| 摘要 |
PURPOSE:To provide a manufacturing method which enables easy manufacture or magnet powder of fine crystal which can acquire coercive force of 6 kOe or more and manufactures permanent magnet powder whose following handling is easy by obtaining a composition replacing R-T nitride. CONSTITUTION:Heating treatment in H2 gas alone or in a mixture air with inert gas (excepting N2 gas) and de-H2 treatment for heating and holding in specified atmosphere are performed for coarsely crushed powder which mainly consists of T, contains at least Pr or Nd as R, contains at least one kind of Ti, V, Cr, Mo as well as C and is formed to required composition. It is possible to form a powder body having aggregate structure of average crystal grain diameter of 0.05 to 0.5mum as it is coasely crushed powder of required average grain size, to enable extremely easy handling of powder in a following process and to acquire a magnet of high coercive force by magnetizing it by following nitrization treatment. |
