磷化工艺对铁基软磁复合材料电磁性能的影响

Effect of phosphating process on the magnetic and electrical properties of Fe-based soft magnetic composites

研究了磷化工艺对铁基软磁复合材料电磁性能的影响。XRD、SEM、EDS分析和元素面分布结果表明,合适的磷化工艺能在铁粉表面生成1层很薄的非晶或纳米晶结构磷酸盐,并且包覆完整均匀。磁性能测量结果表明,室温条件下用0.01g/mL磷酸对铁粉进行磷化30min,所得到的磷化铁粉磁芯具有优异的综合电磁性能。随着磷酸浓度的增大,磷化时间的增长和磷化温度的提高,软磁复合材料磁芯的电阻率增大,中高频磁损耗不断降低,同时磁导率也有一定程度的降低。

The effect of phosphating process on the magnetic and electrical properties of Fe-based soft magnetic composites （SMC） was studied. X-ray diffraction pattern, scanning electron microscopy, energy dispersive spectrometer analysis and distribution maps showed that the phosphate iron particles surface layer contains a thin layer of nanocrystalline or amorphous phosphate with high coverage of powders surface. Magnetic measurements showed that the phosphated iron samples has excellent comprehensive electromagnetic properties. The phosphating process was carried out by stirring the iron powders in the solution with 0.01g/mL phosphoric acid concentration at room temperature for 30min. With increase in the phosphoric acid concentration, phosphating time or temperature, specific resistivity increases, magnetic loss decreases significantly at medium and high frequencies and permeability also decreased by some extent.