Abstract
SmCo 7, SmCo 6.9Hf 0.1, SmCo 6.9Hf 0.1(CNTs) 0.05 and SmCo 6.9Hf 0.1(CNTs) 0.1 melt-spun ribbons are prepared at a speed of 40 m/s. The phase structure, magnetic transformation and thermal stability of the ribbons are studied using thermal analysis, high temperature in-situ XRD and thermomagnetic analysis. The results show the Hf and CNTs (carbon nanotubes) additions have no influence on the formation of TbCu 7-type structure. Nevertheless, Hf addition may cause large heat storage; CNTs addition can lead to crystal-boundary blocking effect. The M– T curves of SmCo 7 matrix ribbons can all be divided into seven stages. The 1:7H decomposition, CoC x precipitation and 1:5 phase decrease successively emerge when the temperature increases from room temperature to 1100 °C.
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