Fabrication of SmCo5 alloy via cobalt-induced calciothermic reduction and magnetic properties of its ribbon
来源期刊：JOURNAL OF RARE EARTHS2021年第5期
论文作者：Donghui Liu Fei Niu Xiaolin Zhang Yuning Meng Youming Yang
文章页码：572 - 578
摘 要：SmCo5 alloy was prepared via direct calciothermic reduction using anhydrous samarium fluoride（SmF3）as raw material and cobalt as inducer.Results of the thermodynamic calculation show that the direct reduction of cobalt-induced SmF3 for preparing SmCo5 alloy is feasible.An alloy with 33.89 wt%samarium and a yield of 96.45% were achieved under the optimal conditions of 10% and 20% excess of SmF3 and calcium over the stoichiometry,respectively,and 1450℃ for 4 min.The X-ray diffraction results show that the reduction products are SmCo5 alloy and CaF2.The scanning electron microscopy micrograph of the SmCo5 alloy ingot exhibits a distinct dendritic morphology composed of samarium and cobalt.The X-ray photoelectron spectroscopy shows that the atomic ratio of samarium to cobalt is approximately 1:5 and both elements demonstrate zero valency（Sm0,Co0）.The magnetic properties measurement of the SmCo5 alloy melt-spun ribbon shows the remanent magnetization Br=0.59 T,intrinsic coercivity HCi=345.82 kA/m and maximum magnetic energy density（BH）max=42.20 kJ/m3.These results may be helpful for the development of novel valence-variable rare-earth alloys.
Donghui Liu1，Fei Niu1,2，Xiaolin Zhang1，Yuning Meng1，Youming Yang1,2,3
1. Faculty of Materials,Metallurgy and Chemistry,Jiangxi University of Science and Technology2. Institute of Engineering Research,Jiangxi University of Science and Technology
摘 要：SmCo5 alloy was prepared via direct calciothermic reduction using anhydrous samarium fluoride（SmF3）as raw material and cobalt as inducer.Results of the thermodynamic calculation show that the direct reduction of cobalt-induced SmF3 for preparing SmCo5 alloy is feasible.An alloy with 33.89 wt%samarium and a yield of 96.45% were achieved under the optimal conditions of 10% and 20% excess of SmF3 and calcium over the stoichiometry,respectively,and 1450℃ for 4 min.The X-ray diffraction results show that the reduction products are SmCo5 alloy and CaF2.The scanning electron microscopy micrograph of the SmCo5 alloy ingot exhibits a distinct dendritic morphology composed of samarium and cobalt.The X-ray photoelectron spectroscopy shows that the atomic ratio of samarium to cobalt is approximately 1:5 and both elements demonstrate zero valency（Sm0,Co0）.The magnetic properties measurement of the SmCo5 alloy melt-spun ribbon shows the remanent magnetization Br=0.59 T,intrinsic coercivity HCi=345.82 kA/m and maximum magnetic energy density（BH）max=42.20 kJ/m3.These results may be helpful for the development of novel valence-variable rare-earth alloys.
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