Abstract:
PROBLEM TO BE SOLVED: To provide a thin shape R-T-B-M-C-based sintered magnet easy to be manufactured while maintaining a magnet performance and capable of efficiently using a permanent magnet material using rare earths which are precious resources, and to provide its manufacturing method and further manufacturing device for the magnet.SOLUTION: In a filling process for filling a lubricant at a predetermined filling density to an R-T-B-M-C-based alloy powder and an orientation process for orientating the cavity by a magnetic field under a predetermined pressure, the lubricant is 0.05 mass% to 2 mass%, and a pressing force when orientating in the orientation process is 0.2 to 2 MPa.
Abstract:
PROBLEM TO BE SOLVED: To produce a high-residual magnetic flux density, high-coercive force rare earth permanent magnet that is greatly improved in coercive force basically without any decrease in residual magnetic flux density, can be mass-produced, and is large-sized. SOLUTION: A method of manufacturing an R-T-B-based rare earth permanent magnet material is characterized in that after a step to manufacture sintered bodies R1-T-B-M1, the sintered bodies are embedded into a mixed powder consisting of one or more kinds of components of HR2M2 and R3 oxide, R4 fluoride and R5 oxyfluoride, and absorption is conducted in vacuum or inactive gas at a temperature equal to or less than the sintering temperature of magnets for 1-20 hours. Here, R1, R3, R4, and R5 are at least one among rare earth elements, T at least one between Fe and Co, B a fluorine, M1 at least one among Ti, Zr, Hf, V, Ta, etc., HR2 at least one kind among Dy, Ho and Tb, and M2 at least one of element among Al, Cu, Co, Ni, Mn, etc. COPYRIGHT: (C)2011,JPO&INPIT