SINTERED R-TM-B MAGNET
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United States of America Patent
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Mar 22, 2016
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Mar 27, 2015
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Abstract
A sintered R-TM-B magnet comprising 24.5-34.5% by mass of R, which is at least one selected from rare earth elements including Y, 0.85-1.15% by mass of B, less than 0.1% by mass of Co, 0.07-0.5% by mass of Ga, and 0-0.4% by mass of Cu, the balance being Fe and inevitable impurities; the amounts (% by mass) of Ga and Cu being in a region of a pentagon defined by a point A (0.5, 0.0), a point B (0.5, 0.4), a point C (0.07, 0.4), a point D (0.07, 0.1) and a point E (0.2, 0.0), on an X-Y plane in which the X-axis represents the amount of Ga, and the Y-axis represents the amount of Cu.
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