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Preparation method of anisotropic samarium cobalt-based nanocrystalline rare earth permanent magnet

A rare earth permanent magnet, anisotropic technology, used in permanent magnets, inductance/transformer/magnet manufacturing, electrical components, etc., can solve the problems of insufficient grain size, difficult to obtain anisotropy, and complicated operation.

Active Publication Date: 2012-04-04
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in SmCo-based nanocrystalline permanent magnet alloys, the acquisition of anisotropy has been a difficulty due to the absence of Nd-rich grain boundary phases similar to those in NdFeB alloys.
The latest research shows that for SmCo with the strongest anisotropy field in SmCo-based permanent magnet alloys 5 Alloys, requiring up to 90% severe thermal deformation to obtain a certain degree of anisotropy, but thermally deformed magnets have lamellar grains with a thickness of 100-200nm and a length of 500-800nm, and the grain size is not fine enough
Moreover, severe thermal deformation has high requirements on the mold and consumes a lot of energy. Before that, hot pressing is required, and the operation is more complicated

Method used

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  • Preparation method of anisotropic samarium cobalt-based nanocrystalline rare earth permanent magnet
  • Preparation method of anisotropic samarium cobalt-based nanocrystalline rare earth permanent magnet
  • Preparation method of anisotropic samarium cobalt-based nanocrystalline rare earth permanent magnet

Examples

Experimental program
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Effect test

Embodiment 1

[0053] Anisotropic SmCo 6.6 Ti 0.4 Taking the preparation of nanocrystalline rare earth permanent magnets as an example, the specific steps are as follows:

[0054] Step A: prepare a master alloy of target composition.

[0055] According to SmCo 6.6 Ti 0.4 , a master alloy of the target composition was made with Sm with a purity of 99.95%, Co with a purity of 99.9%, and Ti with a purity of 99.9%. The total mass of the alloy is 30g, Sm 8.0770g (8.7232g with 8wt.% burning loss), Co2 0.8941g, Ti 1.0288g. Wherein the purity is the mass percentage purity.

[0056] Step B: Melting the ingot.

[0057] The SmCo prepared in step A 6.6 Ti 0.4 The master alloy is placed in the water-cooled copper crucible of the vacuum arc melting furnace, and the vacuum degree of the vacuum chamber is adjusted to 3×10 -3 Pa, then filled with high-purity argon to 0.5×10 5Pa; under the conditions of working voltage 40V and working current 700A, arc melting was carried out for 60s. After the allo...

Embodiment 2

[0070] Step A: prepare a master alloy of target composition.

[0071] According to SmCo 6.6 Ti 0.4 , with a purity of 99.95% Sm, 99.9% Co, and 99.9% Ti elemental elements to prepare a master alloy of the target composition. The total mass of the alloy is 40g, Sm 10.7694g (11.6310g with 8wt.% burning loss), Co27.8589g, Ti 1.3717g. Wherein the purity is the mass percentage purity.

[0072] Step B: Melting the ingot.

[0073] The SmCo prepared in step A 6.6 Ti 0.4 The master alloy is placed in the water-cooled copper crucible of the vacuum arc melting furnace, and the vacuum degree of the vacuum chamber is adjusted to 2×10 -3 Pa, then filled with high-purity argon to 0.2×10 5 Pa; Under the condition of working voltage 30V and working current 630A, the arc is smelted for 20s. After the alloy elements are completely melted, the arc is broken to form an alloy ingot; the alloy ingot is turned over and smelted 4 times repeatedly to obtain SmC with uniform composition. 6.6 Ti ...

Embodiment 3

[0086] Step A: prepare a master alloy of target composition.

[0087] According to SmCo 6.1 Si 0.9 , with a purity of 99.95% of Sm, 99.9% of Co, and 99.9% of Si elemental elements to prepare a master alloy of the target composition. The total mass of the alloy is 41g, Sm 11.5225g (12.3291g with 7wt.% burning loss), Co27.5488g, Si 1.9370g. Wherein the purity is the mass percentage purity.

[0088] Step B: Melting the ingot.

[0089] The SmCo prepared in step A 6.1 Si 0.9 The master alloy is placed in the water-cooled copper crucible of the vacuum arc melting furnace, and the vacuum degree of the vacuum chamber is adjusted to 4×10 -3 Pa, then filled with high-purity argon to 0.8×10 5 Pa; under the condition of working voltage 45V and working current 750A, the arc melting is 70s. After the alloying elements are completely melted, the arc is broken to form an alloy ingot; the alloy ingot is turned over and smelted 4 times repeatedly to obtain SmCo with uniform composition. ...

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Abstract

The invention belongs to the new powder metallurgy process, and specifically to a special method for preparing an anisotropic SmCo based nanocrystalline rare earth permanent magnet. The invention breaks through the nano-crystal particle tropism problem of the SmCo based nanocrystalline rare earth permanent magnet nanocrystalline grain and obtains the nanocrystalline permanent magnet with obvious crystallographic anisotropism and magnetic anisotropism. The invention obtains the anisotropic nanocrystalline rare earth permanent magnet by the operations of adopting surfactant to auxiliary high-energy ball mill, orientating the pulse magnetic field, cold isostatic pressing and low-temperature pressurizing and sintering. The SmCo based nanocrystalline rare earth permanent magnet with obvious anisotropism can be obtained after sintering without any treatment.

Description

technical field [0001] The invention is a method for preparing anisotropic samarium-cobalt (SmCo)-based nanocrystalline rare earth permanent magnets by adopting a novel powder metallurgy method. Background technique: [0002] As an important functional material, permanent magnet materials have been widely used in computer technology, microwave communication technology, automobile industry, aviation industry, automation technology, instrument technology and other important fields. The development of permanent magnet materials has gone through several development stages such as carbon steel, AlNiCo alloy, hard ferrite, and rare earth permanent magnet alloy. [0003] Nanocrystalline permanent magnet alloys have a high coercive force due to the size effect of grains, which has been a research hotspot. For permanent magnets, high remanent magnetization is the key to obtain high energy product, and to obtain high remanent magnetization, it is necessary to prepare permanent magnet...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F7/02B22F9/04B22F3/16
Inventor 蒋成保安士忠张天丽
Owner BEIHANG UNIV
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