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Block rare earth gadolinium-based composite amorphous material and preparation thereof

An amorphous material, bulk technology

Inactive Publication Date: 2008-12-24
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing studies have shown that Gd-Co-Al bulk amorphous alloys can currently form cylinders with a maximum diameter of 5 mm (Gd 60 co 25 Al 15 ), which limits the application of this alloy

Method used

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  • Block rare earth gadolinium-based composite amorphous material and preparation thereof
  • Block rare earth gadolinium-based composite amorphous material and preparation thereof
  • Block rare earth gadolinium-based composite amorphous material and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1Gd 55 co 15 Al 26 Ge 4 Preparation and Thermal Stability of (x=4) Alloy

[0031] The raw materials of gadolinium, cobalt, aluminum and germanium with a purity greater than 99.9% (mass fraction) are classified as Gd 55 co 15 Al 26 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 10 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-ray diffr...

Embodiment 2

[0032] Example 2Gd 55 co 15 Al 25 Ge 5 Preparation and Thermal Stability of (x=5) Alloy

[0033] The raw materials of gadolinium, cobalt, aluminum and germanium with a purity greater than 99.9% (mass fraction) are classified as Gd 55 co 15 Al 25 Ge 5 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 10 mm. Metallographic observation shows that the microstructure of the alloy is based on a large amorphous matrix, containing a small amount of primary crystal phase and the primary...

Embodiment 3

[0034] Example 3 Gd 55 co 15 Al 20 Ge 10 Preparation and Thermal Stability of (x=10) Alloy

[0035] 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 10 mm. Metallographic observation shows that the microstructure of the alloy is based on a large amorphous matrix, containing a small amount of primary crystal phase and the prima...

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Abstract

The invention provides a bulk rare earth gadolinium-based composite amorphous material and a preparation method thereof, and belongs to the metal material technical field. A chemical general formula is Gd55Co15Al30-xGex, wherein, x is more than 0 and less than or equal to 10. A main material is a bulk amorphous alloy body which is melted by Gd, Co, Al and Ge; and the main material also contains a Gd5Ge3 crystal primary phase. The preparation method comprises the following steps that: firstly, ingredients are smelted by an electric arc furnace to produce a master alloy of Gd55Co15Al30-xGex, and then the master alloy is subjected to suction casting and molding by a copper mold suction casting method to achieve a composite material which has the largest diameter of 10 mm and uses a bulk amorphous alloy as the substrate. The bulk rare earth gadolinium-based composite amorphous material provided by the invention has good thermal stability and application prospect in the aspects of a magnetic cooling functional material and a structural material. The method has the advantages of simple process, easy control of a material structure, etc.

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 material and a preparation method thereof. technical background [0002] Compared with crystalline materials, amorphous materials are another structural state of solid matter. Amorphous materials include traditional glass, amorphous semiconductors, polymers, and amorphous metals and alloys. Amorphous substances are structurally disordered substances that do not have the periodic structure of crystalline substances. Under rapid cooling conditions, the atoms in the melt do not have time to form ordered crystals, but freeze the atoms arranged randomly in the liquid state to form a relatively stable disordered structure within a certain temperature range. In an amorphous solid, the arrangement of atoms is short-range ordered and long-range disordered. The special atomic str...

Claims

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Application Information

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IPC IPC(8): C22C45/00C22C1/03B22D18/06
Inventor 祖小涛付浩余华军
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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