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Rare earth-palladium-aluminum material for magnetic refrigeration and its preparation method and use

A technology of magnetic refrigeration materials and aluminum materials, which can be used in magnetic materials, heat exchange materials, chemical instruments and methods, etc., and can solve problems such as commercial application limitations.

Inactive Publication Date: 2011-12-28
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are even fewer magnetic refrigeration materials found in the cryogenic temperature region, especially the magnetic refrigeration materials with a phase transition temperature below 5 K and a large magnetocaloric effect have not been obtained, which limits their commercial application.

Method used

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  • Rare earth-palladium-aluminum material for magnetic refrigeration and its preparation method and use
  • Rare earth-palladium-aluminum material for magnetic refrigeration and its preparation method and use
  • Rare earth-palladium-aluminum material for magnetic refrigeration and its preparation method and use

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Experimental program
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Effect test

Embodiment 1

[0052] According to a first embodiment of the present invention, there is provided a method for preparing ErPdAl with a hexagonal crystal structure, comprising the following steps:

[0053] Step 1): weighing materials according to ErPdAl chemical formula (ie atomic ratio), mixing commercially available rare earth metal Er with a purity of 99.9% with Pd and Al raw materials, wherein Er is added in excess of 2% (atomic percentage);

[0054] Step 2): Put the raw materials configured in step 1) into the electric arc furnace to vacuumize, when the vacuum degree reaches 3×10 -3 Pa, after cleaning twice with high-purity argon with a purity of 99.999%, repeated turning and melting for five times under the protection of high-purity argon at 1 atmosphere, the melting temperature is between 1200°C-1500°C, after melting The furnace was cooled to room temperature and the product was obtained.

[0055] Utilize X-ray diffractometer to measure the room temperature X-ray diffraction spectrum ...

Embodiment 2

[0062] According to a second embodiment of the present invention, there is provided a method for preparing ErPdAl with a hexagonal crystal structure, comprising the following steps:

[0063] Step 1): weighing materials according to ErPdAl chemical formula (ie atomic ratio), mixing commercially available rare earth metal Er with a purity of 99.9% with Pd and Al raw materials, wherein Er is added in excess of 2% (atomic percentage);

[0064] Step 2): Put the raw materials configured in step 1) into the electric arc furnace to vacuumize, when the vacuum degree reaches 3×10 -3 Pa, after cleaning twice with high-purity argon with a purity of 99.999%, repeated turning and melting for five times under the protection of high-purity argon at 1 atmosphere, the melting temperature is between 1200°C-1500°C, after melting Cool the furnace to room temperature;

[0065] Step 3): Cool the cast alloy in a copper crucible, wrap the cast alloy with molybdenum foil, and seal it in a vacuum of 5×...

Embodiment 3

[0072] According to a third embodiment of the present invention, there is provided a method for preparing ErPdAl with an orthorhombic crystal structure, comprising the following steps:

[0073] Step 1): weighing materials according to ErPdAl chemical formula (ie atomic ratio), mixing commercially available rare earth metal Er with a purity of 99.9% with Pd and Al raw materials, wherein Er is added in excess of 2% (atomic percentage);

[0074] Step 2): Put the raw materials configured in step 1) into the electric arc furnace to vacuumize, when the vacuum degree reaches 3×10 -3 Pa, after cleaning twice with high-purity argon with a purity of 99.999%, repeated turning and melting for five times under the protection of high-purity argon at 1 atmosphere, the melting temperature is between 1200°C-1500°C, after melting Cool the furnace to room temperature;

[0075] Step 3): Cool the cast alloy in a copper crucible, wrap the cast alloy with molybdenum foil, and seal it in a vacuum of...

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Abstract

The present invention provides a rare earth-palladium-aluminum material for magnetic refrigeration and its preparation method and application. The rare earth-palladium-aluminum material is a compound of the following general formula: RPdAl, wherein R is a rare earth element, preferably, R is Any one of Tb, Dy, Ho, Er elements, or R is Er element and Gd, Tb, Dy, Ho, Ho element and Gd, Tb, Dy, Er, Dy element and Gd, Tb, Ho, Er, And the combination of Tb element and any one of Gd, Dy, Ho, and Dy elements. The phase transition temperatures of the rare earth-palladium-aluminum materials of the present invention, especially ErPdAl and HoPdAl, are 5K and 13K respectively, and the magnetic entropy changes are higher than 20Jkg-1K-1 near the respective phase transition temperatures, and have relatively large magnetic refrigeration Capability and good thermal and magnetic reversible properties, it is an ideal magnetic refrigeration material in the low temperature region.

Description

technical field [0001] The invention relates to a rare earth-palladium-aluminum material for magnetic refrigeration, a preparation method and application thereof. Background technique [0002] Human life in modern society is increasingly inseparable from refrigeration technology, from people's daily life to industrial and agricultural production, national defense technology, etc. cannot do without refrigeration technology. At present, gas compression refrigeration technology is generally used to achieve refrigeration, but traditional gas compression refrigeration technology also has problems such as high energy consumption, harmful gases emitted during the refrigeration process, destroying the atmospheric ozone layer or causing greenhouse effects. Therefore, it is of great significance to explore new refrigeration technologies that are both energy-saving and environmentally friendly. Compared with gas compression refrigeration technology, magnetic refrigeration technology h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C28/00C22C30/00H01F1/053C09K5/14
Inventor 沈保根许志一沈俊吴剑峰孙继荣
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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