论文总字数：14136字

摘 要

磁致冷技术是以磁性材料为介质的一种新型的制冷技术，而且作为一项全新技术，其包括了无需使用有害气体、所用的固态磁致冷材料（磁介质）有利于系统集成细化，具有高制冷效率、低能耗、噪音低、有良好的可靠性、体积更小、更容易维护、使用寿命更加长并且且对环境污染很小甚至无环境污染等优点，是一种高新绿色的制冷技术，环境价值和社会价值十分显著，成为将来的一种制冷技术的主导的可能性非常大。我们所需要做的，就是在低温端吸取热量，然后将热量传导到高温端并释放到系统外，而制冷的目的则是通过不断循环这个过程来累积达到。而且由于室温磁制冷这项技术的应用前景有着非常广泛的范围，比如在电器、汽车、食品、医疗卫生等领域。因此，找到一种室温磁制冷材料并且其有着巨磁效应，是一件十分重要并且急切的事情，这能大大促进磁制冷技术用于实际的发展。传统的气体制冷技术相比，磁制冷技术备受人们的关注的原因正是磁制冷有着高效、节能、环保、成本低廉等多方面的优点。

关键词：磁制冷 磁热效应 制冷材料

Abstract

Magnetic refrigeration technology is a new type of magnetic material as medium cooling technology, and as a new technology, which include the need for harmful gas, solid magnetic refrigeration materials used in the magnetic medium () to refine system integration, high cooling efficiency, low energy consumption, low noise, good reliability, smaller volume, and easier to maintain, long service life is more and the environmental pollution is small and the advantages of no environmental pollution, is a high-tech green refrigeration technology, environmental value and social value is significant, the future of a refrigeration technology has become the dominant possibility is very large. With the aid of the magnetocaloric effect of magnetic material, the isothermal magnetization magnetic materials will release heat to the world and the adiabatic demagnetization and can absorb heat from the outside world, is the basic principle of this new type of refrigeration technology. In the process of project production, we need to do, is on the low side absorb heat, then put the high temperature heat conduction to the side and release to the outside of the system, and

the purpose of refrigeration is to accumulate to cycle through the process. Moreover, the application prospect of magnetic refrigeration at room temperature has a wide range of applications, such as electric appliances, automobiles, food, medical and health care. Therefore, it is very important and urgent to find a kind of magnetic refrigeration material at room temperature with huge magnetic effect, which can greatly promote the development of magnetic refrigeration technology in practice. Compared with the traditional gas refrigeration technology, magnetic refrigeration technology attracts people's attention precisely because magnetic refrigeration has many advantages such as high efficiency, energy saving, environmental protection and low cost.

目录

第一章 绪论 4

1.1材料基因的介绍 4

1.2磁热材料的材料基因 4

1.2.1磁热效应介绍 4

1.2.2磁制冷研究背景 4

1.2.3磁制冷技术原理 6

1.2.4磁制冷材料的研究 6

1.2.5室温磁致冷材料的选择依据 8

1.2.6材料制备方法 8

1.2.7磁相变材料基因 9

1.3LaFeSi系稀土磁致冷材料 10

第二章 实验制备及测试方法 11

2.1实验制备 11

2.1.1实验设备介绍 11

2.1.2实验方法 12

2.1.3成分设计 13

2.2实验测试方法 13

第三章 LaFe_11.1Co_0.7Si_1.2磁相变研究 15

3.1 LaFeSi的背景介绍 15

3.1.1LaFe_13-xSi_x的磁热效应 15

3.1.2LaFeSi的不足以及解决办法 15

3.2样品制备流程 16

3.2.1原料选择 16

3.2.2真空熔炼制备室温磁制冷材料 16

3.3样品性能分析 16

3.3.1样品XRD分析 16

3.3.2LaFe_11.1Co_0.7Si_1.2的磁性能 17

3.3.3样品的磁化曲线M-H 19

3.3.4LaFe_11.1Co_0.7Si_1.2的Arrot曲线 20

结论 22

参考文献 23

致谢 24

1. 绪论

1.1材料基因的介绍

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