

Comparative study on the composition,structure and properties of different types of magnetic strips for electromagnetic heating

The differences in chemical composition, microstructure and magnetic properties of different types of Mn-Zn ferrite bar magnet materials were analyzed and compared by electron probe microanalysis (EPMA), scanning electron microscopy (SEM), X-ray diffraction (XRD), comprehensive physical property measurement system (PPMS), soft magnetic measuring device (MATS-2010SA, MATS-2010SD), respectively. The reasons for energy efficiency instability in the induction cooker were revealed from the perspective of material science. The results indicate that different types of Mn-Zn ferrite bar magnet from different suppliers have a large difference in chemical composition, microstructure and magnetic properties. The Mn and Zn atomic ratio of different bar magnet materials is between 1.21 and 3.90. Secondary materials bar magnet contains more Ca, Si and other elements. Due to its uniform grain size and low porosity, Mn-Zn ferrites bar magnet prepared from primary material have better magnetic properties than those from secondary material, but the differences among the primary material bar magnet were not obvious. Differences in the chemical composition and microstructure of the different bar magnet lead to fluctuations in the performance, which has impact on energy efficiency of the induction cooker.