| 摘要 |
PURPOSE:To prevent the components of magnetic material powder from segregating so as to obtain a soft ferrite magnetic material low in power loss by a method wherein hydrothermal synthetic powder is used as material powder. CONSTITUTION:Hydrothermal synthetic ferrite powder, which is 0.3 to 8mum in average grain diameter, equal in composition, so uniform in grain diameter and so optionally controlled in grain size as to make a figure obtained by dividing its standard deviation by average grain diameter smaller than 0.20 and to satisfy formulas, log (d10/d)>=-0.38 and log (d90/d)<=0.30, (d denotes average diameter of ferrite powder, and d10 and d90 represent diameters of ferrite powder which amounts to 1094 and 90% of total amount of ferrite powder in a grain diameter cumulative distribution), is used as soft ferrite magnetic material. By this setup, a soft ferrite magnetic material uniform in grain diameter, fine in crystalline structure, less segregated, small in number of voids, uniform in void distribution, and low in power loss can be obtained. |
