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NdCeFeB anisotropic permanent magnet and preparation method thereof

An anisotropic, permanent magnet technology, used in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of high cost of rare earth alloys and complex manufacturing processes

Inactive Publication Date: 2019-03-15
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing various NdFeB magnets are mostly limited in application due to the complicated manufacturing process or the high cost of the added rare earth alloy.

Method used

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  • NdCeFeB anisotropic permanent magnet and preparation method thereof
  • NdCeFeB anisotropic permanent magnet and preparation method thereof
  • NdCeFeB anisotropic permanent magnet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for preparing NdCeFeB anisotropic permanent magnet, the preparation process is:

[0033] Step 1: Prepare Nd separately by vacuum melting according to the nominal ratio of elements 8 Fe 80 B 5.6 Alloy and Ce 7 Co 3 Alloy, vacuum spinning strip to make thin strip, and then crush to make Nd with a particle size of 150 mesh 8 Fe 80 B 5.6 Alloy powder and 200 mesh Ce 7 Co 3 Alloy powder

[0034] Step two, the Nd 8 Fe 80 B 5.6 Alloy powder and Ce 7 Co 3 The alloy powder is uniformly mixed according to the weight ratio of 95:5;

[0035] Step 3: Put the mixed powder into a mold, use spark plasma sintering for vacuum hot pressing, and hot press sintering at 680°C and 400 MPa for a holding time of 3 minutes to obtain a dense sintered magnet;

[0036] Step four: subject the sintered magnet to a vacuum thermal deformation treatment at a thermal deformation temperature of 650-670° C., a time of 3 minutes, a pressure of 50-60 MPa, and a deformation amount of 60% to obtain a NdCeFeB a...

Embodiment 2

[0038] A method for preparing NdCeFeB anisotropic permanent magnet, the preparation process is:

[0039] Step 1: Prepare Nd by vacuum melting according to the nominal ratio of elements 10 Fe 83 B 6 Alloy and Ce 7 Co 3 Alloy, vacuum spinning strip to make thin strip, and then crush to make the particle size of 200 mesh Nd 10 Fe 83 B 6 Alloy powder and 100 mesh Ce 7 Co 3 Alloy powder

[0040] Step two, the Nd 10 Fe 83 B 6 Alloy powder and Ce 7 Co 3 The alloy powder is uniformly mixed according to the weight ratio of 90:10;

[0041] Step 3: Put the mixed powder into a mold, use spark plasma sintering to perform vacuum hot pressing, and heat-press sintering at 700°C and 800 MPa for 5 minutes to obtain a dense sintered magnet;

[0042] Step four: subject the sintered magnet to vacuum thermal deformation treatment at a thermal deformation temperature of 700-720° C., a time of 3 min, a pressure of 50-60 MPa, and a deformation amount of 56% to obtain a NdCeFeB anisotropic permanent magnet.

Embodiment 3

[0044] A method for preparing NdCeFeB anisotropic permanent magnet, the preparation process is:

[0045] Step 1: Prepare Nd by vacuum melting according to the nominal ratio of elements 14 Fe 80 Zr 2 B 6.2 Alloy and (La, Ce) 7 Cu 3 Alloy, vacuum spinning strip to make thin strip, and then crush to make Nd particle size 80 mesh 10 Fe 83 B 6 Alloy powder and 100 mesh (La, Ce) 7 Cu 3 Alloy powder

[0046] Step two, the Nd 10 Fe 83 B 6 Alloy powder and (La, Ce) 7 Cu 3 The alloy powder is uniformly mixed at a weight ratio of 92:8;

[0047] Step 3: Put the mixed powder into a mold, use spark plasma sintering for vacuum hot pressing, and hot press sintering at 660°C and 1000 MPa for 6 minutes to obtain a dense sintered magnet;

[0048] Step four: subject the sintered magnet to a vacuum thermal deformation treatment at a thermal deformation temperature of 730-750° C., a time of 3 minutes, a pressure of 50-60 MPa, and a deformation amount of 58% to obtain a NdCeFeB anisotropic permanent magnet. ...

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Abstract

The invention discloses an NdCeFeB anisotropic permanent magnet. The NdCeFeB anisotropic permanent magnet comprises an RXB component and a YZ component; in parts by quantity, the ratio of R to X to Bis 8-14: 80-86: 5.6-6.5 and the ratio of Y to Z is 7: 3; in parts by weight, the ratio of RXB to YZ is 90-95: 5-10; B is boron; R is at least one of Nd and Pr; X is a transition element combination formed by Fe, Zr, Nb and Ga; when the part of X by weight is 80-86, the transition element combination comprises 0-2 parts of Zr, 0-3 parts of Nb, 0-9 parts of Co, 0-1 part of Ga and the balance of Fe;Y is Ce or a combination of Ce and La; and Z is Cu or Co. The invention furthermore discloses a method for preparing the NdCeFeB anisotropic permanent magnet. According to the method, RXB alloy powderand YZ alloy powder are separately prepared, and the RXB alloy powder and the YZ alloy powder are uniformly mixed and then thermally deformed by hot pressing sintering. The obtained NdCeFeB magnet has excellent magnetic properties, and utilizes Ce or LaCe with relativelow low cost to replace the rare earth element Nd, thereby reducing the material cost and providing a good application prospect.

Description

Technical field [0001] The invention relates to a neodymium iron nitrogen magnetic material, in particular to a NdCeFeB anisotropic permanent magnet and a preparation method thereof. Background technique [0002] Nd-Fe-B Nd-Fe-B is widely used because of its excellent room temperature magnetic properties and is called "magnet king". However, this type of magnet is not stable enough, resulting in the performance of the Nd-Fe-B permanent magnet produced by the existing manufacturing method is far lower than the theoretical value, especially in terms of magnet orientation and coercivity, the product performance is difficult to further improve. At present, there are some manufacturing methods in the industry to obtain products with better magnet orientation and magnetic properties by adding other alloys. For example, patent document CN 103996522 B discloses a Ce-containing neodymium iron boron rare earth permanent magnet and a preparation method thereof. The performance of the obtai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0273
Inventor 马毅龙刘青沈倩何金芝银学国邵斌郭东林
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY