| 摘要 |
PURPOSE:To obtain anisotropic magnetic powder having high performance by coating the surface of the powder pulverized from magnetically anisotropic compact with rare earth metal by a sputtering method or a depositing method, and then heat-treating it at 250 deg.C of higher. CONSTITUTION:A compact is desirably formed in a quenched thin piece from alloy of rear earth element, iron and boron by a quenching thin stripe manufacturing apparatus, mechanically oriented by two-stage hot pressing method and subjected to magnetic anisotropy. The surface of powder pulverized from compact is coated with rare earth metal by a sputtering method or a depositing method, and then heat-treated at 250 deg.C or higher to alleviate its surface strain and to recover reduced coercive force. The coating may include one or more types of rare earth elements. The rare earth element magnet made of rare earth metal, iron and boron includes, in addition to Nd-Fe-B, Pr-Nd, Ce-Pr-Nd as the rare earth elements which can obtain sufficient magnetic performance, and coercive force iHc can be increased by adding a small amount of heavy rare earth element. |
