METHOD FOR MANUFACTURING GRAIN BOUNDARY DIFFUSION TREATMENT AGENT, AND METHOD FOR MANUFACTURING RAR

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PROBLEM TO BE SOLVED : To provide a method for effectively using a product resulting from a grain boundary diffusion treatment, an RFeB based magnet shaping or the like in manufacturing the RFeB based magnet. SOLUTION : A grain boundary diffusion treatment agent is manufactured by a method which has a content-of-heavy rare earth element increasing step for increasing the content of a heavy rare earth element RH in R to 15 mass% or more by performing a treatment for removing part of a light rare earth element RL from a product. The product is produced when manufacturing an RFeB based magnet including rare earth elements R, Fe and B, and has rare earth elements R including the heavy rare earth element RH including at least one element selected from Tb, Dy and Ho, and the light rare earth element RL including at least one element selected from Nd and Pr, of which the in-R content showing a proportion of the rare earth elements R that the heavy rare earth element RH accounts for is less than 15 mass%. The grain boundary diffusion treatment agent thus obtained is deposited to a surface of a base material composed of an RFeB based magnet sintered compact, or a magnet body produced by hot plastic processing and then, heated at a predetermined temperature, whereby the RFeB based magnet with a high coercive force can be manufactured. SELECTED DRAWING : Figure 2 COPYRIGHT : (C)2017, JPO&INPIT