Effects of the Substitution of Mischmetal for PrNd on the Microstructures and Magnetic Properties of Rapidly Quenched (MM)PrNd-Fe-B Nanocrystalline Magnets

Abstract

Mischmetal of Bayan Obo ore was utilized to prepare the high performance (Pr 7.34 Nd 21.86 ) 1-x MM x Fe 68.7 Al 0.1 -Cu 0.12 Co 0.88 B ribbons using melt-spinning method. Phase composition and magnetic properties were investigated at room temperature. The ribbons mainly consist of R 2 Fe 14 B phase in isotropic nanostructure. Both coercivity and maximum energy product decrease with the increase of MM content. The magnetic parameters of the ribbons with MM = 20 % in mass are B r = 7.38 kGs, H cj = 13.66 kOe, (BH) max = 11.81 MGOe. Henkel plots were applied to demonstrate the exchange coupling interaction between grains.