| 摘要 |
PURPOSE:To obtain the title bond magnet in high residual flux density by a method wherein alloy particles mainly comprising Fe3B type component containing Nd2Fe14B type crystalline structure are produced from Fe-Ni-B-(R, Dy) base alloy molten in specific composition containing less rare earth element to be coupled with a resin. CONSTITUTION:The molten of an alloy having range limiting symbols in a composition formula or Fe100-x-y-zNixBycR1-aDya)z (where R: one or two kinds of R or Nd) meeting the following values i.e., 0.01<=x<=2at%, 16<=y<=22at%, 3<=z<=5.5at%, 0.02<=a<=0.7 is made into amorphous composition by super- quenching step to produce alloy particles. This alloy particles wherein boride phase mainly comprising Fe in body-centered tetragonal system Fe3P type crystalline structure and Nd2Fe14B type crystalline structure coexist in the same particles and the mean crystalline particle diameter of 5nm-100nm and the mean particle diameter of 3mum-500mum are coupled with a resin to obtain the title bond magnet having the magnetic characteristics of iHc>=4kOe, Br>=5kG, (BH)max>=3MGOe. |
