Radiation-orientated sintered magnetic ring processing method

A technology of radiation orientation and processing method, which is applied in the field of magnetic materials, can solve the problems of few researches and the reduction of comprehensive magnetic properties of radiation orientation magnetic rings, and achieve the effects of uniform penetration, controllable penetration, and wide application range of raw materials

Active Publication Date: 2018-11-30
SHENZHEN RADIMAG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the methods for producing magnetic rings with internal 2:14:1 main phase grains whose easy magnetization directions are arranged according to the radiation direction include the opposed magnetic field method and the rotating magnetic field method. In the process of producing the radiation-oriented magnetic rings, the alloy From smelting, powder making, magnetic field forming, vacuum sintering and heat treatment to mechanical processing, each production process will cause more or less defects inside the microstructure of the magnetic ring, and these defects will reduce the comprehensive magnetic properties of the radiation orientation magnetic ring
[0004] It has been confirmed by many researches and invention patents that the internal structure of parallel oriented sintered magnetic rings can be repaired by infiltrating certain elements, but there are few studies on the magnetic properties of magnetic rings where the directions of easy magnetization are arranged in the direction of radiation. The processing technology related to improving the magnetic properties of radiation-oriented sintered magnetic rings while improving the thermal stability and corrosion resistance of the magnetic rings, and enhancing the radiation orientation of the magnetic rings has not yet appeared, which is exactly the problem faced by the industry

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0045] The preparation method of the radiation orientation sintered magnetic ring includes: radiation orientation and forming steps, and a sintering step, wherein the radiation orientation and forming steps include: (1) filling the mold cavity with magnetic powder to be formed, an inner magnetic pole is arranged inside the mold cavity, and the mold cavity An outer magnetic pole is arranged outside; (2) the outer magnetic pole rotates relative to the mold cavity, or the mold cavity rotates relative to the outer magnetic pole, and an orientation magnetic field is generated between the inner and outer magnetic poles, and there is a relative rotation between the orientation magnetic field and the magnetic powder, and the magnetic powder is Magnetization and radiation orientation; (3) While rotating, apply gradually increasing pressure to press and shape the magnetic powder to obtain a radiation-oriented blank, which is vacuum sintered at 1000-1100°C to obtain a radiation-oriented ma...

Embodiment 1

[0050] The composition and ratio (percentage by weight) of the oriented sintered magnetic ring in this embodiment: rare earth PrNd content 29-31%, Dy content 1-2.5%, Co content 0.8-1.2%, B content 0.95-1.1%, Nb content 0.10 -0.35%, Cu content ≤0.20%, Al content 0.10-0.3%, the balance is Fe and unavoidable impurities;

[0051] Including the following preparation steps:

[0052] A. Prepare the magnetic powder to be molded according to the above composition and ratio, radiate orientation molding, and then sinter, wherein the radiation orientation and molding steps include: (1) Fill the mold cavity with the magnetic powder to be molded, set an inner magnetic pole inside the mold cavity, and Set an outer magnetic pole; (2) The outer magnetic pole rotates relative to the mold cavity, or the mold cavity rotates relative to the outer magnetic pole, an orientation magnetic field is generated between the inner and outer magnetic poles, and there is a relative rotation between the orient...

Embodiment 2

[0062] The composition and ratio (percentage by weight) of the oriented sintered magnetic ring in this embodiment: rare earth PrNd content 30-32%, Dy+Tb content 1.5-4.0%, Ni content 0.20-2.0%, B content 0.95-1.1%, Nb ﹢Zr content≤1.0%, Cu content 0.02-0.25%, Al≤0.50%, the balance is Fe and unavoidable impurities;

[0063] Including the following preparation steps:

[0064] A. Prepare the magnetic powder to be molded according to the above composition and ratio, radiate orientation molding, and then sinter, wherein the radiation orientation and molding steps include: (1) Fill the mold cavity with the magnetic powder to be molded, set an inner magnetic pole inside the mold cavity, and Set an outer magnetic pole; (2) The outer magnetic pole rotates relative to the mold cavity, or the mold cavity rotates relative to the outer magnetic pole, an orientation magnetic field is generated between the inner and outer magnetic poles, and there is a relative rotation between the orientation...

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Abstract

The invention discloses a radiation-orientated sintered magnetic ring processing method. In a penetration process, except for atomic diffusion motion of a target permeation source relative to a magnetic ring, the target permeation source and the magnetic ring have macroscopic relative motion rather than relative fixation in macroscopic position, wherein the macroscopic relative motion does not include ball milling motion and refers to rotating or stirring motion between the magnetic ring and the target permeation source. The magnetic ring is obtained by radiation orientated forming through a rotating magnetic field. By adoption of the method, magnetic performances of the radiation-orientated sintered magnetic ring are improved, coercivity is remarkably improved under the condition that evident reduction of remanence is avoided, magnetic flux thermal decay is remarkably reduced, and excellent magnetic performances and thermal stability are achieved.

Description

technical field [0001] The invention belongs to the field of magnetic materials, and in particular relates to a processing method for radiation-oriented sintered magnetic rings. technical background [0002] The magnetic ring with the inner 2:14:1 main phase grains whose easy magnetization directions are arranged in the radiation direction (that is, the radiation orientation magnetic ring) is consistent with the inner 2:14:1 main phase grains in terms of production process and magnetic characteristics. The magnetic rings whose magnetization directions are arranged in parallel directions are significantly different. For example, for the inner 2:14:1 main phase grains, the magnetic ring whose easy magnetization directions are arranged in the radial direction can theoretically be magnetized into any multipole along the radial direction, but the magnetic ring whose easy magnetization directions are arranged in parallel directions along the radial direction The direction can onl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02
CPCH01F41/0253H01F41/0293
Inventor 成问好魏方允王严成走程
Owner SHENZHEN RADIMAG TECH CO LTD
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