The TEM shows lots of nano silica particles circumfuse on the surface of the micro Fe particles after the micro Fe coated by silica.

• 随着TEOS的投料的增加，材料饱和磁化强度呈下降趋势，微米粒子磁化曲线通过原点，表面包裹后，剩磁与矫顽力变化很小对于微米铁粉，其磁畴变化较快，没有剩磁与矫顽力。