Basic researches for development of regenerator materials having giant magnetic specific heats and high thermal conductivitie

大磁比热高导热蓄热材料开发基础研究

• 批准号: 07505007
• 负责人: MIZUTANI Uichiro
• 金额: $ 28.29万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07505007/
• 关键词: regenerator materials; giant magnetic specific heats; rare earth-Ag lalloys; 蓄冷材; 熱伝導率

Main conclusions derived from the present research project are summarized below.(1) The low temperature specific heat and magnetic properties have been studies on various rare earth-Ag alloys whose magnetic transition temperature falls in the range 3-40K.We found that Er-Ag, 2r-Ag-Al, Er-Ag-Ga, Pr-Ag, Nd-Ag, Pr-Nd-Ag alloys possess both extremely large magnetic specific heat and high thermal conductivities in the relevant temperature range and that they are well suited as the regenerator materials.(2) We could successfully prepare the Er-Ag spherical particles with 0.1-0.2mm in diameter. We could reach the lowest temperature of 7K by using the Er-Ag particles as regenerator materials in the conventional GM refrigerator.(3) We modified the onventional GM refrigerator and could monitor the pressure and temperature during cooling and heating stages at various positions in the regenerator materials by mounting pressure and temperature sensors. In this way, we could establish the system to evaluate the regenerator materials suitable for the refrigerator.

本研究项目得出的主要结论概述如下。(1)本文研究了磁转变温度为福尔斯3- 40 K的稀土-Ag合金的低温比热和磁性能，发现Er-Ag，2 r-Ag-Al，Er-Ag-Ga，Pr-Ag，Nd-Ag，Pr-Nd-Ag合金在相应温度范围内具有极大的磁比热和高的热导率，是一种很好的蓄冷材料。(2)我们成功地制备了直径为0.1-0.2mm的球形Er-Ag颗粒。在常规的GM制冷机中，采用Er-Ag颗粒作为蓄冷材料，可以达到7 K的最低温度。(3)本文对传统GM制冷机进行了改进，通过安装压力和温度传感器，实现了对蓄冷材料不同部位的制冷和制热过程中的压力和温度的监测。从而建立了适用于制冷机的蓄冷材料评价体系。

项目成果

W. Yagi: "Studies of low temperature specific heats and thermal conductivities of Cscl-type (Pr_<1-x>SNdx) Ag (0【less than or equal】x【less than or equal】1)intermetallic compounds ; application to regenerator " Japanese Journal of Applied Physics. (1997)

W. Yagi：《Cscl型(Pr_<1-x>SNdx)Ag(0【小于等于】x【小于等于】1)金属间化合物的低温比热和导热系数研究；应用于再生器”日本应用物理学杂志。（1997）

琵琶 哲志: "高い熱伝導率を持つEr-Ag系蓄冷材の開発" 低温工学. 31巻4号. 190-196 (1996)

Satoshi Biwa：“高导热率铒银基冷储存材料的开发”《低温工程》，第 31 卷，第 4 期，190-196（1996 年）。

T.Biwa, W.Yagi and U.Mizutani: "Evaluation of Low-Temperature Specific Heats and Thermal Conductivities of Er-Ag Alloys as Regenerator Materials" Japan.J.Appl.Phys.35-4A. 2244-2248 (1996)

T.Biwa、W.Yagi 和 U.Mizutani：“Er-Ag 合金作为蓄热材料的低温比热和导热系数的评估”Japan.J.Appl.Phys.35-4A。

琵琶哲志: "高い熱伝導率を持つEr-Ag系蓄冷材の開発研究" 低温工学. (1996)

琵琶哲志：“高导热率铒银基蓄冷材料的开发研究”《低温工程》（1996）。

T.Biwa, U.Mizutani: "Evaluation of Low-Temperature Specific Heats and Thermal Conductivities of Er-Ag Alloys as Regenerator Materials" Teion-Kogaku. 31-4. 190-196 (1996)

T.Biwa、U.Mizutani：“Er-Ag 合金作为蓄热体材料的低温比热和导热系数的评估”Teion-Kogaku。