R-T-B based permanent magnet
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United States of America Patent
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Sep 22, 2020
Grant Date -
Aug 31, 2017
app pub date -
Feb 23, 2017
filing date -
Feb 26, 2016
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Abstract
An R-T-B based permanent magnet includes main phase grains composed of R2T14B type compound. R is a rare earth element. T is iron group element(s) essentially including Fe or Fe and Co. B is boron. An average grain size of the main phase grains is 0.8 μm to 2.8 μm. The R-T-B based permanent magnet contains at least C and Ga in addition to R, T, and B. B is contained at 0.71 mass % to 0.86 mass %. C is contained at 0.13 mass % to 0.34 mass %. Ga is contained at 0.40 mass % to 1.80 mass %. A formula (1) of 0.14≤[C]/([B]+[C])≤0.30 is satisfied, where [B] is a B content represented by atom %, and [C] is a C content represented by atom %.
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