Bulk isotropic and anisotropic nanocomposite rare-earth magnets

Bulk, isotropic and anisotropic nanocomposite magnets of (Nd,Pr,Dy)(x)Fe100-x-y-z-u-vCoyAlzGauBv with x = 8-11.6, y = 6-6.3, z = 0-0.2, u = 0-0.2, and v = 5.6-10.0 were prepared and their magnetic properties as functions of rare-earth content, hot press temperature, and hot-deformation amount were investigated. For isotropic nanocomposite magnets, the best (BH)(max) of 16.2 MGOe was obtained when hot pressing Nd9.3Pr0.5Dy0.2Fe77.7Co6.3Al0.2Ga0.2B5.6, at 660 degreesC. The magnetic performance of anisotropic nanocomposite magnets is strongly dependent on the rare-earth content and the hot deformation amount. The best (BH)(max) of 42 MGOe was achieved in a hot-deformed Nd10.8Pr0.6Dy0.2Fe76.1Co6.3Al0.2Ga0.2B5.6 magnet with 70% height reduction.