Block gadolinium-based composite amorphous magnetic cooling material and preparation thereof

A magnetic refrigeration material and bulk technology, applied in the field of metal materials, can solve the problems such as the research on the magnetocaloric effect of bulk amorphous alloys, which is in the ascendant, and achieve the effects of easy control of the microstructure of the material, simple preparation process, and excellent mechanical properties.

Inactive Publication Date: 2009-04-22
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the research on crystalline magnetic refrigeration materials, the r

Method used

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  • Block gadolinium-based composite amorphous magnetic cooling material and preparation thereof
  • Block gadolinium-based composite amorphous magnetic cooling material and preparation thereof
  • Block gadolinium-based composite amorphous magnetic cooling material and preparation thereof

Examples

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Embodiment 1

[0035] Example 1 Gd 60 co 26 Al 10 Ge 4 Preparation and Magnetocaloric Properties of (x=4) Alloy

[0036] The raw materials of gadolinium, cobalt, aluminum and germanium with a purity greater than 99.9% (mass fraction) are classified as Gd 60 co 26 Al 10 Ge 4 Chemical formula weighing, put the prepared raw materials into a non-consumable vacuum electric arc furnace, and evacuate to 3×10 -5 Torr or above; after cleaning 1-2 times with high-purity argon gas cleaning method, under the protection of high-purity argon gas at 1 atmospheric pressure, it is turned over and smelted repeatedly for 4-6 times to make a master alloy; put the master alloy smelted according to the above steps into In the suction-casting copper crucible, the alloy is melted and suction-cast into a columnar sample with a diameter of 3 mm. The metallographic observation shows that the microstructure of the alloy is characterized by a large amorphous matrix and a small amount of primary crystal phase. X...

Embodiment 2

[0037] Example 2 Gd 60 co 26 Al 6 Ge 8 Preparation and Magnetocaloric Properties of (x=8) Alloy

[0038] The raw materials of gadolinium, cobalt, aluminum and germanium with a purity greater than 99.9% (mass fraction) are classified as Gd 60 co 26 Al 6 Ge 8 Chemical formula weighing, put the prepared raw materials into a non-consumable vacuum electric arc furnace, and evacuate to 3×10 -5 Torr or above; after cleaning 1-2 times with high-purity argon gas cleaning method, under the protection of high-purity argon gas at 1 atmospheric pressure, it is turned over and smelted repeatedly for 4-6 times to make a master alloy; put the master alloy smelted according to the above steps into In the suction-casting copper crucible, the alloy is melted and suction-cast into a columnar sample with a diameter of 3 mm. The metallographic observation shows that the microstructure of the alloy is characterized by a large amorphous matrix and a small amount of primary crystal phase. X-r...

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Abstract

The invention provides a massive gadolinium-based composite amorphous magnetic frigorific material and a preparation method thereof, which belong to the field of metal material technology. The massive gadolinium-based composite amorphous magnetic frigorific material has a chemical general formula: Gd60Co26Al14-xGex, wherein x is more than 0 and less than or equal to 10. The main material is a massive amorphous alloy body formed through fusing Gd, Co, Al and Ge and also comprises a Gd5Ge3 crystal primary phase. In a magnetic field of between 0 and 5T, Curie temperature converted from a high-temperature paramagnetic state to a low-temperature ferromagnetic state is between 100 and 200 K; the largest magnetic entropy change of the Curie temperature is more than 7 J/kgK; and the relative refrigerating output is more than 700 J/kg. The preparation method comprises the following steps: firstly, ingredients are subjected to electric arc melting to obtain a Gd60Co26Al14-xGex master alloy; and secondly, a suction casting mould is obtained by a copper mould suction casting method. The massive gadolinium-based composite amorphous magnetic frigorific material has continuous and adjustable Curie temperature, equivalent magnetic entropy change with rare-earth gadolinium, and higher relative refrigerating output which is at least 35 percent higher than that of gadolinium, and is an ideal magnetic frigorific material. The method has the advantages of simple process, easy control of material structure and the like.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and relates to a magnetic composite amorphous alloy material, in particular to a gadolinium-based composite amorphous magnetic refrigeration material and a preparation method thereof. technical background [0002] Room temperature magnetic refrigeration has significant energy-saving and green advantages, and its power consumption is only 1 / 2-1 / 5 of traditional gas refrigeration, which will largely become the traditional gas refrigeration that ranks first in power consumption in all industries alternative technology. Due to the discovery of giant magnetocaloric effect (GMEC) alloys, permanent magnets can be used to replace superconducting magnets to generate external fields, and the manufacturing difficulty and cost are greatly reduced. At present, both the United States (Ames Laboratory and Aerospace Corporation) and Japan (Kyushu Electric Power and Toshiba Corporation) have developed ro...

Claims

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Application Information

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IPC IPC(8): C22C45/00C22C1/02
Inventor 祖小涛付浩余华军
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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