LOW-B RARE EARTH MAGNET

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PROBLEM TO BE SOLVED : To provide a low-B rare earth magnet which brings about the effect of dramatically improving magnets in squareness ratio and heat resistance by the magnetic effect of three kinds of Cu-enriched phases at grain boundaries where the three kinds of Cu-enriched phases are formed at the grain boundaries by adding a blend of 0.3-0.8 at% of Cu and a proper amount of Co to a rare earth magnet, and the effect of recovering the shortage of B at such grain boundaries. SOLUTION : The present invention discloses a low-B rare earth magnet including R2T14B main phases, which comprises the following raw material components : R of 13.5-14.5 at%; B of 5.2-5.8 at%; Cu of 0.3-0.8 at%; Co of 0.3-3 at%; and the balance consisting of T and inevitable impurities, where R represents at least one rare earth element including Nd, and T represents an element mainly including Fe. A blend of 0.3-0.8 at% of Cu and a proper amount of Co is added to a rare earth magnet to form three kinds of Cu-enriched phases at grain boundaries, which achieves the magnetic effect of the three kinds of Cu-enriched phases at the grain boundaries and the effect of recovering the shortage of B at the grain boundaries and thus, brings about the effect of dramatically improving magnets in squareness ratio and heat resistance. SELECTED DRAWING : None COPYRIGHT : (C)2018, JPO&INPIT