| 摘要 |
PROBLEM TO BE SOLVED: To provide a method to add Co, Cu, Dy, etc. to rare earth alloy permanent magnetic powder material which can fully utilize the conventional rare earth material alloy with no change to it, achieving a high magnetic properties but causing neither generation of coarse grain growth nor reduction in coercive force when it is sintered later on. SOLUTION: This invention relates to production methods for rare earth alloy powder and for permanent magnets using the powder. For the rare earth alloy powder, the first alloy group is defined to contain 29-33 mass % of R (the rare earth element(s) containing at least one or more of rare earth elements, including Y), 0.8-1.2 mass % of B, a combination of 0.01-0.5 mass % of Ga and 0.01-2.0 mass % of Al added for compound effect, and remainder being Fe, and the second alloy group is defined to contain 29-33 mass % of R (the rare earth element(s) containing at least one or more of rare earth elements, including Y), a combination of 0.01-0.5 mass % of Ga and 0.01-2.0 mass % of Al added for compound effect, and remainder being Fe (A part of Fe can be replaced by Co and Cu). This invention features production methods for rare earth alloy powder mixed of the first and second alloy group powders and for permanent magnets using the powder. |
