摘要
Five kinds of bonded magnets with compositions of Nd(10.5)Fe(78.4-x)Co(5)Zr(x)B(6.1) (atom percentage x = 0, 1.0, 1.5, 2.0, 2.5) were prepared by rapid quenching, post heat treatment and mould-pressing. The microstructure and crystallization behavior were studied by X-ray diffraction (XRD), differential thermal analysis (DTA) and atomic force microscopy (AFM). The results suggest that high content of Zr can increase the glass formation ability (GFA) of alloys. When the content of Zr is controlled at a certain level, Fe,Zr with high melting point is formed in the alloys, and grain size is reduced consequently. At the same time, because of Zr addition, the coercivity and squareness of demagnetization loop are obviously improved, and the energy product is accordingly increased. As a result, optimal magnetic properties of Nd(10.5)Fe(78.4-x)Co(5)Zr(x)B(6.1) (B(t) = 0. 659 T, H(cj) = 628 kA center dot m(-1), H(cb) = 419 kA center dot m(-1) (BH)(m) 73 kJ center dot m(-3)) are obtained when x = 2.
Five kinds of bonded magnets with compositions of Nd(10.5)Fe(78.4-x)Co(5)Zr(x)B(6.1) (atom percentage x = 0, 1.0, 1.5, 2.0, 2.5) were prepared by rapid quenching, post heat treatment and mould-pressing. The microstructure and crystallization behavior were studied by X-ray diffraction (XRD), differential thermal analysis (DTA) and atomic force microscopy (AFM). The results suggest that high content of Zr can increase the glass formation ability (GFA) of alloys. When the content of Zr is controlled at a certain level, Fe,Zr with high melting point is formed in the alloys, and grain size is reduced consequently. At the same time, because of Zr addition, the coercivity and squareness of demagnetization loop are obviously improved, and the energy product is accordingly increased. As a result, optimal magnetic properties of Nd(10.5)Fe(78.4-x)Co(5)Zr(x)B(6.1) (B(t) = 0. 659 T, H(cj) = 628 kA center dot m(-1), H(cb) = 419 kA center dot m(-1) (BH)(m) 73 kJ center dot m(-3)) are obtained when x = 2.
基金
ProjectsupportedbytheNational863Program(2001AA324030)
