Structure and permanent magnetic properties of SmFex (x=3-8) melt spun ribbons during heat treatment |
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作者姓名: | 罗阳 于敦波 李红卫 庄卫东 毛永军 陈晓霞 李扩社 刘宇超 |
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作者单位: | National Engineering Research Center for Rare Earth Materials,General Research Institute for Nonferrous Metals,Grirem Advanced Materials Co.,Ltd.,Bei-ring 100088,China |
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基金项目: | supported by the National High Technology Research and Development Program of China(863 Program)(2011AA03A402) |
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摘 要: | Compounds with the composition SmFex(x=3–8) were prepared by melt spun method at a velocity of 40 m/s and subsequent annealing at temperature between 600–1000 ℃. The crystal structures of the as-quenched and as annealed powders were investigated by XRD methods with following Rietveld analysis. The glass forming ability could be enhanced by the increase of Sm content to x≤5.Metastable Sm5Fe17-type structure existed when 3≤x≤5 and temperature was lower than 800 ℃. SmFe2-type structure could be stable up to 1000 ℃ when x〉3 and temperature was under 800 ℃. The content of SmFe2-type decreased with the increase of x value and increased with temperature lower than 800 ℃, from which SmFe2-type started to bring the transition to SmFe3-type. As for Sm5Fe17-type compounds with x=3.4, the highest coercivity of 33.6 kOe could be obtained under a velocity of 30 m/s and heat treated under 700 ℃×1h.
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关 键 词: | 热处理过程 结构 Rietveld分析 X射线衍射方法 属性 永磁 薄带 急冷 |
收稿时间: | 2014-01-16 |
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