R-T-B based sintered magnet
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United States of America Patent
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Apr 18, 2017
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app pub date -
Apr 22, 2014
filing date -
Apr 22, 2013
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Abstract
The present invention provides a permanent magnet with a coercivity that will not be significantly decreased and a light weight compared to conventional R-T-B based permanent magnets. A core-shell structure is formed for the major phase grain by adding Cu to the R-T-B based magnet which is the raw material. When the mass concentration of Y in the core portion is set as EY, the mass concentration of Y in the shell portion is set as LY and the mass concentration of Y in the R2—Fe14—B crystal grain calculated from the ratio R1:Y in the total composition is set as SY, the ratio α of EY to SY (EY/SY) is 1.1 or more. Thus, the magnetic insulation among the crystal grains becomes better which prevents the coercivity from decreasing due to the addition of Y. Further, the addition of Y makes the magnet lighter in weight.
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