Bulk Isotropic and Anisotropic Nanocomposite Rare-Earth Magnets

Abstract

Bulk, isotropic and anisotropic nanocomposite magnets of (Nd,Pr,Dy)/sub x/Fe/sub 100-x-y-z-u-v/Co/sub y/Al/sub z/Ga/sub u/B/sub v/ 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)/sub max/ of 16.2 MGOe was obtained when hot pressing Nd/sub 9.3/Pr/sub 0.5/Dy/sub 0.2/Fe/sub 77.7/Co/sub 6.3/Al/sub 0.2/Ga/sub 0. /2B/sub 5.6/ at 660/spl deg/C. The magnetic performance of anisotropic nanocomposite magnets is strongly dependent on the rare-earth content and the hot deformation amount. The best (BH)/sub max/ of 42 MGOe was achieved in a hot-deformed Nd/sub 10.8/Pr/sub 0.6/Dy/sub 0.2/Fe/sub 76.1/Co/sub 6.3/Al/sub 0.2/Ga/sub 0 /./sub 2/B/sub 5.6/ magnet with 70% height reduction.