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Rare earth-nickel-boron-carbon based magnetic material for low-temperature magnetic refrigeration and preparation method thereof

A low-temperature magnetic refrigeration and magnetic material technology, applied in the field of materials science, can solve the problems of commercial application limitations and small magnetic entropy, and achieve the effect of significant magnetic entropy change, high magnetic refrigeration capacity, and simple process

Inactive Publication Date: 2012-09-12
HANGZHOU DIANZI UNIV
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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 some paramagnetic metal salts and rare earth intermetallic compounds, but their commercial application is limited due to their relatively small magnetic entropy change

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Step (1). 16.53g (0.104 mole) of rare earth metal Tb, 5.87g (0.1 mole) of metal Ni, 1.08g (0.1 mole) of nonmetal B and 1.20g (0.1 mole) of nonmetal C are uniformly mixed into raw materials;

[0019] 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, clean the furnace chamber with argon gas with a volume purity of 99.9% for 3 times, and then fill it with argon gas with a volume purity of 99.9% to make the pressure in the furnace reach 0.98 standard atmospheric pressure;

[0020] Step (3). The arc discharge in the electric arc furnace heats the raw materials until they are completely melted, stops heating after continuing to heat for 8 seconds, and naturally cools to normal temperature to form lumps;

[0021] 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 5 seconds, stop heating, an...

Embodiment 2

[0026] Step (1). 15.84g (0.102 moles) of rare earth metal Gd, 5.87g (0.1 moles) of metal Ni, 1.08g (0.1 moles) of nonmetal B and 1.20g (0.1 moles) of nonmetal C are uniformly mixed into raw materials;

[0027] Step (2). Put the raw materials in the electric arc furnace, vacuumize the electric arc furnace, and the pressure in the furnace reaches 0.9×10 -2 After Pa, clean the furnace chamber with argon gas with a volume purity of 99.9% for 4 times, and then fill it with argon gas with a volume purity of 99.9% to make the pressure in the furnace reach 0.96 standard atmospheric pressure;

[0028] 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;

[0029] 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 heatin...

Embodiment 3

[0034] Step (1). 17.06g (0.105 moles) of rare earth metal Dy, 5.87g (0.1 moles) of metal Ni, 1.08g (0.1 moles) of nonmetal B and 1.20g (0.1 moles) of nonmetal C were uniformly mixed into raw materials;

[0035] 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, clean the furnace chamber with argon gas with a volume purity of 99.95% for 3 times, and then fill it with argon gas with a volume purity of 99.95% to make the pressure in the furnace reach 0.95 standard atmospheric pressure;

[0036] 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 5 seconds, and naturally cools to normal temperature to form a lump;

[0037] 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 8 seconds, stop heati...

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Abstract

The invention relates to a rare earth-nickel-boron-carbon based magnetic material for low-temperature magnetic refrigeration and a preparation method thereof. The magnetic material has the chemical general formula of RNiBC, wherein R is rare earth metals Gd, Tb, Dy or Er, and the magnetic material has the structure of a tetragonal crystal, and belongs to a P4 / nmm space group. The preparation method comprises the following steps of: firstly, mixing rare earth metals Tb, Gd, Dy or Er and Ni, B and C in proportion into raw materials, putting the raw materials in a smelting container, and repeatedly smelting under the protection of argon, to obtain an alloy cast ingot with even components; sealing the smelted alloy cast ingot in a vacuum quartz container, annealing at high temperature, and quickly cooling to normal temperature, to obtain a finished product. The rare earth-nickel-boron-carbon material provided by the invention not only is large in magnetic entropy change nearby the respective phase-transition temperature, but also is good in magnetic / thermal reversible properties, thereby being an ideal low-temperature refrigeration material.

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 rare earth-nickel-boron-carbon-based magnetic material for low-temperature magnetic refrigeration and a preparation method thereof. Background technique [0002] Magnetic refrigeration is a non-polluting refrigerant material that uses the magnetic entropy effect of magnetic materials (that is, the magnetocaloric effect, also known as the magnetic card effect or magnetocaloric effect) to achieve refrigeration. Magnetic refrigeration is considered a "green" refrigeration method that does not emit any harmful gases such as Freon, and is expected to replace the energy-intensive and environmentally harmful gas compression refrigeration methods currently in use. Compared with the best existing refrigeration system, magnetic refrigeration can consume 20-30% less energy, and neither destroys the ozone layer nor emits greenhouse ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C28/00C21D1/26H01F1/09C09K5/14
Inventor 李领伟霍德璇苏昆朋彭英姿钱正洪
Owner HANGZHOU DIANZI UNIV
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