摘要
使用工业纯度原材料制备出La0.6Pr0.4Fe11.4Si1.6B0.2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。
La0.6Pr0.4Fe11.4Si1.6B0.2 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 ka 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.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2015年第11期829-834,共6页
Chinese Journal of Materials Research
基金
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)
内蒙古自然科学基金(2013MS0802)项目资助~~
关键词
金属材料
磁性材料
磁热性能
放氢
稳定性
居里温度
metallic materials, magnetic materials, magnetocaloric properties, hydrogen desorption, stability, Curie temperature
