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Magnetic rare earth-gadolinium refrigerating alloy

A magnetic refrigeration and rare earth technology, applied in the direction of electrical components, circuits, thermoelectric devices, etc., can solve the problem of adjusting the Curie temperature, etc., and achieve the effect of low cost and giant magnetocaloric effect

Inactive Publication Date: 2002-01-23
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still problems in this series of alloys, such as the need to further improve the magnetocaloric effect and adjust the Curie temperature.

Method used

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  • Magnetic rare earth-gadolinium refrigerating alloy
  • Magnetic rare earth-gadolinium refrigerating alloy
  • Magnetic rare earth-gadolinium refrigerating alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: Rare earth gadolinium-based magnetic refrigeration alloy (gadolinium silicon germanium tin) of the present invention

[0016] General chemical formula: Gd 5 Si x Ge y sn 4-x-y , where X=1.9, Y=2.0,

[0017] Chemical formula: Gd 5 Si 1.9 Ge 2.0 sn 0.1

[0018] The manufacturing method is to prepare about 20 grams of raw materials according to the atomic ratio of Gd, Si, Ge, and Sn in the ratio of 5:1.9:2.0:0.1, and put them into a non-consumable electric arc furnace with a mechanical pump and an oil diffusion pump. In a copper crucible, evacuate to a pressure less than 2×10 -3 Pa, fill the vacuum chamber with high-purity argon gas of more than 99.999% to flush the vacuum chamber once, and then evacuate to a pressure of less than 2×10 -3 Pa, filled with 99.999% or more high-purity argon slightly less than 1 atm as the melting protective gas, and finally arc-started and smelted at a melting temperature of 1800-1850°C, repeatedly fl...

Embodiment 2

[0023] Embodiment 2: Rare earth gadolinium-based magnetic refrigeration alloy (gadolinium silicon germanium tin) of the present invention

[0024] General chemical formula: Gd 5 Si x Ge y sn 4-x-y , where X=1.8, Y=2.0,

[0025] Chemical formula: Gd 5 Si 1.8 Ge 2.0 sn 0.2

[0026] The manufacturing method is to prepare about 20 grams of raw materials according to the atomic ratio of Gd, Si, Ge, and Sn in the ratio of 5: 1.8: 2.0: 0.2, and put them into a non-consumable electric arc furnace. The smelting process is the same as in Example 1. .

[0027] Get the spherical particle of alloy of the present invention about 0.1 gram, measure 260K, 265K, 270K, 275K, 280K five isothermal magnetization (M-μ0H) curves respectively near Curie point on superconducting quantum magnetometer, see figure 2 .

[0028] Depend on figure 2 It can be seen that the isothermal magnetization behavior of the alloy of the present invention near the Curie point has shown a s...

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Abstract

The magnetic RE-Gd refrigerating alloy with grand magnetothermal effect has the general formula of Gd5SiXGeYSn4-x-y, where X is 0-4, Y is 0-4, and X+Y is 0-4. The alloy material has the component of cheap Sn and thus lower cost, has grand magnetothermal effect and Curie temperature changeable with components, and is used as malgnetic refrigerating medium material.

Description

technical field [0001] The invention relates to a rare earth alloy, in particular to a rare earth gadolinium-based magnetic refrigeration alloy. Background technique [0002] In recent years, due to the increasingly serious destruction of the atmospheric ozone layer by the traditional compression refrigeration Freon working medium, which threatens the survival and safety of human beings, coupled with the low efficiency of compression refrigeration and high energy consumption, the traditional refrigeration technology is facing difficulties. Magnetic refrigeration technology has the characteristics of high efficiency, energy saving and no environmental pollution. It is a typical high-tech "green" refrigeration technology. The basic principle of magnetic refrigeration is to use the magnetocaloric effect (or magnetic card effect, Magnetocaloric Effect) of the magnetic refrigeration material, that is, the magnetic refrigeration material releases heat to the outside when it is iso...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C28/00H01L37/00
Inventor 涂铭旌陈云贵陈远富唐定骧
Owner SICHUAN UNIV