| 简介 |
PROBLEM TO BE SOLVED : To provide an RFeB based magnet high in coercive force by performing a grain boundary diffusion process with a RH-containing substance, and a manufacturing method thereof.
SOLUTION : A method for manufacturing an RFeB based magnet comprises : a deposition step of depositing a deposited material including a RHCuAl alloy including a heavy rare earth RCH including one or more kinds of heavy rare earth element RH, Cu, and Al, and having a composition represented by a point within an octagon having apices of eight-point coordinates (RCHat%, Cuat%, Alat%)=(50, 40, 10), (58, 30, 12), (58, 20, 22), (48, 20, 32), (33, 24, 43), (17, 50, 33), (17, 60, 23), (33, 58, 9) or on a side thereof in a ternary composition diagram drawn with apices of RCH, Cu and Al, on the surface of a substrate composed of a magnet body including a light rare earth RCL including one or more kinds of light rare earth element RCL, Fe and B, and sintered or produced by hot plastic processing; and a step of heating the substrate to a temperature at which RCH atoms in the deposited material are diffused into the substrate through grain boundaries.
SELECTED DRAWING : Figure 1
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