A processing technology for improving the intrinsic coercive force of rare earth permanent magnets

Abstract

The invention relates to a processing technology for raising rare earth permanent magnet intrinsic coercive force, and the processing technology mainly comprises the steps of mixing a rare earth permanent magnet product black sheet I at least comprising <5% heavy rare earth and a rare earth permanent magnet product black sheet II comprising >=5% heavy rare earth by intersecting; then sintering and tempering. <{EN2}>According to the processing technology, no extra heavy rare earth like dysprosium will be added; the characteristics of the magnet that the heavy rare earth elements in the magnet can be easily precipitated, diffused and volatilized at a high temperature and after multi-time tempering are used; the intrinsic conercive force of the rare earth permanent magnet is raised; the remanent magnetism of the magnet won't be reduced and no heavy rare earth is wasted; at the same time, the deformation rate and the aged performance of the product are greatly raised.

Description

technical field [0001] The invention relates to a processing technology for improving the magnetic performance of a rare earth permanent magnet, in particular to a processing technology for improving the intrinsic coercive force of a rare earth permanent magnet. Background technique [0002] A large amount of heavy rare earths such as dysprosium is needed to increase the intrinsic coercive force of rare earth permanent magnets, and the addition of heavy rare earths seriously affects the phenomenon of magnet remanence. At present, there are two techniques for improving the intrinsic coercive force of rare earth magnets. The first is a common process, which is achieved by adding a large amount of heavy rare earth elements such as dysprosium to the formula, but heavy rare earths have a greater impact on the remanence of magnets. reduced side effects. The second is through the Dysprosium infiltration process. Heavy rare earth powders such as Dysprosium Oxide and Dysprosium Fluo...

AI Technical Summary

Problems solved by technology

[0002] The intrinsic coercive force of rare earth permanent magnets requires a large amount of heavy rare earths such as dysprosium, and the addition of heavy rare earths seriously affects the phenomenon of magnet remanence

At present, there are two techniques for improving the intrinsic coercive force of rare earth magnets. The first is a common process, which is achieved by adding a large amount of heavy rare earth elements such as dysprosium to the formula, but heavy rare earths have a greater impact on the remanence of magnets. reduced side effects

The second is through the Dysprosium infiltration process. Heavy rare earth powders such as Dysprosium Oxide and Dysprosium Fluoride are added to the heating system or applied to the product, and the Heavy Rare Earths such as Dysprosium are gradually penetrated into the surface of the magnet through high temperature, thereby improving the magnet’s performance. Intrinsic coercivity, but the process has high heating temperature (900-1000°C), long time, easy deformation of the product, easy oxidation of the surface, and low utilization rate of heavy rare earth powders such as dysprosium oxide and dysprosium fluoride (only <10%) and other shortcomings

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