| 摘要 |
PURPOSE:To obtain an R-B-Fe sintered magnet which has excellent magnetic characteristics by adding a specific fluoride to the R-B-Fe sintered magnet. CONSTITUTION:An R-B-Fe alloy powder wherein the essential components are R (at least one of rare earth elements which contain Y), B and Fe or the same component mixed powder is further mixed with at least one of rare earth element fluoride NdF3 or DyF3 and is formed, sintered and heat-treated. It is preferable that at least one of the rare earth element fluoride NdF3 or DyF3 is so mixed and added that 0.001-0.8 weight % of halogen element fluorine (F) is contained in a product after sintered and heat-treated. This improves magnetic characteristics such as residual magnetic flux density (Br), coercive force (iHc) or a maximum energy product {BH(MAX)}. |
