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High energy gasification/atomization of Fe#-[3]B/R#-[2]Fe#-[14]B nanometer composite permanent magnet powder and its preparation method

A permanent magnetic powder and nanocomposite technology, which is applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of high cost and low magnetic performance, and achieve high B content, low rare earth content, and high market competitiveness. Effect

Inactive Publication Date: 2005-03-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the maximum magnetic energy product (BH)max of this powder is only 9MGOe, and the magnetic properties of commercial isotropic injection-molded NdFeB magnets are only 5.0-5.2MGOe, which is low.
Also, its cost is significantly higher than that of injected ferrite magnets

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Ingredient formulation according to design Nd 4 (Fe 0.8 co 0.2 ) 75 B 18.5 Zr 2.5 (at%), using metal neodymium, pure iron, boron iron, sponge zirconium, and electrolytic Co as raw materials, using high-energy gas atomization equipment, with a spray pressure of 4MPa and a supersonic argon flow with a speed of several Machs, the 1400 ° C The liquid metal is directly atomized into an amorphous spherical powder. After testing, the average particle size of the atomized powder is 28 μm. Then, the atomized powder was crystallized at 650°C for 20 minutes under an argon atmosphere of +0.01MPa. The test results of the magnetic properties are:

[0026] Remanence Br is 1.14T (11KGs);

[0027] The intrinsic coercivity Hcj is 462KA / m (5.78KOe);

[0028] Maximum energy product (BH)max: 97KJ / m 3 (12.1 MGOe).

Embodiment 2

[0030] Ingredient formulation according to design Nd 4.5 Fe 74 B 18.5 Zr 1.5 Cr 1.5 (at%), using metal neodymium, pure iron, boron iron, sponge zirconium, and metal chromium as raw materials, using high-energy gas atomization equipment, with a jet pressure of 4.3MPa, and a supersonic argon flow with a speed of several Machs to 1400 ° C The liquid metal is directly atomized into amorphous spherical powder. After testing, the average particle size of the atomized powder is 18 μm. Crystallize the atomized powder at +0.01MPa argon atmosphere at 650°C for 20min. The test results of the magnetic properties are:

[0031] Remanence Br is 1.08T (10.8KGs);

[0032] The intrinsic coercivity Hcj is 523KA / m (6.54KOe);

[0033] Maximum energy product (BH)max: 89KJ / m 3 (11.1 MGOe).

Embodiment 3

[0035] Ingredient formulation according to design Nd 5 Fe 7 4B 18 Ti 1.5 Cr1 .5 (at%), using metal neodymium, pure iron, boron iron, sponge Ti, and metal chromium as raw materials, using high-energy gas atomization equipment, with a jet pressure of 3.8MPa, and a supersonic argon flow with a speed of several Machs to 1400 ° C The liquid metal is directly atomized into amorphous spherical powder. After testing, the average particle size of the atomized powder is 27 μm. The atomized powder was crystallized at 600°C for 20 minutes under an argon atmosphere of +0.01MPa. The test results of the magnetic properties are:

[0036] Remanence Br is 0.98T (9.8KGs);

[0037] The intrinsic coercivity Hcj is 486KA / m (6.07KOe);

[0038] Maximum energy product (BH)max: 86KJ / m 3 (10.8 MGOe).

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Abstract

The invention makes public a kind of composite nanometer Fe3B / R2Fe14B permanent magnetism powder by high-energy gas atomizing and the method of making it. Transform the alloy fluid, whose atomic composition formulary is Rx(Fel-wCow)100-x-y-xByTz, into ball powder by high-energy gas atomizing. Then dispose it and get composite nanometer Fe3B / R2Fe14B powder based on Fe3B by hot crystallization. The R is at least one component as following: Nd, Pr, Dy, and Tb. The T is at least one of the following components: Zr, Nb, Cr, Ga, Ti, V and Si. And the proportion should be:3.0<=x<=6.0,8<=y<=22,0<=z<=5,0<=w<=0.5. The powder made by this method has advantages such as glaze, ball shape, good fluidity and low cost, and is especially fit for adhesive binding magnet by injection molding.

Description

technical field [0001] The invention relates to the field of magnetic materials, in particular to a high-energy gas atomization Fe 3 B / R 2 Fe 14 B nanocomposite permanent magnet powder and its preparation method. The permanent magnet powder prepared by the method has the advantages of smooth surface, spherical shape and good fluidity, and is especially suitable for injection molding bonded magnets. Background technique [0002] NdFeB rare earth permanent magnet material, as the third generation permanent magnet material, has been widely used in high-tech products such as computers, mobile phones, audio equipment, and motors due to its small size, light weight, strong magnetism, and high cost performance. NdFeB permanent magnet materials can be divided into sintered NdFeB and bonded NdFeB, both of which have their own advantages and disadvantages. Sintered NdFeB has better magnetic properties, but the production process is more complicated and the cost is correspondingly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08H01F1/057
Inventor 文玉华严密罗伟王晨
Owner ZHEJIANG UNIV
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