Production method of radiation-orienting magnet ring

A technology of radiation orientation and manufacturing method, which is applied in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc., can solve the problems of difficulty in mass-producing radiation-oriented magnetic rings with high magnetic performance, difficult to prepare, etc., and achieve high yield , The effect of high working temperature and high magnetic performance

Inactive Publication Date: 2008-05-07
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Even with some measures, it is difficult to mass-produce radiation-oriented magnetic rings with high magnetic properties
More than 40 years have passed, and it is still

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Alloy Nd 13.0 Fe 81.4 Ga 0.3 B 5.3 Prepare nanocrystalline anisotropic magnetic powder first, the particle size of magnetic powder is 1-20μm, put the magnetic powder into the mold, and magnetize the radiation orientation under the magnetic field strength of 15×79.6kA / m, and the pressure is 2-3t / cm 2 , prepare a radiation-oriented magnetic ring with an outer diameter of 30mm, an inner diameter of 20mm, and a height of 10mm; then adopt plasma sintering, heat to the sintering temperature at a rate of 60°C / min, the sintering temperature is 650°C, the sintering time is 3.0min, and the sintering pressure is 50MPa After sintering, the cooling rate to 400°C is 100°C / min.

[0024] The residual magnetic induction of the magnetic ring is 1.3T, the intrinsic coercive force is 660kA / m, and the magnetic energy product is 301kJ / m 3 .

[0025] The yield rate of the magnetic ring is high, and the magnetic ring is not easy to crack.

Embodiment 2

[0027] Sm 8.7 co 62.4 Fe 26.4 Cu 2.5 The alloy is first prepared into nanocrystalline anisotropic magnetic powder, the particle size of which is 3-10 μm, the magnetic powder is loaded into a mold, and magnetized by radiation orientation at a magnetic field strength of 15×79.6kA / m, with a pressure of 2-3t / cm 2 , prepare a radiation-oriented magnetic ring with an outer diameter of 25mm, an inner diameter of 15mm, and a height of 8mm; then adopt direct current sintering, the heating rate to the sintering temperature is 70°C / min, the sintering temperature is 750°C, the sintering time is 3.0min, and the sintering pressure is 50MPa After sintering, the cooling rate to 400°C is 120°C / min.

[0028] The residual magnetic induction of the magnetic ring is 1.0T, the coercive force is 700kA / m, and the magnetic energy product is 160kJ / m 3 .

[0029] The yield rate of the magnetic ring is high, and the magnetic ring is not easy to crack.

Embodiment 3

[0031] Powder the double alloy separately, the double alloy is Nd 13.5 Fe 78.5 co 2.4 Ga 0.3 B 5.3 , Sm 8.7 co 62.4 Fe 26.4 Cu 2.5 Composition, both are made of anisotropic nanocrystalline magnetic powder, and then the two are mixed, where Nd 13.5 Fe 78.5 co 2.4 Ga 0.3 B 5.3 Accounted for 85%, the rest is Sm 8.7 co 62.4 Fe 26.4 Cu 2.5 .

[0032] The anisotropic nanocrystalline magnetic powder is magnetized by radiation orientation under the magnetic field strength of 15×79.6kA / m, and the pressure is 2~3t / cm 2 , prepare a radiation-oriented magnetic ring with an outer diameter of 30mm, an inner diameter of 20mm, and a height of 10mm; then adopt plasma sintering, the heating rate to the sintering temperature is 60°C / min, the sintering temperature is 780°C, the sintering time is 3.0min, and the sintering pressure is 50MPa After sintering, the cooling rate to 400°C is 100°C / min.

[0033] The yield rate of the magnetic ring is high, and the magnetic ring is not ea...

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Abstract

The invention relates to a manufacturing method for a radiation-oriented magnetic ring, belonging to the technical field of the rare earth permanent magnet material. Aiming at the disadvantage that the radiation-oriented magnetic ring prepared by the prior art is easy to be broken up, the invention radiates, orients and molds anisotropic nanocrystal magnetic particles with powder particle size of 1 to 100 micron under a magnetic field, the anisotropic nanocrystal magnetic particles are pressurized and sintered with discharge plasmas or a direct current, the temperature is 500 to 960 DEG C, the time is 0.5 to 10.0 minutes, the pressure is 30 to 200 MPa, after the sintering, the temperature is rapidly reduced; magnetic powder is single alloy or double alloy (at least one kind of magnetic powder is anisotropic nanocrystal), the alloy is chosen from R1T5, R1T7, R2T17 R2T14M1, AlNiCo, FeCrCo, permanent magnetic ferrite and soft magnetic alloy with high saturation magnetization. The manufacturing method of the radiation-oriented magnetic ring is also suitable to prepare micron crystal R1T5, R2T17, R2T14M1, AlNiCo, FeCrCo radiation-oriented magnetic rings, the powder particle size is 1 to 20 micron, the magnetic ring is at least required to be thermally treated for one time. The finished product rate of the magnetic ring is higher.

Description

technical field [0001] The invention discloses a method for manufacturing a radiation-oriented magnetic ring, which belongs to the field of rare earth permanent magnet materials and motors. Background technique [0002] At present, whether it is automobiles, home appliances, information industry, or other high-tech industries, there is a large demand for rare earth permanent magnetic rings with high magnetic performance and radiation orientation, but the existing technology cannot meet this requirement. This is because the permanent magnet phase itself in the rare earth permanent magnet material is a hard and brittle phase; the radiation orientation makes the hard and brittle main phase oriented in the direction of radiation, and the permanent magnet phase is along the The shrinkage rate in different directions shows a significant difference, which leads to cracking of the magnetic ring. Such as powder sintered NdFeB (R 2 T 14 m 1 type alloy) radiation-oriented magnetic ...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/053H01F1/08B22F3/14
Inventor 潘晶刘新才
Owner NINGBO UNIV
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