| 简介 |
PROBLEM TO BE SOLVED : To provide a method for producing a rare earth magnet superior in both of a coercive force performance and a magnetization performance.
SOLUTION : A method for producing a rare earth magnet comprises the steps of : producing a sintered compact expressed by the compositional formula, (Rl)x(Rh)yTzBsMt (where Rl represents at least one light rare earth element including Y, Rh represents at least one heavy rare earth element of Dy and Tb, T represents a transition metal including at least one of Fe, Ni and Co, B represents boron, and M represents at least one of Ga, Al, Cu and Co; and x, y, z, s and t satisfy the following conditions : 27≤x≤44; 0≤y≤10; z=100-x-y-s-t; 0.75≤s≤3.4; and 0≤t≤3, provided that the figures are in mass%), and having a main phase of (RlRh)2T14B and a grain boundary phase in which the content of (RlRh)1.1T4B4 phase is in a range of more than 0 to 50 mass%; producing a rare earth magnet precursor by performing a hot plastic working on the sintered compact; and producing the rare earth magnet by performing an aging treatment on the rare earth magnet precursor under a temperature atmosphere of 450-700°C.
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