| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a 2-17 based Sm-Co rare-earth permanent magnet for obtaining an anisotropic 2-17 based Sm-Co rare-earth permanent magnet sintered compact having high hardness, high coercive force and high energy product by giving higher density fine crystal grain/grain boundary structure while restraining the grain growth, and to provide a manufacturing device. SOLUTION: In this method for manufacturing the 2-17 based Sm-Co rare-earth permanent magnet, in processes of discharge plasma heating, pressuring, and sintering the 2-17 based Sm-Co rare-earth permanent magnet powder having a grain size of 0.01-1000 μm, a raw material ingot and a coarse powder in the stage of a raw material and a mean grain size 500 μm or more are subjected to homogenizing heat treatment of executing heating at 700 deg.C-1200 deg.C, and a powder-compressed molded body oriented in advance in 0.05T-10T DC and AC external magnetic fields is heated, pressured, and sintered by plasma at a temperature of 700-1200 deg.C. Consequently, since the crystal grain growth is restrained and high density fine crystal grain/grain boundary structure are realized, the anisotropic 2-17 based Sm-Co rare-earth permanent magnet sintered compact having high hardness, high coercive force and high energy product can be provided. |
