稀土纳米磁致冷复合材料①
来源期刊:中国有色金属学报1996年第1期
论文作者:邵元智 熊正烨 张介立
文章页码:70 - 73
关键词:纳米复合材料; 磁致冷; 稀土; 变形
Key words:nanocomposite solids; magnetic refrigeration; rare-earth; mechanical deforming
摘 要:采用急冷快谇,高能球磨及粉末包套包覆轧制方法制备出Gd-Y,Gd-Zn和Gd-Tb的纳米固体复合磁致冷材料。实验测试结果表明:与大块状材料相比。纳米固体的居里温度明显降低,比热显著增加;Gd-Tb和Gd-Zn合金的磁热熵效应有所降低,但Gd-Y系的磁热熵效应则显著增加。对制备工艺条件及若干影响磁热熵效应的因素进行了较详细的分析。
Abstract: The nanocomposite solids of rare-earth alloys Gd-Y, Gd-Zn and Gd-Tb for magnetic refrigerant have been prepared by means of rapid quenching and ball-milling as well as powder coating-rolling. It turns out that both Curie temperature and specific heat of the prepared nanocomposite solids,compared with the bulk mate-rials,show obviously decrease and increase respectively. The magnetocaloric effect(MCE) of Gd-Y alloy demon-strates an unique raising rather than reducing of both Gd-Tb and Gd-Zn. A discussion concerning the influence of preparing parameters on magnetocaloric effect is given in detail.