吸放氢处理对La0.6Pr0.4Fe11.4Si1.6B0.2合金磁热效应的影响*

doi:10.11901/1005.3093.2015.004

材料研究学报

2015, Vol. 29

Issue (11): 829-834 DOI: 10.11901/1005.3093.2015.004

本期目录 | 过刊浏览

吸放氢处理对La_0.6Pr_0.4Fe_11.4Si_1.6B_0.2合金磁热效应的影响*

张涛^1,^2,³(

),刘翠兰²,张勇³

1. 内蒙古包钢稀土(集团)高科技股份有限公司生产部包头 014030
2. 包头稀土研究院包头 014030
3. 北京科技大学新金属材料国家重点实验室北京 100083

Influence of Hydrogen Absorption and Desorption on Magnetocaloric Effect of La_0.6Pr_0.4Fe_11.4Si_1.6B_0.2 Alloy

Tao ZHANG^1,^2,^3,^**(

),Cuilan LIU²,Yong ZHANG³

1. Inner Mongolia Baotou Steel Rare-earth (Group) Hi-tech Co., Ltd. Baotou 014030, China
2. Baotou Research Institute of Rare Earth, Inner Mongolia, Baotou 014030, China
3. State Key Laboratory for Advanced Metals and Materials, University of Science and
Technology Beijing, Beijing 100083, China

引用本文:

张涛,刘翠兰,张勇. 吸放氢处理对La_0.6Pr_0.4Fe_11.4Si_1.6B_0.2合金磁热效应的影响*[J]. 材料研究学报, 2015, 29(11): 829-834.
Tao ZHANG, Cuilan LIU, Yong ZHANG. Influence of Hydrogen Absorption and Desorption on Magnetocaloric Effect of La_0.6Pr_0.4Fe_11.4Si_1.6B_0.2 Alloy[J]. Chinese Journal of Materials Research, 2015, 29(11): 829-834.

全文: PDF(875 KB) HTML

摘要:

使用工业纯度原材料制备出La_0.6Pr_0.4Fe_11.4Si_1.6B_0.2合金, 用XRD和VSM分析了合金的析出相、居里温度和磁热性能, 研究了吸氢放氢处理对合金磁热性能的影响。结果表明:退火合金经0.13和0.2 MPa吸氢处理后居里温度分别达到320和321 K, 吸氢压力高的样品放氢困难; 经0.13 MPa吸氢样品在473 K放氢后居里温度降低到室温范围。放氢导致氢化物最大磁熵变降低和相对制冷能力RCP的提高。

关键词 ：金属材料, 磁性材料, 磁热性能, 放氢, 稳定性, 居里温度

Abstract：

The La_0.6Pr_0.4Fe_11.4Si_1.6B_0.2 alloy was produced by using industrial grade raw materials. The phase constituents and thermal magnetic properties of the alloy were characterized by X-ray diffraction with Cu kα radiation and vibration sample magnetism respectively. The influence of hydrogen absorption pressure on magnetocaloric effect and hydrogen desorption process were investigated. Results show that the annealing treated alloy was subjected to hydrogenation at 0.13 and 0.2 MPa, correspondingly its Curie temperature increased to 320 and 321 K respectively. The taking place of dehydrogenation was much easier for the alloy hydrogenated at lower absorption pressure rather than that at higher pressure. The Curie temperature of the alloy hydrogenated at 0.13 MPa and then dehydrogenated at 473K could lower to room temperature range, correpondingly the maximal magnetic entropy of the hydrides decreased while the relative cooling power were increased.

Key words： metallic materials magnetic materials magnetocaloric properties hydrogen desorption stability Curie temperature

收稿日期: 2015-01-05

基金资助:*国家高技术研究发展计划(863)(2011AA03A404)、内蒙古包钢稀土(集团)高科技股份有限公司博士后工作站项目(201H1721)和内蒙古自然科学基金(2013MS0802)项目资助。

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https://www.cjmr.org/CN/10.11901/1005.3093.2015.004 或 https://www.cjmr.org/CN/Y2015/V29/I11/829

图1 在1473 K分别退火16和30 h样品的XRD图谱、M-T曲线和△SM-T曲线

图2 退火及其在0.13和0.2 MPa下吸氢5 h样品的M-T曲线

图3 在1473 K退火30 h样品、0.2 MPa和0.13 MPa吸氢样品的M-B曲线及其△SM-T曲线

图4 吸氢压力为0.13和0.2 MPa样品放氢处理的TC与放氢时间的关系

图5 在473 K放氢在0.2 MPa吸氢再放氢180 min、在0.13 MPa吸氢再放氢75 min和在0.13 MPa吸氢再放氢105 min样品的M-B曲线及其△SM-T曲线

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