Method and device special for improving performance of sintered Nd-Fe-B magnets

A special device, neodymium iron boron technology, applied in the direction of magnetic objects, magnetic materials, inductors/transformers/magnets, etc., can solve the problems of high oxygen and nitrogen content of magnets, reduced magnet performance, green body damage, etc., to achieve processing accuracy High, reduced machining volume, and reduced magnetic loss

Active Publication Date: 2018-11-16
YANTAI DONGXING MAGNETIC MATERIALS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention mainly solves the problem that the existing NdFeB magnet preparation method will lead to large deviations in magnet composition and magnetic properties, and traditional mechanical processing will cause magnet performance degradation. The invention can also reduce the difficult-to-recycle waste powder generated during magnet processing At the same time, it solves the problem that the complete processing of the green body into a finished product is easy to cause damage to the green body, and the oxygen and nitrogen content in the magnet after sintering is high and the performance is reduced.

Method used

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  • Method and device special for improving performance of sintered Nd-Fe-B magnets
  • Method and device special for improving performance of sintered Nd-Fe-B magnets
  • Method and device special for improving performance of sintered Nd-Fe-B magnets

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Embodiment 1

[0030] Example 1, the size of the produced product is: 10.0mm (non-oriented surface)*6.5mm (oriented surface)*8.0mm (pressed surface), and the non-oriented surface is processed into a finished product corresponding to the green state using the special device of the present invention The size, non-oriented face and pressed face of the sinter-aged blank are machined. Specific steps are as follows:

[0031]The magnetic powder with an average particle size X50=4.0μm is pressed into a green body with a press under the condition of a 2.0T magnetic field, and then isostatically pressed at 150Mpa. The density after isostatic pressing is about 4.5g / cm3, and the green body size is 79.3mm ( Non-oriented surface)*38.2mm (oriented surface)*44.8mm (pressed surface), the unit weight of the green body is 610.7g; the magnetic powder composition is PrNd 31.10wt.%, Dy1.50wt.%, B0.95wt.%, Co 1.05 wt .%, Al 0.51wt.%, Cu 0.15wt.%, Ga 0.12wt.%, Ti 0.11wt.%, the balance is Fe and unavoidable impurit...

Embodiment 2

[0034] Example 2, the product size is: 10.0mm (non-oriented surface) * 6.5mm (oriented surface) * 8.0mm (pressed surface), in the green state, the orientation surface and the non-oriented surface are processed into finished products with special equipment shape and size. Specific steps are as follows:

[0035] The magnetic powder with an average particle size X50=4.0μm is pressed into a green body with a press under the condition of a 2.0T magnetic field, and then isostatically pressed at 400Mpa. The density after isostatic pressing is about 5.5g / cm3, and the green body size is 75.7mm ( Non-oriented surface)*33.9mm (oriented surface)*43.2mm (pressed surface), the unit weight of the green body is 609.7g; the magnetic powder composition is PrNd 31.10wt.%, Dy1.50wt.%, B0.95wt.%, Co 1.05 wt .%, Al 0.51wt.%, Cu 0.15wt.%, Ga 0.12wt.%, Ti 0.11wt.%, the balance is Fe and unavoidable impurity elements; place the green body on the base of the green body fixing tool, Step 1: Select the...

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Abstract

The invention discloses a method and device special for improving the performance of sintered Nd-Fe-B magnets. The method is characterized in that one or two of an orientation surface, a non-orientation surface and a pressing surface of green billets prepared through molding of a press and isostatic pressing are processed into finished product shapes and corresponding sizes through a special device, then the green billets are subjected to normal sintering and aging, and the obtained magnets are processed into finished products through traditional mechanical processing. The special device is composed of a reciprocating cutting device (A), a cutting tool (B), green billet fixing tool (C) and a reciprocating lifting mechanism (D). The deviation of sintered magnet composition and magnet performance can be reduced, magnet performance loss in traditional mechanical processing is reduced, and the overall magnet performance of the magnets is thus improved. Meanwhile, damage to the green billets in the green billet processing process can be reduced, the ratio of waste powder which is difficult to recycle and generated in the processing process is reduced, and the comprehensive utilization rate of magnet powder is improved.

Description

Technical field: [0001] The invention relates to the technical field of sintered NdFeB permanent magnets, in particular to a method and special device for improving the performance of sintered NdFeB magnets. Background technique: [0002] For large-sized NdFeB magnets, during the sintering and aging process, due to the liquid phase sintering rare earth volatilization, capillary tension, etc., composition segregation is easy to occur, that is, the composition at different positions of the blank, especially the total amount of rare earth Will be different, resulting in non-uniform magnetic properties. The problem of uneven magnetic composition and magnetic properties is more serious for magnets with larger single blank size and smaller grain size. In addition, traditional NdFeB products are generally processed into finished products by mechanical processing after magnet sintering and heat treatment. The processing technology involved includes cutting, grinding, drilling, cham...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0576H01F41/0266H01F1/0577H01F41/0273H01F41/0253H01F1/0556H01F1/0557H01F1/057
Inventor 陈秀雷彭众杰柳光洋朱晓男
Owner YANTAI DONGXING MAGNETIC MATERIALS INC
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