| 摘要 |
PURPOSE:To obtain magnet powder having high magnetic characteristic by executing heat treatment and de-hydrogen treatment under the prescribed conditions to powder obtained by mixing hydride powder of one or more kinds of rare earth elements (R) containing Y, ferro boron powder and iron powder at the prescribed ratios. CONSTITUTION:By atomic %, 10-30% hydride powder of R, 3-30% ferro boron powder and the balance the iron powder are blended to obtain the mixed powder having 0.5-100mum average particle size. The heat treatment is executed at 500-1,100 deg.C under atmosphere of hydrogen gas or mixed gas of the hydrogen gas and inert gas to this powder. Successively, the de-hydrogen treatment is executed at 500-1,000 deg.C, and after making vacuum atmosphere at <=1Torr hydrogen gas pressure or inert gas atmosphere at <=1Torr hydrogen gas partial pressure, this powder is cooled. |
