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A kind of method for preparing the prco5 permanent magnet of doping prcu alloy by thermal deformation method

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

Active Publication Date: 2018-08-14
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 PrCo 5 There is no related report in the magnet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Melting. PrCo 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;

[0027] (2) Preparation of PrCo 5 powder. PrCo was processed by high energy ball milling 5 Ingot ball milling into PrCo 5 Amorphous powder;

[0028](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;

[0029] (4) Mix powder. PrCo was ball milled 5 Powder and PrCu powder are evenly mixed, and PrCu powder accounts for 2wt.% of the total weight;

[0030] (5) Powder molding. Put the evenly mixed powder into the WC cemented carbide mold;

[0031] (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

[0040] (1) Melting. PrCo 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;

[0041] (2) Preparation of PrCo 5 powder. PrCo was processed by high energy ball milling 5 Ingot ball milling into SmCo 5 Amorphous powder;

[0042] (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;

[0043] (4) Mix powder. PrCo was ball milled 5 Powder and PrCu powder are evenly mixed, and PrCu powder accounts for 6wt.% of the total weight;

[0044] (5) Powder molding. Put the evenly mixed powder into the WC cemented carbide mold;

[0045] (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

[0054] (1) Melting. PrCo 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;

[0055] (2) Preparation of PrCo 5 powder. PrCo was processed by high energy ball milling 5 Ingot ball milling into PrCo 5 Amorphous powder;

[0056] (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;

[0057] (4) Mix powder. PrCo was ball milled 5 Powder and PrCu powder are evenly mixed, and PrCu powder accounts for 10wt.% of the total weight;

[0058] (5) Powder molding. Put the evenly mixed powder into the WC cemented carbide mold;

[0059] (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 PrCo<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 PrCo<5> magnet is 60-90%; preparation is carried out through thermal deformation; a PrCu phase is used as an interface phase in a thermal deformation process; two hard magnetic phases including PrCo<5> and PrCo<5> can be isolated; the exchange-coupling interaction between the two hard magnetic phases including PrCo<5> and PrCo<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 PrCo<5> phase can be promoted; the performance of the PrCo<5> thermal deformation magnet doped with the PrCu alloy is obviously better than that of a non-doped PrCo<5> thermal deformation magnet; and the prepared PrCo<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 PrCo 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. The preparation method of sintered 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 strong ...

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 张东涛周德世岳明刘卫强路清梅吴琼张红国
Owner BEIJING UNIV OF TECH
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