Alloy material for R-T-B system rare earth permanent magnet, method for producing R-T-B system rare earth permanent magnet, and motor
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United States of America Patent
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Mar 21, 2017
Grant Date -
Oct 10, 2013
app pub date -
Sep 2, 2011
filing date -
Sep 30, 2010
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Abstract
An alloy material for an R-T-B system rare earth permanent magnet having a high orientation rate and high coercivity (Hcj), and a method for producing an R-T-B system rare earth permanent magnet using the alloy material. The alloy material includes a plurality of R-T-B system alloys having different compositions and a metal powder. The respective R-T-B system alloys are formed of R which is composed of two or more kinds selected from rare earth elements, T which is composed of a transition metal essentially containing Fe, B, and unavoidable impurities. A first alloy having the greatest Dy content contains 17 mass % or greater of Dy, and a Dy concentration difference between the first alloy and a second alloy having the smallest Dy concentration difference with respect to the first alloy among the plurality of R-T-B system alloys is 5 mass % or greater.
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