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Rare earth-copper-aluminum material for magnetic refrigeration and preparation method thereof

A technology of aluminum materials and magnetic refrigeration, applied in the direction of magnetic materials, heat exchange materials, chemical instruments and methods, etc., can solve the problems of commercial application limitations, low magnetic-caloric performance of magnetic refrigeration materials, etc., and achieve the effect of low price

Active Publication Date: 2012-05-16
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 the low magnetocaloric performance of the above-mentioned magnetic refrigeration materials, its commercial application is limited.

Method used

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  • Rare earth-copper-aluminum material for magnetic refrigeration and preparation method thereof
  • Rare earth-copper-aluminum material for magnetic refrigeration and preparation method thereof
  • Rare earth-copper-aluminum material for magnetic refrigeration and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1 Preparation and property determination of HoCuAl

[0042] In this example, HoCuAl was prepared and its properties were measured.

[0043] (1) The preparation of HoCuAl specifically comprises the following steps:

[0044] Step 1): Weighing materials according to the HoCuAl chemical formula (ie atomic ratio), mixing commercially available rare earth metal Ho, Cu, and Al raw materials with a purity higher than 99.9%, and adding 5% (atomic percentage) of Ho in excess;

[0045] Step 2): Put the prepared raw materials in step 1) into the electric arc furnace or induction heating furnace for vacuuming, when the vacuum degree reaches 2×10 -3 ~3×10 -3 Pa, after cleaning with high-purity argon with a purity of 99.999% for 1-2 times, vacuum again to 2×10 -3 ~3×10 -3 Pa, filled with high-purity argon protection, the pressure in the furnace chamber is 1 atmosphere, repeated turning and melting for 3-5 times, and the melting temperature is between 1500°C and 1700°C; ...

Embodiment 2

[0059] Example 2 Preparation and property determination of ErCuAl

[0060] In this example, ErCuAl was prepared and its properties were measured.

[0061] (1) The preparation of ErCuAl specifically comprises the following steps:

[0062] Step 1): weighing materials according to ErCuAl chemical formula (ie atomic ratio), mixing commercially available rare earth metals Er, Cu, and Al with a purity higher than 99.9%, and adding 2% (atomic percentage) of Er in excess;

[0063] Step 2): Put the prepared raw materials in step 1) into the electric arc furnace or induction heating furnace for vacuuming, when the vacuum degree reaches 2×10 -3 -3×10 -3 Pa, after cleaning with high-purity argon with a purity of 99.999% for 1-2 times, vacuum again to 2×10 -3 ~3×10 -3 Pa, filled with high-purity argon protection, the pressure in the furnace chamber is 1 atmosphere, repeated turning and melting for 3-5 times, and the melting temperature is between 1500°C and 1700°C;

[0064] Step 3):...

Embodiment 3

[0074] Example 3 Preparation and property determination of DyCuAl

[0075] In this example, DyCuAl was prepared and its properties were measured.

[0076] (1) The preparation of DyCuAl specifically comprises the following steps:

[0077] Step 1): weighing materials according to the chemical formula of DyCuAl (ie, atomic ratio), mixing commercially available rare earth metals Dy, Cu, and Al with a purity higher than 99.9%, wherein Dy is excessively added by 5% (atomic percentage);

[0078]Step 2) and step 3) are identical with embodiment 1.

[0079] (2) Performance determination of DyCuAl

[0080] 1) X-ray diffraction lines

[0081] The room temperature X-ray diffraction spectrum of DyCuAl crystalline compound is as follows Figure 11 shown. the result shows,

[0082] DyCuAl has a single-phase ZrNiAl-type hexagonal crystal structure with a space group of Its lattice parameter

[0083] 2) Thermomagnetic curve

[0084] The thermomagnetic (M-T) curve of DyCuAl crysta...

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Abstract

The invention provides a rare earth-copper-aluminum material for magnetic refrigeration and a preparation method thereof. The rare earth-copper-aluminum material for magnetic refrigeration is a compound having a general formula of RCuAl, wherein R represents Ho, Er, Dy, Tb or Gd. The rare earth-copper-aluminum material for magnetic refrigeration has a large magnetic entropy change around respective phase change temperatures of rare earth, copper and aluminum, a large magnetic refrigeration capacity, good thermal and magnetic reversible properties, and a low price, and thus the rare earth-copper-aluminum material for magnetic refrigeration is a very ideal middle / low-temperature zone magnetic refrigeration material.

Description

technical field [0001] The invention relates to magnetic materials, in particular to a rare earth-copper-aluminum material for magnetic refrigeration and a preparation method thereof. Background technique [0002] In today's world, refrigeration and low-temperature technology play a very important role and are related to many important areas of the national economy and people's livelihood. Traditional gas compression refrigeration technology has been widely used in various industries, but it has disadvantages such as low refrigeration efficiency, high energy consumption, and damage to the atmospheric environment. Magnetic refrigeration technology refers to a new type of refrigeration technology that uses magnetic materials as refrigerants. Compared with the traditional gas compression refrigeration technology, it has significant advantages such as high efficiency and energy saving, green environmental protection, stability and reliability, and is known as a high-tech green ...

Claims

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Application Information

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IPC IPC(8): C09K5/02H01F1/055C22F1/08C22F1/057
CPCH01F1/015
Inventor 董巧燕沈保根陈静胡凤霞孙继荣
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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