ALLOY MATERIAL FOR R-T-B TYPE RARE EARTH PERMANENT MAGNET, METHOD FOR PRODUCING R-T-B TYPE RARE EARTH PERMANENT MAGNET, AND MOTOR
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United States of America Patent
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Issued Date -
Apr 19, 2012
app pub date -
Jan 18, 2010
filing date -
Mar 31, 2009
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Abandoned
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Abstract
An excellent R-T-B type rare earth permanent magnet having a high coercive force (Hcj), in which a decrease in magnetization (Br) is suppressed, is obtained by a method for producing an R-T-B type rare earth permanent magnet using, as a raw material, an R-T-B type rare earth magnet alloy material including an R-T-B type alloy (wherein R is one kind, or two or more kinds selected from Nd, Pr, Dy and Tb, 4% by mass to 10% by mass of Dy or Tb being essentially contained in the R-T-B type alloy, T is metal containing essentially Fe, and B is boron) and a metal powder.
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