Abstract
The effects of Zr additions on the Sm(Co,Fe,Cu,Zr)z compound have been studied. Melt-spun ribbons with a composition of Sm(Co0.68−xFe0.25Cu0.07Zrx)7.7 (x=0, 0.02, 0.04, 0.07, 0.10, and 0.15) were prepared with a wheel speed of 45 m/s, followed by a vacuum heat treatment in the temperature range of 650–800 °C for 5 min. X-ray diffraction (XRD) results showed that the as-spun ribbons of Sm(Co0.68−xFe0.25Cu0.07Zrx)7.7 have a primary TbCu7-type phase. When the annealing temperature was increased, grain sizes in the ribbons were increased according to reduced XRD peak widths of the TbCu7 phase. A Co23Zr6 compound was observed in the heat-treated ribbons when the Zr content exceeded 0.04. Saturation magnetization of the ribbons was linearly decreased from 95 to 45 emu/g (under a magnetic field H=18 kOe), while the Zr content was increased from 0 to 0.15. However, intrinsic coercivity of the ribbons was significantly dependent on grain size which was associated with both the Zr contents and heat-treatment temperatures. The highest intrinsic coercivity, Hci=13 kOe, was obtained in the ribbons with Zr content of 0.10 and heat treatment at 650 °C. With a maximum energy products up to 9.5 MGOe amd Br of 7.4 kG in the heat-treated ribbons with a suitable Zr addition is considered as promising magnets for high temperature applications.
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