B掺杂对SmFe<sub>10</sub>Mo<sub>2</sub>合金的结构及磁性的影响*

doi:10.11901/1005.3093.2014.231

材料研究学报

2015, Vol. 29

Issue (1): 55-59 DOI: 10.11901/1005.3093.2014.231

本期目录 | 过刊浏览

B掺杂对SmFe₁₀Mo₂合金的结构及磁性的影响*

孙乃坤(

),杜胜杰,郭杰

沈阳理工大学理学院沈阳 110159

Effect of B-doping on Microstructure and Magnetic Properties of SmFe₁₀Mo₂ Alloy

Naikun SUN(

),Shengjie DU,Jie GUO

School of Science, Shenyang Ligong University, Shenyang 110159, China

引用本文:

孙乃坤,杜胜杰,郭杰. B掺杂对SmFe₁₀Mo₂合金的结构及磁性的影响*[J]. 材料研究学报, 2015, 29(1): 55-59.
Naikun SUN, Shengjie DU, Jie GUO. Effect of B-doping on Microstructure and Magnetic Properties of SmFe₁₀Mo₂ Alloy[J]. Chinese Journal of Materials Research, 2015, 29(1): 55-59.

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摘要:

用电弧熔炼法制备SmFe₁₀Mo₂及SmFe₁₀Mo_1.5B_0.5母合金锭, 将其均匀化退火后用球磨法制备SmFe₁₀Mo_1.5B_0.5纳米晶合金粉末, 研究了B掺杂对SmFe₁₀Mo₂块体合金和球磨对SmFe₁₀Mo_1.5B_0.5纳米粉末的相结构和磁性的影响。结果表明, B掺杂后合金的ThMn₁₂相结构不变, 居里温度由270℃提高到334℃; 合金成分不均匀导致热磁曲线出现两个相变点。SmFe₁₀Mo_1.5B_0.5合金经球磨处理0.5 h后Mo大量析出, 1∶12相明显减少; 随着球磨时间的增加α-Fe析出并形成非磁性的Mo₂FeB₂相, 使内禀矫顽力明显减小, 且其饱和磁化强度随着球磨时间的增加呈现先增大后减小的趋势。球磨0.5 h的纳米合金粉末永磁磁性能最佳: M_s=55Am²/kg, _iH_c=0.2T。

关键词 ：金属材料, 球磨处理, 相结构, 永磁性能, 居里温度

Abstract：

Ingots of SmFe₁₀Mo₂and SmFe₁₀Mo_1.5B_0.5 alloys were made by arc-melting method and followed by annealing treatment, with which nanocrystalline powders of the alloys were prepared by milling. While the effect of B-doping and ball milling on the phase composition and magnetic properties of the bulk and the nanocrystalline particles of SmFe₁₀Mo_1.5B_0.5alloy was investigated. It has been found that B-doping did not alter the crystallographic structure of the phase ThMn₁₂ in the alloy, but remarkably increased its Curie temperature from 270^oC to 334^oC. Due to the inhomogeneity of alloy compositions, correspondingly, in its thermal magnetic curve there exist two abrapt changes related with phase transformation . The post ball milling process could induce the occurrence of precipitates of Mo and α-Fe, which in turn reduce the amount of the ThMn₁₂ phase and promote the formation an non magnetic phase of Mo₂FeB₂. As a result, with the progress of ball milling process the intrinsic coercive force decreased and the saturation magnetization increased first and then decreased of the SmFe₁₀Mo_1.5B_0.5 powders. However, the nanocrystalline particles of SmFe₁₀Mo_1.5B_0.5 alloy milled for 0.5h exhibit optimal magnetic properties: _iH_c=2.2kOe and M_s=4.3kGs.

Key words： metallic materials ball milling phase structure permanent magnetic properties Curie temperature

收稿日期: 2014-05-07

基金资助:* 辽宁省自然科学基金2013020105和沈阳市科技计划F13-316-1-39项目资助。

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https://www.cjmr.org/CN/10.11901/1005.3093.2014.231 或 https://www.cjmr.org/CN/Y2015/V29/I1/55

图1 SmFe10Mo2块体、SmFe10Mo1.5B0.5块体、SmFe10Mo1.5B0.5球磨0.5h、SmFe10Mo1.5B0.5球磨1 h、 SmFe10Mo1.5B0.5球磨2 h以及SmFe10Mo1.5B0.5球磨3 h合金粉末的X射线衍射图谱

图2 SmFe10Mo1.5B0.5球磨0.5 h和2 h合金粉末的SEM图

图3 SmFe10Mo2块体、SmFe10Mo1.5B0.5块体以及SmFe10Mo1.5B0.5球磨0.5 h粉末的热磁曲线

图4 B掺杂前后合金的退磁曲线、不同球磨时间SmFe10Mo1.5B0.5合金粉末的退磁曲线以及磁性与球磨时间的关系

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