| 摘要 |
PURPOSE:To improve the magnetic property by controlling and specifying the width of particle accumulation distribution, average particle diameter and oxygen amount of sintered body in a rare-earth permanent magnet of which composition is R-Fe-B (R is one or more rare-earth elements containing Y). CONSTITUTION:The titled magnet is produced by sintering and applying heat treatment to the magnet powder which contains R (R is one or more rare-earth elements including Y), Fe and B, whereas the width d90-d10 (d10 is 10% particle diameter of particle accumulation distribution, and d90 is 90% thereof, respectively) is 6-10mum, an average particle diameter d50 is 2-10mum and the oxygen amount of sintered body is 4000-10000ppm, and then is produced by using a jet mill of clash rotation type. Thus, the product with high coercive force and maximum energy production can be obtained. |
