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Preparation method of rare earth-chrome-silicone-based magnetic refrigerating material

A magnetic refrigeration material, silicon-based technology, applied in the field of materials science, can solve the problems of small magnetic entropy, commercial application limitations, etc., and achieve the effects of significant magnetic entropy change, low cost, and high magnetic refrigeration capacity.

Active Publication Date: 2013-08-07
SERVICE CENT OF COMMLIZATION OF RES FINDINGS HAIAN COUNTY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the current magnetic refrigeration materials in the low temperature region mainly include Gd 3 Ga 5 o 12 , GdLiF 4 Isoparamagnetic metal salts and some rare earth intermetallic compounds, but their commercial application is limited due to their relatively small magnetic entropy change and the need for a large magnetic field

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Step (1). 17.06g (0.102 moles) of rare earth metal Er, 10.4g (0.2 moles) of metal Cr and 5.617g (0.2 moles) of non-metallic Si are uniformly mixed into raw materials;

[0018] Step (2). Put the raw materials in the electric arc furnace, vacuumize the electric arc furnace, and the pressure in the furnace reaches 1×10 -2 After Pa, after 4 times of purging the furnace chamber with volume purity of 99.9% argon, then filling with volume purity of 99.9% argon makes the pressure in the container reach 0.98 standard atmospheric pressure;

[0019] Step (3). The arc discharge in the electric arc furnace heats the raw material until it is completely melted, stops heating after continuing to heat for 10 seconds, and naturally cools to normal temperature to form a lump;

[0020] Step (4). Turn the block over and heat it again in the electric arc furnace until it is completely melted. After continuing to heat for 10 seconds, stop heating, and naturally cool to normal temperature. Rep...

Embodiment 2

[0025] Step (1). 16.74g (0.103 moles) of rare earth metal Dy, 10.4g (0.2 moles) of metal Cr and 5.617g (0.2 moles) of non-metal Si were uniformly mixed into raw materials;

[0026] Step (2). Put the raw material in the induction heating furnace, vacuumize the induction heating furnace, and the pressure in the furnace reaches 0.9×10 -2 After Pa, after 3 times of cleaning the furnace chamber with volume purity of 99.92% argon, then filling with volume purity of 99.92% argon makes the pressure in the container reach 0.96 standard atmospheric pressure;

[0027] Step (3). The induction heating furnace is energized to heat the raw materials until they are completely melted. After continuing to heat for 30 seconds, stop heating, and naturally cool to room temperature to form lumps;

[0028] Step (4). Turn the block over and heat it again in the induction heating furnace until it is completely melted. After continuing to heat for 30 seconds, stop heating, naturally cool to room temper...

Embodiment 3

[0033] Step (1). 16.51g (0.105 moles) of rare earth metal Gd, 10.4g (0.2 moles) of metal Cr and 5.617g (0.2 moles) of non-metal Si are uniformly mixed into raw materials;

[0034] Step (2). Put the raw materials in the electric arc furnace, vacuumize the electric arc furnace, and the pressure in the furnace reaches 0.8×10 -2 After Pa, after 2 times of cleaning the furnace chamber with argon gas with a volume purity of 99.95%, it is 99.95% argon gas to be filled with a volume purity, so that the pressure in the container reaches 0.92 standard atmospheric pressure;

[0035] Step (3). The arc discharge in the electric arc furnace heats the raw material until it is completely melted, stops heating after continuing to heat for 20 seconds, and naturally cools to normal temperature to form a lump;

[0036]Step (4). Turn the block over and heat it again in the electric arc furnace until it is completely melted. After continuing to heat for 20 seconds, stop heating, and naturally cool ...

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Abstract

The invention relates to a rare earth-chrome-silicone-based magnetic refrigerating material and a preparation method thereof. The chemical general formula of the magnetic material is R-Cr2-Si2, wherein R is rare earth metal Er, Gd or Dy; and the magnetic material has a body-centered ThCr2Si2 tetragonal lattice structure. The preparation method comprises the following steps of: firstly, mixing therare earth metal Er, Gd or Dy, Cr and Si in a certain ratio to obtain a mixture serving as raw materials; secondly, putting the raw materials into a melting container, and repeatedly melting under the protection of argon gas to obtain an alloy cast ingot with uniform components; thirdly, sealing the melted alloy cast ingot into a vacuum quartz container, and annealing at high temperature; and finally, quickly cooling to normal temperature to obtain a finished product. The preparation method is simple, low in cost and applicable to industrialization; and the prepared magnetic material has excellent magnetic and thermal reversibility.

Description

technical field [0001] The invention belongs to the technical field of materials science and relates to a magnetic functional material, in particular to a preparation method of a rare earth-chromium-silicon low-temperature magnetic refrigeration material used for magnetic refrigeration. Background technique [0002] Magnetic refrigeration material is a new type of magnetic functional material. It is a non-polluting refrigerant material that uses the magnetic entropy effect (magnetocaloric effect, also known as the magnetic card effect) of magnetic materials to achieve refrigeration. The magnetic entropy effect is one of the intrinsic properties of magnetic materials, and its size depends on the intrinsic physical properties of magnetic materials. Magnetic refrigeration is the use of an external magnetic field to make the magnetic moment of the magnetic working medium change orderly and disorderly (phase transition) to cause the magnet to absorb heat and release heat to perfo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C28/00C22C1/02C22F1/02C22F1/16C09K5/14
Inventor 李领伟霍德璇彭英姿赵士超钱正洪
Owner SERVICE CENT OF COMMLIZATION OF RES FINDINGS HAIAN COUNTY
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