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| 粉末冶金法制备La(Fe11.05Co0.85Si1.1)B0.25化合物的磁热效应 | |
| 引用本文： | 武清,黄焦宏,刘翠兰,闫宏伟,邓沅,程娟.粉末冶金法制备La(Fe11.05Co0.85Si1.1)B0.25化合物的磁热效应[J].稀有金属,2011,35(3). |
| 作者姓名： | 武清 黄焦宏 刘翠兰 闫宏伟 邓沅 程娟 |
| 作者单位： | 1. 包头稀土研究院,内蒙古包头,014030;内蒙古科技大学材料与冶金学院,内蒙古包头,014010 2. 包头稀土研究院,内蒙古包头,014030;稀土冶金及功能材料国家工程研究中心,内蒙古包头,014030 3. 包头稀土研究院,内蒙古包头,014030 |
| 基金项目： | 国家自然科学基金资助项目，内蒙古自然科学基金资助项目(2009) |
| 摘 要： | 用非自耗电弧炉熔炼制备了La(Fe<,11.05>Co<,0.85>Si<,1.1>)B<,0.25>铸锭,并将该铸锭在氩气保护中球磨制粉,采用SPS(放电等离子烧结技术SparkPlasma Sintering)将该粉制成La(Fe<,11.05>Co<,0.85>Si<,1.1>)B<,0.25>合金,在高温(1070℃)下对其进行20 h热处理;空冷之后用XRD及SEM检测了铸锭热处理样品、SPS烧结样品及SPS热处理后样品的相及组织结构,利用VSM和磁热效应直接测量仪测量了这3种状态下合金的等温磁熵变和绝热温变.结果表明,铸锭合金的基相组织结构中晶粒大小规则较均匀,晶界清晰明显,在0～1.5 T的变化磁场下测得其等温磁熵变达到-5.22 J·(kg·K)<'-1>-,绝热温变也达到2.3 K,而采用SPS技术制得的样品的基相组织结构中没有明显晶界且夹杂较多,其等温磁熵变为-3.90 J·(kg·K)<'-1>,绝热温变为1.9 K(0～1.5 T);经过热处理的SPS样品基相组织结构中,有少量晶界形成,但晶粒大小不规则,测得其等温磁熵变为-3.72 J·(kg·K)<'-1>,绝热温变为1.5 K(0～1.5 T);与铸锭相比较,SPS技术制得的合金样品和经过高温热处理之后的SPS样品的绝热温变值和等温熵磁变值均降低,同比之下这两种样品较铸锭样品的居里点和半峰宽却发生了改变,均显著提高;可以看出采用SPS技术制备的室温磁制冷材料La(Fe<,11.05>Co<,0.85>Si<,1.1>)B<,0.25>能够在较宽的温度范围内制冷,但其磁热效应却相对降低. |
| 关 键 词： | 粉末冶金 SPS烧结 磁热效应 居里温度 |
Magnetocaloric Effect of La (Fe11.05Co0.85Si1.1)B,0.25 Compounds Prepared by Powder Metallurgy Method |
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| Wu Qing,Huang Jiaohong,Liu Cuilan,Yan Hongwei,Deng Yuan,Cheng Juan.Magnetocaloric Effect of La (Fe11.05Co0.85Si1.1)B,0.25 Compounds Prepared by Powder Metallurgy Method[J].Chinese Journal of Rare Metals,2011,35(3). | |
| Authors: | Wu Qing Huang Jiaohong Liu Cuilan Yan Hongwei Deng Yuan Cheng Juan |
| Affiliation: | Wu Qing1,3,Huang Jiaohong1,2,Liu Cuilan1,Yan Hongwei1,Deng Yuan1,Cheng Juan1(1.Baotou Research Institute of Rare Earths,Baotou 014030,China,2.National Engineering Research Centre of Rare Earth Metallurgy and Function Materials,3.School of Material and Metallurgy,Inner Mongolia University of Science and Technology,Baotou 014010,China) |
| Abstract: | La(Fe11.05Co0.85Si1.1)B0.25 as-cast was prepared by arc melting furnace in argon atmosphere.The alloy powder was prepared from the as-cast using mechanical method in argon atmosphere.The alloy bulk prepared from the alloy powder using spark plasma sintering method was heat-treated at 1343 K for 20 h and was cooled in air.The samples of the three different types(the as-cast alloy,the alloy prepared using SPS and SPS alloy after heat treatment) were investigated by means of XRD and SEM analysis apparatus.And ... |
| Keywords: | powder metallurgy spark plasma sintering magnetocaloric effect the Curie temperature |
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