高能球磨对雾化磁粉结构与磁性能的影响

Influence of high-energy milling on the structure and magnetic properties of atomized magnetic powder

采用高能球磨的方法处理水雾化Fe-Si-Al软磁合金粉末，运用SEM、XRD分析球磨粉末的显微结构和晶体结构，测试粉末的静磁参数及其2～18GHz范围的复磁导率（μr=μ′-jμ″）。结果表明，球磨时间增加，粉末的扁平率增大、粒度减小；平均晶粒尺寸减小、内应变增大导致结晶有序度降低；粉末的饱和磁感应强度减小、矫顽力增大；球磨粉末的复磁导率实部和自然共振频率均相应提高，但过度球磨不利于材料磁损耗性能的提高。

The water atomized Fe-Si-A1 soft magnetic alloy powder was milled by high-energy milling method. The microstructure and crystal structure of the powder milled for different time were investigated using SEM and XRD, and which static magnetic parameters and complex permeability （μr =μ′-jμ″） within 2- 18GHz were measured. With the increase of milling time,the aspect ratio of the milled powder increases while particle size decreases;the average grain size decreases while internal strain increases, resulting in a reduction of crystal degree of order;the saturation flux density decreases while the coercive force increases; the real part of complex permeability and natural resonance frequency improves simultaneously, however overmilling is unfavorable to further enhance the magnetic loss.