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A method for preparing SMCO5 permanent magnets doped with Prcu alloys by thermal deformation

A thermal deformation, rare earth permanent magnet technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., to achieve the effect of improving coercive force and good magnetic properties

Active Publication Date: 2018-11-30
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method of doping PrCu alloy has achieved good results in single-phase NdFeB magnets, but in SmCo 5 There is no related report in the magnet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Melting. SmCo 5 The ingots were prepared by a suspension melting furnace; Pr 10 Cu 90 The low melting point alloy is prepared by suspension melting furnace;

[0026] (2) Preparation of SmCo 5 powder. SmCo was processed by high energy ball milling 5 Ingot ball milling into SmCo 5 Amorphous powder;

[0027] (3) Prepare PrCu powder. Rapidly quenching the PrCu alloy to obtain a rapidly quenched thin strip, and then ball milling the PrCu thin strip into PrCu amorphous powder by high-energy ball milling method;

[0028] (4) Mix powder. SmCo was ball milled 5 Powder and PrCu powder are evenly mixed, and PrCu powder accounts for 2wt.% of the total weight;

[0029] (5) Powder molding. Put the evenly mixed powder into the WC cemented carbide mold;

[0030](6) Hot-pressed magnets. Using spark plasma sintering equipment, hot pressing and sintering under the conditions of vacuum, pressure 500MPa, 680°C and heat preservation for 30 seconds, to obtain isotropic nanoc...

Embodiment 2

[0039] (1) Melting. SmCo 5 The ingots were prepared by a suspension melting furnace; Pr 30 Cu 70 The low melting point alloy is prepared by suspension melting furnace;

[0040] (2) Preparation of SmCo 5 powder. SmCo was processed by high energy ball milling 5 Ingot ball milling into SmCo 5 Amorphous powder;

[0041] (3) Prepare PrCu powder. Rapidly quenching the PrCu alloy to obtain a rapidly quenched thin strip, and then ball milling the PrCu thin strip into PrCu amorphous powder by high-energy ball milling method;

[0042] (4) Mix powder. SmCo was ball milled 5 Powder and PrCu powder are evenly mixed, and PrCu powder accounts for 6wt.% of the total weight;

[0043] (5) Powder molding. Put the evenly mixed powder into the WC cemented carbide mold;

[0044] (6) Hot-pressed magnets. Using spark plasma sintering equipment, hot pressing and sintering under the conditions of vacuum, pressure 480MPa, 700°C and heat preservation for 30 seconds, to obtain isotropic nano...

Embodiment 3

[0053] (1) Melting. SmCo 5 The ingots were prepared by a suspension melting furnace; Pr 60 Cu 40 The low melting point alloy is prepared by suspension melting furnace;

[0054] (2) Preparation of SmCo 5 powder. SmCo was processed by high energy ball milling 5 Ingot ball milling into SmCo 5 Amorphous powder;

[0055] (3) Prepare PrCu powder. Rapidly quenching the PrCu alloy to obtain a rapidly quenched thin strip, and then ball milling the PrCu thin strip into PrCu amorphous powder by high-energy ball milling method;

[0056] (4) Mix powder. SmCo was ball milled 5 Powder and PrCu powder are evenly mixed, and PrCu powder accounts for 10wt.% of the total weight;

[0057] (5) Powder molding. Put the evenly mixed powder into the WC cemented carbide mold;

[0058] (6) Hot-pressed magnets. Using spark plasma sintering equipment, hot pressing and sintering under the conditions of vacuum, pressure 500MPa, 700°C and heat preservation for 30 seconds, to obtain isotropic nan...

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Abstract

The invention relates to a method for preparing a SmCo<5> permanent magnet doped with PrCu alloy through a thermal deformation method, belonging to the technical field of magnetic materials. The weight ratio of PrCu alloy powder used for being doped in total powder is 2-15%; the deformation amount of a SmCo<5> magnet is 60-90%; preparation is carried out through thermal deformation by a SPS technology; a PrCu phase is used as an interface phase in a thermal deformation process; two hard magnetic phases including SmCo<5> and SmCo<5> can be isolated; the exchange-coupling interaction between the two hard magnetic phases including SmCo<5> and SmCo<5> can be weakened; the coercive force is increased; after being liquefied, the PrCu phase is dispersed in a crystal boundary in the thermal deformation process, so that thermal deformation of a SmCo<5> phase can be promoted; the performance of the SmCo<5> thermal deformation magnet doped with the PrCu alloy is obviously improved; and the prepared SmCo<5> magnet doped with the PrCu alloy of nanocrystalline has good magnetic property, thermal stability, anti-corrosion property and mechanical property.

Description

technical field [0001] The invention is a SmCo doped PrCu alloy prepared by hot pressing and hot deformation method using spark plasma sintering technology. 5 The method for a rare earth permanent magnet belongs to the technical field of magnetic materials. Background technique [0002] In order to realize the practical application of magnets, it is necessary to prepare block-shaped high-performance anisotropic magnets. The main methods for preparing block-shaped anisotropic magnets include traditional powder metallurgy and hot pressing and heat deformation. SmCo 5 The preparation method of the magnet is generally the traditional powder metallurgy method. The grains of anisotropic magnets prepared by traditional powder metallurgy are all micron-sized. The hot pressing and hot deformation method can prepare nanocrystalline anisotropic magnets. [0003] Nanocrystalline magnets have a single domain size, which can increase the coercive force of the material; there is a stro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/055H01F1/08H01F41/02B22F3/105
CPCB22F3/105H01F1/0555H01F41/0273
Inventor 岳明周德世张东涛刘卫强路清梅吴琼张红国
Owner BEIJING UNIV OF TECH
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