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MnNiSi-based magnetic alloy capable of serving as magnetic refrigeration material

A magnetic refrigeration material and magnetic alloy technology, applied in the field of magnetic alloys, can solve the problems of inoperable magnetic entropy change, narrow working temperature range of materials, and high application cost, and achieve the effects of improving energy conversion efficiency, similar properties, and easy storage.

Inactive Publication Date: 2017-05-10
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many of the current materials of this type still have many deficiencies: for rare earth-based compound refrigeration materials, the high proportion of precious rare earth metals has less reserves and is difficult to store, making the application cost too high; in many systems, the structural entropy changes The thermal effect of the thermal effect and the thermal effect of the magnetic entropy change are in the opposite direction, which offsets the effective thermal effect; most of the materials currently have a narrow working temperature range, and cannot work in a larger temperature range and achieve a larger magnetic entropy change

Method used

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  • MnNiSi-based magnetic alloy capable of serving as magnetic refrigeration material
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  • MnNiSi-based magnetic alloy capable of serving as magnetic refrigeration material

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Embodiment 1

[0039] The chemical formula of this embodiment preparation is Mn 0.4 Fe 0.6 NiSi 1-x Ga x The magnetic alloy bulk, where, Mn 0.4 Fe 0.6 NiSi 1-x Ga x The alloy represents the substitution of 60% (molar ratio) of Mn with Fe and the substitution of (100x)% (molar ratio) of Si with Ga in the MnNiSi alloy. In other embodiments, the same explanation is also made. Its preparation method is carried out according to the following specific steps:

[0040] (4) According to the molar ratio of Mn:Fe:Ni:Si:Ga=0.4:0.6:1:1-x:x, respectively weigh Mn, Fe, Ni, Si, Ga and other raw materials with a purity of 99.9%;

[0041] (5) Put the weighed raw materials into a water-cooled copper crucible, vacuumize with a mechanical pump, and purge with argon, repeat this 4 times, smelt polycrystalline sample ingots by suspension smelting, turn over 3 times for each sample, A total of 4 times of smelting was carried out to ensure uniform composition, and the alloy ingot was prepared.

[0042] (6)...

Embodiment 2

[0045] The chemical formula of this embodiment preparation is Mn 0.8 Fe 0.2 NiSi 1-x Ga x Magnetic phase change alloy: its preparation method is similar to the method of Example 1, except that step (1) reduces the substitution amount of Fe to Mn in the alloy to 20%, and the prepared Mn 0.8 Fe 0.2 NiSi 1-x Ga x The alloy has the same crystal structure and similar variation rules as that of Example (1). and show good magnetic drive performance as image 3 As shown, and the upper limit of the working temperature range is 536K, such as Figure 4 shown.

Embodiment 3

[0047] The chemical formula of this embodiment preparation is Mn 0.6 Fe 0.4 NiSi 1-x Ga x Magnetic phase change alloy: its preparation method is similar to the method of Example 1, the difference is that step (1) reduces the substitution amount of Fe to Mn in the alloy to 40%, and the prepared Mn 0.6 Fe 0.4 NiSi 1-x Ga x The alloy obtains a wide working temperature range up to 330K near room temperature and considerable magnetic entropy change. mn 0.4 Fe 0.6 NiSi 1-x Ga x The corresponding magnetization temperature dependence curve of the alloy is as follows Figure 5 As shown, Mn 0.6 Fe 0.4 NiSi 0.88 Ga 0.12 The magnetic entropy change-temperature curve of the alloy is as follows Figure 6 shown.

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Abstract

The invention discloses a MnNiSi-base magnetic alloy capable of serving as a magnetic refrigeration material, and belongs to the technical field of magnetic materials. The chemical formula of the magnetic alloy is Mn(1-z)MzNi(1-y)M'ySi(1-x)Xx, wherein M and M' are transition metals, and comprise Fe and Co; X is a main group element, and comprises Ge and Ga; z is larger than or equal to 0.1 and less than or equal to 0.7; y is larger than or equal to 0 and less than or equal to 0.5; x is larger than or equal to 0 and less than or equal to 0.5. A preparation method of the MnNiSi-base magnetic alloy comprises the following steps: preparing raw materials in a molar ratio, placing the prepared raw materials into an electric arc smelting furnace or a suspended smelting furnace, performing vacuum pumping, and smelting under the protection of argon gas to obtain an alloy ingot; annealing the smelted alloy ingot under the protection pure inert gas, and directly quenching in ice water to obtain the magnetic alloy. The magnetic alloy can undergo structural phase change within a wide temperature range, has a great magnetocaloric effect, and can have high magnetic refrigeration efficiency and a wide-temperature-range working range as a magnetic refrigeration working medium.

Description

technical field [0001] The invention relates to a magnetic material, in particular to a magnetic alloy which can be used as a magnetic refrigeration material. Background technique [0002] Refrigeration technology is widely used in modern production and life. The gas refrigerant used in the gas compression refrigeration technology commonly used at present will destroy the atmospheric ozone layer and cause the greenhouse effect, and the work efficiency is very low. Exploring non-polluting, green and environmentally friendly refrigeration materials and developing new high-efficiency refrigeration technologies are urgent problems in today's world. In recent years, magnetic refrigeration technology has attracted widespread attention at home and abroad. Compared with traditional compression refrigeration, the efficiency of magnetic refrigeration can reach 30% to 60% of the Carnot cycle, while gas compression refrigeration is generally only 5% to 10%, and the energy saving advan...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/02C09K5/14
CPCC22C30/00C09K5/14C22C1/02
Inventor 张红国陈杰岳明王铭哲张东涛刘卫强张久兴
Owner BEIJING UNIV OF TECH
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