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采用快淬法制备了镨基(Nd,Pr)10.5-x Dyx Fe83.5B6(x=0.0,0.5,1.0,1.5,2.0,2.5)系列粘结磁体,研究了Dy元素添加对快淬合金显微组织结构、磁性能及快淬薄带热稳定性的影响。与Nd2Fe14B相比,硬磁相Dy2Fe14B具有较高的磁晶各向异性场HA和较低的饱和磁极化强度Js,因此,Dy元素添加能显著提高合金的内禀矫顽力Hcj,但会降低合金的剩磁Br。Dy元素替代Nd/Pr元素,增强了快淬薄带的热稳定性,提高了晶化退火温度。较高的晶化退火温度,使快淬薄带中已经形成的微晶更容易长大,形成一些粗大晶粒,降低了粘结磁体的磁性能。1.0%是较佳的Dy元素添加量,(Nd,Pr)9.5Dy1Fe83.5B6合金快淬粘结磁体的最大磁能积(BH)max为71.6 k J/m3,剩磁Br为0.638 T,内禀矫顽力Hcj为611 k A/m。
Paste-based (Nd, Pr) 10.5-x DyxFe83.5B6 (x = 0.0,0.5,1.0,1.5,2.0,2.5) bonded magnets were prepared by the rapid quenching method. The effects of Dy addition on the microstructure of the quenched alloy Effect of micro-structure, magnetic properties and thermal stability of quenched ribbons. Compared with Nd2Fe14B, the hard magnetic phase Dy2Fe14B has a higher magnetocrystalline anisotropy field HA and a lower saturation magnetization Js, so Dy addition can significantly increase the alloy’s intrinsic coercivity Hcj, but it will decrease Residual magnetism Br. The Dy element replaces the Nd / Pr element, which enhances the thermal stability of the quenched ribbon and enhances the crystallization annealing temperature. The higher crystallization annealing temperature makes the already formed crystallites in the quenched ribbon grow more easily, forming some coarse grains and reducing the magnetic properties of the bonded magnets. (Nd, Pr) 9.5Dy1Fe83.5B6 alloy quenching bonded magnet maximum energy product (BH) max of 71.6 kJ / m3, the remanence Br of 0.638 T, the intrinsic viscosity The coercivity Hcj is 611 kA / m.