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High resistivity fully compacted permanent magnet material and preparation method thereof

A technology of permanent magnet materials and rare earth permanent magnets, which is applied in magnetic materials, inductance/transformer/magnet manufacturing, circuits, etc., can solve problems such as performance degradation, and achieve the effects of increasing resistivity, improving permanent magnet performance, and having a wide range of sources

Active Publication Date: 2018-07-03
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned patent documents all involve the addition of fluoride or oxyfluoride to dense magnets, but adding the disclosed components to rare earth magnets inevitably faces the problem of performance degradation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0034] Alloy powder is prepared by rapid quenching process, adding a certain amount of Ca(Ce,La,Nd) 2 [CO 3 ]F 2 Oxyfluoride powder, the magnet is hot pressed at 650-700°C, the heat deformation is at 850°C, and the heat deformation rate is 72%. The magnets obtained in Examples 1-4 are magnets 1-4, respectively.

[0035] All magnets 1 to 4 formed dense magnets. Compared with magnet 5 (without oxyfluoride) and magnet 6 (adjusted particle size) prepared by the same process, the resistivity was greatly improved. The results are shown in Table 1.

[0036] serial number

[0037] As can be seen from the above table, the greatest advantage of the present invention is that since the oxyfluoride contains a certain amount of rare earth, the powder at the grain boundary is uniform and has good compatibility with the rare earth-rich phase at the grain boundary; in addition, by adding the oxyfluoride material, the resistivity increased by more than 2 times. On the other hand, ...

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Abstract

The invention discloses a rare earth permanent magnet material which comprises alloy powder, the primary component of which is RFeMB, wherein R contains Nd or PrNd, and M is one or more of Co, Ga, Aland Cu. The rare earth permanent magnet material also comprises oxyfluoride powder, the component of which is CaRE2[CO3]F2, wherein RE is selected from one or more of Ce, La and Nd. In addition, the invention also discloses a method for preparing the rare earth permanent magnet material. Synchysite which is wide in source and lower in cost is combined with rare earth elements, so that the resistivity of the fully compacted magnet is improved obviously, and the thermal processing performance of the magnet is reduced greatly, and therefore, the eddy-current loss is reduced effectively.

Description

technical field [0001] The invention relates to a permanent magnet alloy, in particular to a high-resistivity full-dense permanent magnet material and a preparation method thereof, belonging to the field of permanent magnet materials. Background technique [0002] Under the current global economic and environmental conditions, the general concern for high efficiency and energy saving has led to the use of permanent magnet motors with simple structure, high power factor, and large starting torque to replace traditional electric excitation motors in various industrial fields. However, due to the effect of the space harmonics and time harmonics of the magnetic field, there are eddy currents in the rare earth permanent magnets; and with the increase of the motor power, the volume of the permanent magnets becomes larger, coupled with the poor heat dissipation of the rotor, the eddy current loss will not only cause higher temperature rise , reduce work efficiency, and in extreme c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0573H01F1/0576H01F41/0266
Inventor 罗阳谢佳君孙亮于敦波张洪滨李红卫杨远飞袁超
Owner GRIREM ADVANCED MATERIALS CO LTD
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