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High-resistivity rare earth iron series R-Fe-B magnet and manufacturing method thereof

A high-resistivity, r-fe-b technology, applied in the manufacture of inductors/transformers/magnets, magnetic objects, circuits, etc., can solve problems such as the decline in magnetic properties of magnets, and achieve reduced eddy current loss, improved efficiency, and eddy current loss Reduced effect

Active Publication Date: 2014-11-26
EARTH PANDA ADVANCE MAGNETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, while the above-mentioned various magnets increase the resistivity of the magnets, they also cause a significant decline in the magnetic properties of the magnets, especially for high-power rotating machines.

Method used

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  • High-resistivity rare earth iron series R-Fe-B magnet and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] a. Use grade 40UH, composition: Nd26.5Dy5.5B1.03Nb0.1Al0.1Col.0Cu0.1Ga0.1Fe65.57 (mass percentage) smelted neodymium iron boron alloy cast piece, using hydrogen crushing and jet milling Powder process, made into raw material fine powder with an average particle size of 3.2 microns for use.

[0016] b. Feed the material into the hopper to make a blank of 40*40*25 (orientation size) square size. When the mold cavity is filled with powder with a height of 2-4mm, spray a layer of dysprosium oxide with an average particle size of 2.5 microns through an argon spray gun The micropowder is reciprocally charged in this way, oriented in a magnetic field with a magnetic field strength of 2.0T, and pressed into shape to obtain a compact.

[0017] c. After isostatic pressing, the compact is placed in a vacuum sintering furnace, sintered at 1030℃×4hr and then air-cooled, and then tempered at 900℃×3hr and 520℃×5hr to obtain sintering magnet. The measured average magnetic performance inde...

Embodiment 2

[0023] a. Use the formula 40UH: Nd26.5Dy5.5B1.03Nb0.1Al0.1Col.0Cu0.1Ga0.1Fe65.57 (mass percentage content) to smelt NdFeB alloy cast pieces, and use hydrogen crushing and jet milling to make powder Process, prepare raw material powder with an average particle size of 3.2 microns for use.

[0024] b. Add 310 grams into the hopper to make a 40*40*25 (orientation size) block size blank. When the cavity is filled with powder with a height of 2-4mm, spray a layer of dysprosium fluoride with an average particle size of 2.5 microns. The micropowder is reciprocally charged in this way, oriented in a magnetic field with a magnetic field strength of 2.0T, and pressed into shape to obtain a compact.

[0025] c. After isostatic pressing, the compact is placed in a vacuum sintering furnace, sintered at 1030℃×4hr and then air-cooled, and then tempered at 900℃×3hr and 520℃×5hr to obtain sintering magnet. The measured average magnetic performance indexes of the prepared magnet and the meas...

Embodiment 3

[0027] a. Use the formula 40UH: Nd26.5Dy5.5B1.03Nb0.1Al0.1Col.0Cu0.1Ga0.1Fe65.57 (mass percentage content) to smelt NdFeB alloy cast pieces, and use hydrogen crushing and jet milling to make powder Process, prepare raw material powder with an average particle size of 3.2 microns for use.

[0028] b. Feed the material into the charging hopper to make a blank of 40*40*25 (orientation size) square size. When the mold cavity is filled with powder with a height of 2-4mm, spray a layer of fine alumina powder with an average particle size of 2.5 microns. After the reciprocating loading is completed, the orientation and compression molding are performed in a magnetic field with a magnetic field strength of 2.0T to obtain a compact.

[0029] c. After isostatic pressing, the compact is placed in a vacuum sintering furnace, sintered at 1030℃×4hr and then air-cooled, and then tempered at 900℃×3hr and 520℃×5hr to obtain sintering magnet. The measured average magnetic performance indexes...

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Abstract

The invention discloses a high-resistivity rare earth iron series R-Fe-B magnet. The high-resistivity rare earth iron series R-Fe-B magnet is of a sandwich structure which is formed by alternately pressing a plurality of magnetic powder layers of rare earth iron series and a plurality of micro powder layers of oxide or fluoride. The outermost layer of the sandwich structure is the corresponding magnetic power layer. The invention further discloses a manufacturing method of the high-resistivity rare earth iron series R-Fe-B magnet. According to the method, the high-resistivity high-performance magnet can be obtained under the condition that residual magnetism, coercive force and other magnetic properties are not changed basically. When the magnet is applied to a rotor of a motor, especially a medium-high-power high-speed rotation motor, eddy loss in the rotation motor can be greatly reduced, and the efficiency of the motor can be improved. Under the premise that excellent magnetic properties can be kept, the magnet with a high-resistivity thin layer or insulation thin layer separated and the manufacturing and forming method are provided, the high-resistivity magnet is obtained, and therefore the eddy loss and magnetic property reduction caused by heating of the magnet are reduced.

Description

technical field [0001] The invention relates to the field of rare earth permanent magnet material manufacture, in particular to a high-resistivity rare earth iron-based R-Fe-B magnet and a preparation method thereof. Background technique [0002] In recent years, with the miniaturization and high performance of various motors, coupled with the emphasis on energy conservation and environmental protection, the usage of high-performance R-Fe-B sintered magnets has increased rapidly. The application range of R-Fe-B sintered magnets has been extended to fields such as electric vehicles and wind power generators. However, R-Fe-B based sintered magnets are metal magnets with low electrical resistance. When used in rotating electrical machines, there is a problem of large eddy current loss, which reduces the efficiency of the electrical machine. Therefore, it is required to increase the resistivity of the R-Fe-B system sintered magnet. [0003] The current research and production ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02B22F3/16
Inventor 王永东彭磊向春涛陈静武黄秀莲衣晓飞熊永飞
Owner EARTH PANDA ADVANCE MAGNETIC MATERIAL
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