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。
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 materials, show obviously decrease and increase respectively. The magnetocaloric effect(MCE) of Gd-Y alloy demonstrates 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.
出处
《中国有色金属学报》
EI
CAS
CSCD
1996年第1期70-73,78,共5页
The Chinese Journal of Nonferrous Metals
基金
广东省科委基金及中山大学科学基金
关键词
纳米材料
复合材料
磁致冷
稀土
变形
nanocomposite solids magnetic refrigeration rare-earth mechanical deforming