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Ultra-large rare earth permanent magnet and preparation method thereof

A rare-earth permanent magnet, ultra-large technology, applied in the direction of magnetic objects, inductors/transformers/magnet manufacturing, magnetic materials, etc., can solve problems such as magnet cracks, stress release, and green body difficulty in magnetization saturation, and promote grain boundary phase thickness Effect of increasing, reducing cracks or cracks, releasing stress concentration

Active Publication Date: 2019-04-05
NINGBO SHUOTENG NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional process generally adopts the method of directly preparing super-large magnets. The disadvantage is that the forming press is required to provide greater output pressure to ensure that the green body of the magnet has sufficient density and strength.
The direct preparation method also has high requirements for the magnetic field orientation ability. If the magnetic field strength provided is insufficient, it will be difficult for the green body to be magnetized and saturated, which will seriously affect the performance of the magnet.
In addition, during the cooling process of super-large magnets after sintering, due to the large volume of the magnets, it is difficult to release the stress, which is easy to cause cracks or cracks in the magnets

Method used

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  • Ultra-large rare earth permanent magnet and preparation method thereof
  • Ultra-large rare earth permanent magnet and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] An ultra-large rare earth permanent magnet and a preparation method thereof include the following steps:

[0026] (1) Provide two pieces of magnetic field orientation green body, the specification is 71×42×70.5, the unit is mm, the pressure height is 42, and the magnetic field orientation direction is 70.5;

[0027] (2) Provide quick-setting sheet rare earth alloy, the composition of each element, by mass percentage, is La 0.36 Ce 0.53 PR 17.32 Nd 70.67 Al 0.75 Fe 9.8 co 0.13 B 0.44 , the thickness of the quick-setting sheet is 2.8 mm; by covering the quick-setting sheet evenly between the splicing surfaces of the green body, the two green bodies are spliced ​​together, and the splicing direction is the magnetic field orientation direction (parallel to the 70.5 side length direction), and then packaged and isostatic pressing;

[0028] (3) Vacuum sintering and tempering heat treatment are carried out on the spliced ​​green body after isostatic pressing, wherein t...

Embodiment 2

[0031] An ultra-large rare earth permanent magnet and a preparation method thereof include the following steps:

[0032] (1) Provide two pieces of magnetic field orientation green body, the specification is 71×45×70.5, the unit is mm, the pressure height is 45, and the magnetic field orientation direction is 70.5;

[0033] (2) Provide quick-setting sheet rare earth alloy, the composition of each element, by mass percentage, is Pr 17.5 Nd 73 Cu 4.8 Al 11.5 Ga 3.2 , the thickness of the quick-setting sheet is 0.32 mm; the two green sheets are spliced ​​together by evenly covering the splicing surfaces of the green sheets with the quick-setting sheet. direction), followed by encapsulation and isostatic pressing;

[0034] (3) Vacuum sintering and tempering heat treatment are carried out on the spliced ​​green body after isostatic pressing, wherein the vacuum sintering temperature is 1035°C, and the vacuum degree is 5×10 -2 Pa, the time is 5 hours; tempering heat treatment is...

Embodiment 3

[0037] An ultra-large rare earth permanent magnet and a preparation method thereof include the following steps:

[0038] (1) Provide three pieces of magnetic field orientation green body, the size is 44×39.5×52, the unit is mm, the pressure height is 39.5, and the magnetic field orientation direction is 52;

[0039] (2) Provide rare earth alloy powder, with an average particle size of 2.9 microns, and the composition of each element, by mass percentage, is Nd 42 Dy31.5 Ho 5.3 Fe 8.2 Cu 3.6 al 9.4 ;By uniformly covering the splicing surfaces of the green bodies with the rare earth alloy powder, splicing the three green bodies together, the thickness of the covering layer is about 0.3 mm, and the splicing direction is the vertical magnetic field orientation direction (parallel to the direction of the 44 side lengths), and then Encapsulation and isostatic pressing;

[0040] (3) Vacuum sintering and tempering heat treatment are carried out on the spliced ​​green body after is...

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Abstract

The invention discloses an ultra-large rare earth permanent magnet and a preparation method thereof. The ultra-large rare earth permanent magnet is composed of at least two monomers (single magnets) bonded through RaMbBc rare earth alloy, and the main phase of the magnet is Re2T14B1 grains, wherein R and Re are rare earth elements, M is at least one of Fe, Co, Al, Cu, and Ga, T is a transition metal element, and B is a boron element; a is greater than or equal to 50, b is less than or equal to 30, and c is less than or equal to 0.3; and the bonding direction of the magnets is parallel or perpendicular to the orientation direction of the magnetic field. The preparation method for the rare earth permanent magnet comprises the steps of: (1) providing magnetic field oriented green bodies; (2)splicing at least two green bodies through the thin layer rare earth alloy for isostatic pressing; and (3) preparing the rare earth permanent magnet by vacuum sintering and tempering heat treatment. The invention utilizes rare earth alloy bonding and high temperature sintering to connect a plurality of magnets into a body, and provides a preparation method of an ultra-large fast magnet. In addition, the rare earth alloy diffuses into the magnet during sintering and tempering, thereby increasing the coercive force of the magnet.

Description

technical field [0001] The invention belongs to the technical field of preparation of rare earth permanent magnet materials, in particular to an ultra-large rare earth permanent magnet and a preparation method thereof. Background technique [0002] NdFeB magnets have excellent magnetic properties and are widely used in automotive motors, electric bicycles, computer hard disks, electric tools and other products, as well as audio equipment, communication products, medical equipment, home appliances, magnetic separation equipment and other fields, and make some highly The application of integrated products becomes possible, such as hybrid vehicles, electric vehicles, windmills for power generation, etc. NdFeB permanent magnet materials have high magnetic energy product, high coercive force, high cost performance and good machining performance, and play an important role in the high-tech field of today's society. [0003] Generally, the sintering process is used to prepare high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/053H01F41/02
CPCH01F1/0536H01F41/0253
Inventor 吕忠山靳朝相邹永博邹宇钦李安华冯海波
Owner NINGBO SHUOTENG NEW MATERIAL CO LTD
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