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R-Fe-B series magnet of gradient resistance and production method thereof

A production method, r-fe-b technology, applied in the direction of magnets, magnetic objects, chemical instruments and methods, etc., can solve the problems of difficulty in applying high-power rotating electrical machines, the magnetic performance of magnets is degraded, etc., to reduce eddy current loss and improve. Efficiency, effect of high magnetic performance

Active Publication Date: 2010-10-13
YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned various magnets, while increasing the resistance of the magnets, also caused a significant decline in the magnetic properties of the magnets, which are difficult to apply to high-power rotating electrical machines

Method used

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  • R-Fe-B series magnet of gradient resistance and production method thereof
  • R-Fe-B series magnet of gradient resistance and production method thereof
  • R-Fe-B series magnet of gradient resistance and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Raw materials with a purity greater than 99wt% are divided into components (weight percent) (Nd 21 PR 5 Dy 4.5 )Co 2 Cu 0.15 al 0.1 Nb 0.2 B 1 Fe 余量 Prepared, smelted in the vacuum strip billet continuous casting furnace, sent the scales into the hydrogen crushing furnace for hydrogen crushing to obtain hydrogen crushed particles; sent the hydrogen crushed particles into the The jet mill is finely pulverized to obtain a powder A with an average particle size d=3.3 μm, and a part of the powder A is added with 3% Dy with an average particle size d=3.2 μm 2 o 3Powder, mix uniformly to obtain powder B; send powder A and B into the magnetic orientation molding device in an environment with an oxygen content of less than 1%, use a spacer to carry out layered filling along the direction of magnetization, the volume ratio of powder A and powder B It is 3.6:1, and orientation molding is carried out after powder filling; the molded body is sent to a sintering furnace in ...

Embodiment 2

[0034] Raw materials with a purity greater than 99wt% are divided into components (weight percent) (Nd 21 PR 5 Dy 4.5 )Co 2 Cu 0.15 Al 0.1 Nb 0.2 B 1 Fe 余量 Prepared and smelted in a vacuum strip billet continuous casting furnace, the scales are sent to the hydrogen crushing furnace for hydrogen crushing to obtain hydrogen crushed particles; a part of the hydrogen crushed particles are sent to Enter the jet mill for fine pulverization to obtain a powder A with an average particle size d=3.3 μm, and send another part of the crushed particles after hydrogen pulverization into the jet mill for fine pulverization in an environment with an oxygen content of 1.5% to obtain an average particle size d =3.4μm powder B, powders A and B are sent into the magnetic orientation forming device in an environment with an oxygen content of less than 1%, and the spacer plate is used to carry out layered filling along the direction of magnetization, and the volume ratio of powder A to powde...

Embodiment 3

[0036] Raw materials with a purity greater than 99wt% are divided into components (weight percent) (Nd 21 PR 5 Dy 4.5 )Co 2 Cu 0.15 Al 0.1 Nb 0.2 B 1 Fe 余量 , prepared, smelted in a vacuum strip billet continuous casting furnace, sent the scales to the hydrogen crushing furnace for hydrogen crushing to obtain hydrogen crushed particles; the hydrogen crushed particles were sent to Finely pulverize by airflow milling to obtain powder A with an average particle size d=3.3 μm, and add 1% of Al with an average particle size d=1.5 μm to a part of the powder A 2 o 3 Powder, mix uniformly to obtain powder B; send powder A and B into the magnetic orientation molding device in an environment with an oxygen content of less than 1%, use a spacer to carry out layered filling along the direction of magnetization, the volume ratio of powder A and powder B It is 3.6:1, and the powder is filled and then magnetized and formed; the molded body is sent to the sintering furnace in an envir...

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Abstract

The invention discloses an R-Fe-B series magnet of gradient resistance and a production method thereof, relates to a permanent magnetic material with a high-resistance surface layer and a high-magnetism main body layer and a production method thereof, and aims to provides the R-Fe-B series magnet of gradient resistance capable of simultaneously keeping high resistance and superior magnetic performance and the production method thereof. The R-Fe-B series magnet of gradient resistance comprises the surface layer G and the main body layer H, wherein the surface layer G is connected with the mainbody layer H through a sintered layer I; the oxygen content of the surface layer G is greater than that of the main body layer H; and the resistivity of the surface layer G is no less than that of the main body layer H.

Description

technical field [0001] The invention relates to a rare earth permanent magnet material, in particular to an R-Fe-B system magnet with gradient resistance and a production method thereof. Background technique [0002] In the past technology, the permanent magnet rotating electrical machines mainly used low-cost ferrite magnets. Usage is increasing year by year. Especially recently, with the concern of energy conservation and environmental protection around the world, the application range of R-Fe-B sintered magnets has been extended to cover household appliances, industrial equipment, electric vehicles and wind power generators and other fields. However, R-Fe-B 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. [0003] In order to improve the resistance of R-Fe-B sintered magnets, JP-9-232122 discloses a high-resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057B22F9/04B22F3/16
CPCC22C38/14H01F41/0266C22C38/002H01F1/0577B32B15/011H01F7/02C22C38/10C22C38/12C22C38/005C22C28/00C22C38/06B32B15/01H01F1/0572C22C38/16H01F7/021
Inventor 彭步庄赵军涛李广军
Owner YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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