气水组合雾化制备FeSiCr合金软磁粉末形貌与性能研究

Effect of sphericity on soft magnetic properties of FeSiCr alloy powders

采用改进的新型组合雾化技术制备高球形FeSiCr软磁合金粉末,分别筛分合批制成D_(50)为10、12.5、15和21μm的样品;同时采用常规组合雾化技术制备相同D_(50)粒径的FeSiCr软磁合金粉末作为对照组。利用比表面及孔径分析仪,扫描电子显微镜对两种工艺粉末的形貌进行测量观察,并利用软磁交流设备对FeSiCr软磁粉末的磁性能进行表征。结果表明,新型组合雾化FeSiCr合金粉末形貌明显趋于球形化,同粒径粉末比表面积值明显低于常规组合雾化粉。两种雾化工艺均生成了bcc结构的α-Fe(Cr、Si)固溶体粉末;同粒径新型组合雾化粉末的有效磁导率μ_(e)低于常规组合雾化粉末,而直流偏置特性和磁损耗均优于常规雾化,其中在100 kHz、50 mT条件下D_(50)为10μm的磁芯P_(cv)只有601.8 mW/cm^(3)。

The high spherical FeSiCr soft magnetic alloy powder was prepared by the improved combined atomization technology,and the D_(50)is 10μm、12.5μm、15μm and 21μm sample.At the same time,FeSiCr soft magnetic alloy powder with the same D_(50)particle size was prepared by conventional combined atomization technology as the control group.The morphologies of the two process powders were measured and observed by means of specific surface and pore size analyzer and scanning electron microscope,and the magnetic properties of FeSiCr soft magnetic powder were characterized by soft magnetic AC equipment.The results show that the morphology of the new combined atomized FeSiCr alloy powder tends to be spherical obviously,and the specific surface area of the powder with the same particle size is significantly lower than that of the conventional combined atomized powder.Both atomization processes produce bcc structure aα-Fe(Cr,Si)solid solution powder.Effective permeability of new combined atomized powder with the same particle sizeμ_(e)is lower than the conventional combined atomization powder,while the DC bias characteristic and magnetic loss are better than the conventional atomization,and the P_(cv)of X10 at 100 kHz and 50 mT is only 601.8 mW/cm^(3).