铁硅粉末粒径对磷化及温压工艺的影响

Effect of particle size on the phosphating and warm-pressing process of FeSi powder

对软磁铁硅金属粉末进行磷化处理得到钝化粉末,造粒之后进行温压压制,通过观察钝化粉的表面形貌以及测试压坯的物理特性,分析了粗细粉末配比对钝化结果以及压坯特性的影响,比较得到了最优的粗细粉末粒径配比组成。结果表明,等质量的软磁金属粉末进行钝化时,粒径较小的粉末需要更多的钝化溶液,否则钝化包覆效果不理想。通过测试造粒粉及压坯的各种特性发现,细粉与粗粉质量比为1∶3时,其特性表现最佳,即松装密度可达2.10 g/cm^3,流动性为61 s;压坯密度为5.24 g/cm^3,抗压强度为8.6 kg/cm^2,磁导率为28.5,品质因数为38,绝缘阻抗为74 M?。因此在实际生产过程中,可以将粗粉与细粉按照适当的比例进行混合,以获得最佳性能。

Passivation powder was obtained by phosphating soft magnetic silicon metal powder,and then warm compaction was carried out after granulation.By observing the surface morphology of passivated powder and testing the physical properties of compact,the influence of the ratio of coarse powder to fine powder on passivation results and compact properties was analyzed,and the optimum composition of coarse powder particle size was obtained by comparing.The results show that when the soft magnetic metal powder of equal mass is passivated,the powder with smaller particle size needs more passivation solution,otherwise the passivation coating effect is not ideal.By testing the properties of granulating powder and compact,it is found that for mass ratio of fine powder to coarse powder of 1:3,the best performance is obtained,featuring loose density of 2.10 g/cm^3 ,fluidity of 61 s,compact density of 5.24 g/cm^3 ,compressive strength of 8.6 kg/cm^2 ,permeability of 28.5,quality factor of 38,and insulation impedance of 74 MΩ.Therefore,in the actual production process,coarse powder and fine powder can be mixed in appropriate proportion to obtain the best performance.