| Abstract: | Melt-spun ribbons with composition Sm2+Y(Co0.8Fe0.1Mn0.1)17BX (X=0–1.0 and Y=0–0.2) were fabricated with a wheel speed of 50 m/s, followed by annealing in the temperature range of 500–800°C for 2.5–60 min. Our results show that all the ribbons annealed up to 800°C are composed of a TbCu7-type phase as the main phase. The highest coercivity of 8.7 kOe is obtained in a Sm-rich sample with composition Sm2.2(Co0.8Fe0.1Mn0.1)17 annealed at 750°C for 5 min. It is found that these magnets show a very promising high-temperature performance – much better than those of typical sintered 2 : 17 magnets. |
