Abstract
Sm(Co 0.6Fe 0.27Cu 0.1Zr 0.03) 7.5 ribbons were prepared by melt-spun method. The results showed that the remnant magnetization M r and intrinsic coercivity H ci had a rapid increase when the heating rate increased from 5 to 10 °C/min. But the increase of M r and H ci were observed to be very little when the heating rate was further increased to 20 °C/min. 10 °C/min was the critical heating rate for obtaining high magnetic properties. The maximum values of M r and H ci reached 0.70 T and 780.1 kA/m when the annealing temperature and annealing time were optimized to be 800 °C and 1 h, respectively. Proper second-step heat treatment could suppress the decrease of H ci when the cooling rate increased from 0.7 to 5 °C/min, which could reduce the cooling time effectively.
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