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Author(s): |
Ji-bing Sun, School of Material Science & Engineering, Hebei University of Technology, Tianjin 300130, PR China
Chun-xiang Cui, School of Material Science & Engineering, Hebei University of Technology, Tianjin 300130, PR China
Li-guo Yang, School of Material Science & Engineering, Hebei University of Technology, Tianjin 300130, PR China
Wei Yang, School of Material Science & Engineering, Hebei University of Technology, Tianjin 300130, PR China |
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Abstract: |
In this paper, all as-cast alloys prepared by arc melting method and ribbons melt-spun at 40 m/s were studied by means of adding graphite or carbon nanotubes (CNTs) into the SmCo6.9Hf0.1 alloy. It was found that Hf addition can stabilize the TbCu7-type structure in the SmCo7 as-cast alloy, moreover, simultaneous addition of Hf and C or CNTs is more effective in stabilizing the TbCu7-type structure. The main phase in all ribbons is Sm(Co,Hf)7 no matter whether C or CNTs is added or not. The C and CNTs addition increased the coercivity of SmCo6.9Hf0.1 ribbons over one or two times, improved the remanence by 37.5% and 54.9% and increased the remanence ratio by 18.7% and 37.5% respectively. The magnetic properties of SmCo6.9Hf0.1(CNTs)0.05 ribbons reached Hc=12.5 kOe, Mr=57.0 emu/g, Mr/M2T=0.788. The higher content of Sm(Co,Hf)7 main phase, better crystallization anisotropy and smaller domain width can result in improving the magnetic properties of the ribbons.
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