Magnetic alloy serving as magnetic refrigeration material

A technology of magnetic refrigeration materials and magnetic alloys, applied in the field of magnetic alloys, can solve problems such as difficult operation, obstacles to the ideal and practical working medium of magnetic refrigeration materials, and large and complex refrigeration systems, and achieve the effects of easy control, abundant reserves, and huge magnetocaloric effect

Active Publication Date: 2013-10-02
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to different material systems, the required working systems such as external magnetic field and heat transfer medium are generally different. For multiple different material systems, multiple working systems are required, which will cause the entire refrigeration system to be huge and complicated, and difficult to operate.
These existing problems prevent the existing magnetic refrigeration materials from becoming ideal and practical working fluids for magnetic refrigeration technology.

Method used

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  • Magnetic alloy serving as magnetic refrigeration material
  • Magnetic alloy serving as magnetic refrigeration material
  • Magnetic alloy serving as magnetic refrigeration material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation composition of this embodiment is Mn 30 co 3 Ni 30 Ge 37 The subscripts of each element represent the atomic number percentage content of the corresponding element in the alloy. For example, Mn 30 co 3 Ni 30 Ge 37 The alloy means that the alloy contains 30 atomic percent of Mn element, 3 atomic percent of Co element, 30 atomic percent of Ni element and 37 atomic percent of Ge element. In other embodiments, the same explanation is also made.

[0026] Step 1.1: According to the molar ratio of Mn:Co:Ni:Ge=30:3:30:37, respectively weigh Mn, Co, Ni, Ge metal raw materials with a purity of 99.9%;

[0027] Step 1.2: Put the weighed raw materials into the crucible, and use a mechanical pump to evacuate the vacuum to 2×10 -3 Below Pa, argon gas is introduced as a protective gas, the polycrystalline sample ingot is melted by arc melting method, the melting current is 100A, each sample is turned 3 times, and smelted 4 times in total to ensure uniform compo...

Embodiment 2

[0031] The composition of the preparation is Mn 23 co 10 Ni32 Ge 35 Magnetic Alloy Strip:

[0032] Step 2.1: According to the molar ratio of Mn:Co:Ni:Ge=23:10:32:35, respectively weigh Mn, Co, Ni, Ge metal raw materials with a purity of 99.9%;

[0033] Step 2.2: Put the weighed raw materials into the crucible, and use a mechanical pump to pump the vacuum to 2×10 -3 Below Pa, argon gas is introduced as a protective gas, the polycrystalline sample ingot is melted by arc melting method, the melting current is 100A, each sample is turned 3 times, and smelted 4 times in total to ensure uniform composition;

[0034] Step 2.3: The obtained button spindle material is sealed in a vacuum quartz tube, annealed at 850°C for 120 hours for homogenization annealing treatment, and then cooled to room temperature at a cooling rate of 2°C / s;

[0035] Step 2.4: Put the annealed button ingot into a quartz tube with a small hole at the bottom, place it in the furnace cavity of the belt throwin...

Embodiment 3

[0037] The composition of the preparation is Mn 24 co 6 Ni 37 Ge 33 Magnetic alloy: except that the molar ratio of the constituent elements is Mn:Co:Ni:Ge=24:6:37:33, and the annealing temperature of the sample is 900°C, and the annealing time is 96 hours, the rest of the steps are the same as in Example 1. The phase transition temperature and magnetic entropy change values ​​of the samples are shown in Table 1.

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Abstract

The invention discloses a magnetic alloy. The chemical general formula of the magnetic alloy is (Mn100-deltaCodelta) alphaNibetaGegamma, wherein alpha is more than or equal to 25 and less than or equal to 40, beta is more than or equal to 25 and less than or equal to 40, gamma is more than or equal to 25 and less than or equal to 40, alpha+beta+gamma is equal to 100, delta is more than 0 and less than 50, and alpha, beta, gamma and delta refer to the atomic percent content. The magnetic alloy has a huge magnetocaloric effect and high magnetic refrigeration efficiency and can stably operate in a wide temperature range temperature area by serving as a magnetic refrigeration working medium. The required raw materials Mn, Co, Ni and Ge are the conventional metal elements which are low in price, rich in reserves and easy to store. The material is simple and reliable in preparation process, high in process stability and easy to industrially produce. The provided magnetic material (Mn100-deltaCodelta) alphaNibetaGegamma with the huge magnetocaloric effect has excellent comprehensive performance and is an ideal Mn-based non-rare earth magnetic refrigeration candidate material.

Description

technical field [0001] The invention relates to a magnetic refrigeration material, in particular to a magnetic alloy which can be used as a magnetic refrigeration material. Background technique [0002] Common magnetic refrigeration materials have one crystal structure (hereinafter referred to as high-temperature phase) at relatively high temperatures, and spontaneously change into another crystal structure (hereinafter referred to as low-temperature phase) at relatively low temperatures. When cooling from a higher temperature to a lower temperature, the material transitions from a high-temperature phase to a low-temperature phase. Conversely, by heating the material from a relatively low temperature, the material undergoes a phase transition from a low-temperature phase to a high-temperature phase. This opposite phase transition is called an inverse phase transition of the crystal structure. [0003] Generally, materials with such a phase transition will undergo a phase tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C09K5/02
Inventor 刘恩克王文洪吴光恒
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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