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The magnetic properties,microstructure and magnetic hardening of sintered(Nd_(1-x)Dy_x)_(16)Fe_(77.2)B_(6.8) and Nd_(16)Fe_(77.2)B_(6.8)+ywt-%Dy_2O_3 magnets have been stud-ied.As an addition of Dy to the magnet during smelting,Dy atoms may enter thematrix phase Nd_2Fe_(14)B,so as to enhance H_A,refine grains and improve boundary struc-ture,as well as to increase H_(ci)of the magnet.If Dy_2O_3 is added to powder materialprior to sintering,Dy atoms diffuse into the epitaxial layer of grains of matrix phasecausing enhancement of K′_1,also refinement of grains and improvement of boundarystructure.The NdFeB based permanent magnets with higher H_(ci) and greater(BH)_mmay be produced by adding about 2—3 wt-% Dy_2O_3 which make a favourable conditionfor lower cost.
The magnetic properties, microstructure and magnetic hardening of sintered (Nd_ (1-x) Dy_x) (16) Fe_ (77.2) B_ (6.8) and Nd_ (16) Fe_ (77.2) B_ (6.8) + ywt_% Dy_2O_3 magnets have been stud -ied. As an addition of Dy to the magnet during smelting, Dy atoms may enter the matrix phase Nd_2Fe_ (14) B, so as to enhance H_A, refine grains and improve the boundary strucure, as well as to increase H_ (ci) of the magnet.If Dy 2 O 3 is added to the powder material prior to sintering, Dy atoms diffuse into the epitaxial layer of grains of matrix phasecausing enhancement of K’_1, also refinement of grains and improvement of boundar structure structure. NdFeB based permanent magnets with higher H_ (ci) and greater (BH) _mmay be produced by adding about 2-3 wt-% Dy_2O_3 which make a favorrable conditionfor lower cost.