| abstract |
An alloy produced by strip casting in the production of an R-T-MB-based sintered magnet tends to generate ultrafine powder containing a large amount of rare earth-rich phase in the pulverization process. Since the fine powder containing much is easy to oxidize, it has caused the magnet characteristics to deteriorate. Each process of hydrogen treatment, milling, and molding is performed in an inert gas or nitrogen gas atmosphere. In the milling process, oxygen is not added and fine powder containing a large amount of rare earth is not removed, and R is Sc. And at least one rare earth element selected from Y, T is at least one element selected from Fe and Co, M is Ti, Ni, Nb, Al, V, Mn, Sn, Ca, At least one element selected from the group of Mg, Pb, Sb, Zn, Si, Zr, Cr, Cu, Ga, Mo, W, and Ta, B is boron, and the weight composition ratio of each element is 29. % ≰R≰35%, 62% ≰T≰70%, 0.1% ≰M≰1.8%, 0.9% ≰B≰1.2%, oxygen content weight is 0.07% or less . [Selection figure] None |