Hydrogenated NiMn-based alloy magnetic refrigeration material and preparation method and use thereof
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A technology based on alloys and magnetic materials, applied in the field of hydrogenated NiMn-based Heusler alloy magnetic refrigeration materials and its preparation
Inactive Publication Date: 2010-12-22
INST OF PHYSICS - CHINESE ACAD OF SCI
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Studies have found that although this type of traditional Heusler alloy exhibits a huge magnetic entropy change effect (for example: -86J / kgK), its magnetic entropy change value often appears in a very narrow temperature range (for example: 1-2K)
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Embodiment 1
[0074] Embodiment 1 prepares Ni 51 mn 32.4 In 16.6 H 3 Hydride
[0075] This embodiment provides to prepare Ni by chemical formula 51 mn 32.4 In 16.6 h 5.2 The concrete example of hydride, concrete process is:
[0076] 1) First, according to the chemical formula Ni 51 mn 32.4 In 16.6 As for ingredients, the purity of raw materials Ni, Mn and In are 99.99wt%, 99.9wt% and 99.99wt% respectively.
[0077] 2) Put the Ni, Mn, In raw materials prepared in step 1) into the electric arc furnace, and vacuumize to 2×10 -3 Pa, clean the furnace cavity twice with high-purity argon gas with a purity of 99.996%, and then fill the furnace cavity with high-purity argon gas with a purity of 99.996% to an atmospheric pressure, start the arc, and repeatedly smelt each alloy ingot 4 times. The temperature is 2000 degrees Celsius. After the smelting is completed, the cast alloy is obtained by cooling in a copper crucible.
[0078] 3) Wrap the cast alloy ingots prepared...
Embodiment 2
[0086] Embodiment 2 prepares Ni 51 mn 32.8 In 16.2 H 1.4 Hydride
[0087] This embodiment provides to prepare Ni by chemical formula 51 mn 32.8 In 16.2 h 1.4 The concrete example of hydride, concrete process is:
[0088] 1) First, according to the chemical formula Ni 51 mn 32.8 In 16.2 As for ingredients, the purity of raw materials Ni, Mn and In are 99.99wt%, 99.9wt% and 99.99wt% respectively.
[0089] 2) Put the Ni, Mn, In raw materials prepared in step 1) into the electric arc furnace, and vacuumize to 2×10 -3 Pa, the furnace cavity is cleaned twice with high-purity argon gas with a purity of 99.996%, and then the furnace cavity is filled with high-purity argon gas with a purity of 99.996% to an atmospheric pressure. The arc is started, and each alloy ingot is repeatedly smelted 4 times at a melting temperature of 2000 degrees Celsius. After smelting, it is cooled in a copper crucible to obtain an as-cast alloy.
[0090] 3) Wrap the cast alloy...
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Abstract
The invention provides a hydrogenated NiMn-based alloy magnetic refrigeration material with big magnetic entropy change. The magnetic refrigeration material has a chemical general formula of NixMnyMzHalpha, and a NixMnyMz alloy before hydrogen absorption has L21 Heusler (Heusler) type structure, wherein M is the combination of one or more of the following elements in any ratio: In, Sb, Sn and Ga. The invention also provides a method for preparing the material, which comprises the following steps of: firstly, smelting and annealing to prepare a NixMnyMz single-phase alloy; then annealing to prepare a NixMnyMzHalpha hydride under hydrogen pressure; and regulating the hydrogen content in the alloy by controlling the hydrogen pressure, the annealing temperature and time. The introduction of a hydrogen atom makes the martensite phase transformation temperature move to low temperature. Therefore, huge magnetic entropy change occurs in a controllable temperature region, the magnetic entropy amplitude is higher than Gd, and the material is an ideal magnetic refrigeration material in a high-temperature region even in a room temperature region.
Description
technical field [0001] The invention relates to a magnetic refrigeration material, in particular to a hydrogenated NiMn-based Heusler alloy magnetic refrigeration material with large magnetic entropy change and a preparation method thereof. Background technique [0002] Human life in modern society is increasingly inseparable from refrigeration technology, ranging from people's daily life to industrial and agricultural production and national defense technology. Magnetic refrigeration technology, especially room temperature magnetic refrigeration technology has a huge market demand, and once implemented, it will play a huge role in global energy conservation and environmental protection. Magnetic refrigeration research is mainly divided into two aspects, one is the exploration of high-efficiency magnetic refrigeration materials; the other is the development of magnetic refrigeration prototypes. In the research of the room temperature magnetic refrigeration prototype, the re...
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