ALLOY MATERIAL FOR R-T-B SYSTEM RARE EARTH PERMANENT MAGNET, METHOD FOR PRODUCING R-T-B SYSTEM RARE EARTH PERMANENT MAGNET, AND MOTOR

摘要

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 are provided. In such an alloy material for an R-T-B system rare earth permanent magnet, a plurality of R-T-B system alloys having different compositions and a metal powder are included, 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 among the plurality of R-T-B system alloys contains 17 mass% or greater of Dy, and a Dy concentration difference between the first alloy and a second alloy having the least Dy concentration difference with respect to the first alloy among the plurality of R-T-B system alloys is 5 mass% or greater.