| 摘要 |
PURPOSE:To produce permanent magnet powder which can be sintered at a predetermined temperature or below without requiring hot press, provides no nucleus for producing reverse domains, having a smooth surface causing no damage on a die, and exhibiting high corrosion resistance under powder state. CONSTITUTION:The method for producing permanent magnet powder comprises a step for admixing granular Ca and an oxide powder of at least one element selected from Zn, Sn, Pb, and Bi, at a specified ratio, with a material magnet powder, and a step for heating the mixture in an inert gas atmosphere at a temperature range 300-1200 deg.C. Thermal reaction products are then treated with water or aqueous solution of weak acid thus producing permanent magnet powder wherein the surface of particle is covered with at least one kind of metal of Zn, Sn, Pb, or Bi. |
