Production method for composite anisotropic rare earth permanent magnetic material with good temperature characteristics

An anisotropic, rare earth permanent magnet technology, applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problems of complex protection mixing process, high cost, and easy oxidation

Inactive Publication Date: 2012-05-16
BEIJING BEILILONG MAGNETIC MATERIALS TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Drawing on the results of previous work, HDDR NdFeB and R 2 Fe(N, B) recombination may be an effective way to increase the maximum service temperature of the magnet, but R 2 Fe(N, B) system, here is mainly SmFeN material, the manufacturing process is relatively complicated, and because the size of this type of magnetic powder is too small, it is easy to oxidize, so its protection and mixing process with HDDRNdFeB powder are relatively complicated, so SmFeN is used Combining with HDDR NdFeB is theoretically feasible, but it may be a high-cost approach from the perspective of industrial production, which is not conducive to large-scale promotion

Method used

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  • Production method for composite anisotropic rare earth permanent magnetic material with good temperature characteristics
  • Production method for composite anisotropic rare earth permanent magnetic material with good temperature characteristics
  • Production method for composite anisotropic rare earth permanent magnetic material with good temperature characteristics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Manufacturing of samples

[0037] a. R 1 Manufacture of FeBM anisotropic coarse powder

[0038] As one of the magnetic powders used in the present invention, R 1 FeBM is obtained by HDDR process. The specific manufacturing method is to make the atomic ratio into Nd 12.5 Fe bal B 6.0 Ga 0.3 Nb 0.3 The alloy raw materials are loaded into the vacuum induction furnace, and the vacuum is lowered to less than 1×10 -2 Pa, melting and casting under the protection of argon, and homogenizing the alloy at 1403-1423K for 35 hours under the protection of argon. The homogenized alloy is crushed to particles smaller than 10mm, and put into the HDDR furnace for treatment. The treatment process is: hydrogen charging at room temperature 0.1MPa, heating to 673K, reducing hydrogen partial pressure to 0.03-0.06MPa, and increasing the temperature under this pressure to 810°C and keep it for 2 hours, then remove the hydrogen until the vacuum in the furnace reaches 1×10 -2 Pa, th...

Embodiment 2

[0053] According to the manufacturing method of Example 1, only the temperature for homogenizing the steel ingot was changed, and the results obtained are shown in Table 2.

[0054] Table 2. The effect of different homogenization treatment systems of single NdFeB material on the magnetic properties of injection magnets

[0055] (Nylon-12 content 7wt%)

[0056]

[0057] From the data of Br in Table 2, it can be seen that the choice of homogenization treatment temperature is very important. Samples No.5 and No.6 show only weak anisotropy characteristics, and the lower the temperature, the weaker the anisotropy.

Embodiment 3

[0059] According to the manufacturing method of embodiment 1, only different coating states are selected, the results are shown in Table 3,

[0060] Table 3. 79.05 wt% HDDR NdFeB coarse powder and 13.95 wt% Sm 2 (CoCuFeZr) 17 Effect of Different Coating States of Fine Powder on Magnetic Properties of Injected Magnets (7wt% Nylon-12)

[0061]

[0062]

[0063] It can be seen from Table 3 that no matter whether the two magnetic powders are coated or only the fine powder is coated, the magnetic properties of the magnets made are better than those made from the magnetic powders that are not coated. This is mainly due to the density Due to the contribution of the magnetic powder, the coating treatment of the magnetic powder also has some improvement effects on the material iHc and the maximum service temperature.

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Abstract

A method for preparing a composite anisotropic rare-earth permanent magnet material with good temperature characteristics belongs to the technical field of rare-earth permanent magnetic material. The anisotropic rare-earth permanent magnet material is formed by compounding R1FeBM coarse magnetic powder and R2CoM' fine magnetic powder, with the average particle diameter within a limited range and a coupling agent coated on the surface of the magnetic power, according to a certain ratio, wherein R1 and R2 are rare-earth type elements. Through the particle producing process with an organic binding agent at suitable temperature, the composite material leads the R2CoM' fine magnetic powder with better temperature characteristics to be uniformly coated around the R1FeBM magnetic coarse powder. The binding type magnet of injection, mold pressing, extrusion and the like, which is made from the composite powder under the function of a magnetic field not only can improve the temperature characteristics and using temperature of the R1FeBM, but also can simultaneously obtain the comprehensive magnetic property which is better than the magnet made from any one type of materials.

Description

technical field [0001] The invention belongs to the technical field of rare-earth permanent magnet materials, and in particular provides a method for manufacturing a composite anisotropic rare-earth permanent magnet material with good temperature characteristics, as well as various magnets made of the rare-earth permanent magnet powder that meet higher temperature requirements. Anisotropic bonded magnets, the molding method of magnets is injection molding, and can also be used for compression molding and extrusion molding. technical background [0002] High-performance permanent magnets are widely used in various electromechanical equipment, especially in miniaturized motors. As a newly developed anisotropic bonded rare earth permanent magnet material represented by HDDR NdFeB, its excellent magnetic properties are much higher than that of commonly used isotropic permanent magnet materials, and its application prospects are very promising. Anisotropic NdFeB magnetic powder ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F1/08B22F3/12B22F1/02
Inventor 仝成利肖耀福魏刚王洪军孙宝利
Owner BEIJING BEILILONG MAGNETIC MATERIALS TECH
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