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Nano biphase isotropic composite permanent magnet and preparation method thereof

An isotropic, permanent magnet technology, used in the manufacture of magnetic objects, permanent magnets, inductors/transformers/magnets, etc., can solve problems such as difficult application and increased cost, and achieve high remanence, improved magnet performance, and high magnetic energy product. Effect

Active Publication Date: 2014-04-16
CHENGDU GALAXY MAGNETAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the magnetic properties of hot-pressed NdFeB magnets obtained by the previous technology, especially the maximum magnetic energy product and remanence, have no distance from bonded NdFeB products, and the cost has increased a lot, making it difficult to obtain practical applications for this solution.

Method used

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  • Nano biphase isotropic composite permanent magnet and preparation method thereof
  • Nano biphase isotropic composite permanent magnet and preparation method thereof
  • Nano biphase isotropic composite permanent magnet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Change the composition to Nd 1.7 PR 7.7 Dy 0.1 Fe 80.9 B 5.1 co 4.2 Ga 0.1 Nb 0.2 Nano dual-phase quenching alloy powder is pressed into Φ at 25°C and 400MPa pressure 外 45mm×Φ 内 39mm×50mm high ring blank;

[0028] (2) Coat the surface of the ring blank with boron nitride / absolute ethanol mixed lubricant and dry;

[0029] (3) Place the ring blank at 750°C, 7×10 -2 Under the condition of Pa vacuum, the pressure of 300MPa is used to press, and the size is Φ 外 46mm×Φ 内 38mm x 32mm high full-density isotropic composite permanent magnet;

[0030] (4) After the surface of the pressed ring blank is ground, the sample is cut out by a wire electric discharge machine for testing.

[0031] Magnetic test results with a hysteresis loop: Br=9.54kGs, bHc=7.2kOe, iHc=8.2kOe, (BH) max =17.6MGOe, the recoil permeability is 1.2, and finally the 6-pole magnetization is carried out, and the magnetic flux intensity on the surface of the magnetic poles is measured as 2.9kGs b...

Embodiment 2

[0033] (1) Divide the composition into Nd 6.5 PR 4.35 Tb 0.15 Fe 78.5 B 5.2 co 5 Ga 0.17 Al 0.01 Nb 0.12Nano dual-phase quenching alloy powder is pressed into Φ at 20°C under a pressure of 500MPa 外 45mm×Φ 内 39mm×50mm high ring blank;

[0034] (2) Coat the surface of the ring blank with boron nitride / acetone mixed lubricant and dry;

[0035] (3) Place the ring blank at 800°C, 6×10 -2 Under the condition of MPa vacuum, the pressure of 400MPa is used to press, and the size is Φ 外 46mm×Φ 内 38mm x 32mm high full-density isotropic composite permanent magnet;

[0036] (4) After the surface of the pressed ring blank is ground, the sample is cut out by a wire electric discharge machine for testing.

[0037] Magnetic test results measured with a hysteresis loop: Br=9.77kGs, bHc=7.5kOe, iHc=11.72kOe, (BH) max =19.47MGOe, the recoil permeability is 1.15, and finally the 6-pole magnetization is carried out, and the magnetic flux intensity on the surface of the magnetic pole ...

Embodiment 3

[0039] (1) Divide the composition into Nd 3.2 PR 6.7 Dy 0.1 Fe 80.1 B 5.1 co 4.5 Ga 0.12 Al 0.01 Nb 0.17 The nano-dual-phase quenching alloy powder is pressed into Φ at 25°C and a pressure of 500MPa 外 45mm×Φ 内 39mm×50mm high ring blank;

[0040] (2) Apply molybdenum disulfide / acetone mixed lubricant on the surface of the ring blank and dry;

[0041] (3) Place the ring blank at 750°C, 6×10 -2 Under the condition of MPa vacuum, the pressure of 300MPa is pressed, and the relative density is 100%, and the size is Φ 外 46mm×Φ 内 38mm×32mm high isotropic composite permanent magnet;

[0042] (4) After the surface of the pressed ring blank is ground, the sample is cut out by a wire electric discharge machine for testing.

[0043] Magnetic test results with a hysteresis loop: Br=9.82kGs, bHc=7.2kOe, iHc=9.08kOe, (BH) max =18.66MGOe, the recoil permeability is 1.2, and finally the 8-pole magnetization is carried out, and the magnetic flux intensity on the surface of the mag...

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PUM

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Abstract

The invention discloses a rare earth permanent magnet and a preparation method thereof. According to a nano biphase isotropic composite permanent magnet provided by the invention, a general formula of nano biphase rapid quenching alloy powder components based on an atom ratio is RxFe100-x-y-xByMz, wherein x ranges from 6.0 to 11.7, y ranges from 5.0 to 6.0, z ranges from 4.0 to 10.0, R is selected from one or more of Pr, Nd, Tb and Dy, and M is selected from one or more of Co, Ga, Al and Nb. The nano biphase isotropic composite permanent magnet prepared by adopting a vacuum hot pressing method has the characteristics of full density of isotropy, and can be magnetized into a multipole ring with poles of any even number according to the application requirement.

Description

technical field [0001] The invention relates to a rare earth permanent magnet and a preparation method thereof, in particular to a nanometer two-phase isotropic composite permanent magnet and a preparation method thereof. Background technique [0002] Rare earth permanent magnet materials are intermetallic compounds composed of rare earth metal elements and transition group metal elements. NdFeB permanent magnets are part of rare earth permanent magnet materials and belong to the third generation of rare earth permanent magnets. They are products with the best performance and price ratio so far. Magnets. NdFeB permanent magnets mainly include bonded NdFeB magnets, sintered NdFeB magnets and hot-pressed NdFeB magnets. Bonded NdFeB magnets have relatively low magnetic properties and are mainly used in micro and small precision motors; sintered NdFeB magnets and hot-pressed NdFeB magnets have relatively high magnetic properties and are mainly used for high magnetic performance...

Claims

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Application Information

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IPC IPC(8): H01F7/02H01F1/147H01F1/047H01F41/02B22F3/02
Inventor 何金洲张宇
Owner CHENGDU GALAXY MAGNETAB
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