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Anisotropic rare-earth permanent magnet material and its magnetic powder and magnet mfg. method

An anisotropic and rare earth permanent magnet technology, which is applied in the fields of magnetic materials, inorganic material magnetism, inductor/transformer/magnet manufacturing, etc., can solve the problems of not having calendering anisotropy and not being able to prepare anisotropic calendering magnets, etc.

Active Publication Date: 2007-03-28
NINGXIA MAGVALLEY NOVEL MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this magnetic powder is isotropic, that is to say, it sacrifices magnetic properties for stability, and can only be used to manufacture isotropic molded magnets.
[0006] In short, so far, the rare earth-iron-nitrogen magnetic powders revealed by different methods and adding different elements are either isotropic or anisotropic only under a magnetic field, but none of them have calendering anisotropy, and Anisotropic rolled magnets cannot be prepared
In order to meet the requirements of device miniaturization, it is necessary to develop various types of high-performance anisotropic rare earth bonded magnets, especially anisotropic flexible calendered rubber magnets. The stability of the magnetic powder, but there is no rare earth permanent magnet material that can meet this requirement

Method used

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  • Anisotropic rare-earth permanent magnet material and its magnetic powder and magnet mfg. method
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  • Anisotropic rare-earth permanent magnet material and its magnetic powder and magnet mfg. method

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Experimental program
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Effect test

Embodiment 1

[0071] The composition of Sm, Pr, Fe, Si in the following list 1, the master alloy is prepared by quick-setting sheet technology, and then heat-treated in a nitrogen atmosphere, the treatment temperature is 450°-600°C (because the composition changes, the nitrogen absorption temperature should be adjusted appropriately , to ensure the best gas-solid phase reaction conditions under the corresponding components), and finally use a ball mill to powder, and the average particle size of the magnetic powder is 1.5 μm. The magnetic powder was stored in the atmosphere at room temperature (July 1st to November 1st), and Sm 2 Fe 17 N x The residual magnetic induction intensity of the type magnetic powder does not change much, but the coercive force is significantly attenuated, so the maximum magnetic energy product also changes. It can be seen from the comparison that the Sm-Pr-Fe-Si-N magnetic powder has excellent performance and stability.

[0072] Table 1.Sm 2 Fe 17 N x The res...

Embodiment 2

[0076] Carry out according to the step of embodiment 1 fully, with composition (Sm 1-α PR α ) 9.0 Fe bal Si 1.0 N 14.0 . Prepare magnetic powder, change the value of α, the dependence of permanent magnetic properties and α is shown in Table 2.

[0077] Table 2. Magnetic powder (Sm 1-α PR α ) 9.0 Fe bal Si 1.0 N 14.0 The change of permanent magnetic properties with α (stabilized performance)

[0078] α

Embodiment 3

[0080] Carry out according to the method and step of embodiment 1 fully, but with composition (Sm 0.9 PR 0.1 ) 9.0 Fe bal Si y N 14.0 Prepare magnetic powder, change the value of y, the dependence of permanent magnetic properties and y is shown in Table 3.

[0081] Table 3. (Sm 0.9 PR 0.1 ) 9.0 Fe balSi y N 14.0 Variation of magnetic powder properties with Si content y

[0082] y

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Abstract

Possessing Th2Zn17 type crystal structure, the disclosed material of anisotropic rare earth permanent magnet with its components can be expressed as (Sm1-alphaRalpha)xFe100-x-y-zMyIz, where R as Pr or combination between Pr or other rare earth elements, 0.01<= alpha <=0.30, M selected from Si, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Nb, Mo, Al, and Zr, I as N only or combination between N and C, 7<=x<=12,0.01<=y<=8.0,6<=z<=14.4. Using the specific technique produces magnetic powder of single crystal grain in sheet form with average grain size as 1-3 micro. The magnetic powder possesses anisotropy of magnetocrystalline under action of external magnetic field as well as rolling anisotropy and stress anisotropy. Based on three kinds of anisotropy, the invention discloses method for preparing high performance flexible rubber magnet with rolling anisotropy.

Description

technical field [0001] The invention relates to an anisotropic rare earth permanent magnet material and a method for manufacturing the anisotropic magnetic powder and the anisotropic rolled flexible magnet. Background technique [0002] There are two types of rare earth magnets: sintered magnets and bonded magnets. In recent years, bonded magnets have developed rapidly, and bonded magnets are divided into different types such as molded magnets, injection magnets, extruded magnets and calendered magnets due to different molding techniques. Flexible rubber magnets manufactured by calendering technology are easy to process, low in cost, and have huge application demands. Among the existing permanent magnet materials, only ferrite magnetic powder has rolling anisotropy, which has been used to manufacture flexible rolling magnets in large quantities. However, although ferrite has rolling anisotropy, because it is ferrimagnetic, its magnetic properties are low, and the maximum e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/053H01F1/08H01F41/02
CPCH01F1/083H01F1/0596B22F2999/00H01F41/0273C22C33/0257C22C2202/02B22F3/18B22F1/10B22F2202/05
Inventor 杨应昌
Owner NINGXIA MAGVALLEY NOVEL MATERIALS TECH CO LTD
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