稀土基非晶合金的低温磁性蓄冷性能研究

项目名称： 稀土基非晶合金的低温磁性蓄冷性能研究

项目编号： No.51301188

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 一般工业技术

项目作者： 霍军涛

作者单位： 中国科学院宁波材料技术与工程研究所

项目金额： 25万元

中文摘要： 开发高效的低温磁性蓄冷材料是提高小型低温制冷机制冷效率的关键。而传统晶态磁性蓄冷材料存在比热峰较窄、比热峰温度高、不易于加工成形等问题。针对这些问题，本项目拟将磁转变温区宽、磁转变温度低、加工性能好的非晶合金引入到磁性蓄冷材料领域，考察其作为低温磁性蓄冷材料应用的关键性能参数和可行性。拟在现有晶态低温磁性蓄冷材料的成分基础上，以非晶形成理论为指导，通过添加利于非晶形成的元素，采用水冷铜模铸造法开发新型具有优异低温磁蓄冷性能的稀土基非晶合金。通过考察合金的合金成分、微观结构、磁性能和低温比热，揭示出影响非晶合金低温磁性蓄冷性能的成分因素、结构因素和磁性因素，并建立相互之间的关联性。利用此关联性，通过成分调整、热处理等手段进一步优化合金的低温磁性蓄冷性能。为稀土基非晶合金作为低温磁性蓄冷材料的实际应用，提供初步的实验数据和理论指导。

中文关键词： 非晶合金；微丝；磁性能；蓄冷性能；磁热性能

英文摘要： The development of efficient low-temperature magnetic regenerator materials is the key to improve the cooling efficiency and performance of small cryocoolers. However, the conventional crystalline magnetic regenerator materials have some inherent drawbacks that limit their application, such as the narrow specific heat peaks, the poor processibility and the high temperature of the specific heat peak. To address these problems, we propose to study potential application of the metallic glasses with wide magnetic transition temperature region, good processing performance and low magnetic transition temperature. The key performance parameters and feasibility of the metallic glasses using as low-temperature magnetic regenerator materials will be investigated. In this project, to explore new rare earth based metallic glasses with excellent low-temperature magnetic regenerator performance, we would change the composition of the existing crystalline alloys by adding some new elements that can improve the glass forming ability. The well-known criteria for glass-forming ability can help in designing the alloy compositions. The water-cooled copper mold casting method will be applied in the fabricating the alloys. The composition, microstructure, magnetic property and the low temperature specific heat of the alloys will be i

英文关键词： Amorphous alloy；micro wire；magnetic property；regenerator performance；magnetocaloric property