Manufacturing method for high-performance NdFeB rare earth permanent magnet devices

Abstract

The invention discloses a manufacturing method for high-performance NdFeB rare earth permanent magnet devices. The high-performance NdFeB rare earth permanent magnet devices are made of R-Fe-Co-B-M rapid-hardening alloy, microcrystal HR-Fe alloy fibers and TmGn compound micro-powder. The manufacturing method comprises the steps of manufacturing the R-Fe-Co-B-M rapid-hardening alloy, manufacturing the microcrystal HR-Fe alloy fibers, performing hydrogen decrepitation on the alloy, performing mixing before pulverization, performing pulverization in a grinding mode through air flow, performing mixing after pulverization, forming a magnetic field, performing sintering and performing aging. In this way, a sintered NdFeB permanent magnet is manufactured, and machining and surface treatment are performed on the sintered NdFeB permanent magnet to manufacture various rare earth permanent magnet devices.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnets, in particular to a method for manufacturing high-performance NdFeB rare earth permanent magnet devices. Background technique [0002] NdFeB rare earth permanent magnet materials, with their excellent magnetic properties, have been used more and more, and are widely used in medical nuclear magnetic resonance imaging, computer hard drives, audio, mobile phones, etc.; with the requirements of energy saving and low-carbon economy , NdFeB rare earth permanent magnet materials have begun to be used in auto parts, household appliances, energy saving and control motors, hybrid vehicles, wind power generation and other fields. [0003] In 1983, Japanese patents 1,622,492 and 2,137,496 first disclosed the NdFeB rare earth permanent magnet material invented by Sumitomo Metal, announced the characteristics, composition and manufacturing method of the NdFeB rare earth permanent magnet material, and...

AI Technical Summary

Problems solved by technology

[0004] With the wide application of NdFeB rare earth permanent magnets, rare earths are becoming more and more scarce, especially heavy rare earth elements are obviously becoming scarce, and the price of rare earths has risen again and again; for this reason, people have carried out many explorations, and double alloys have appeared. technology, metal infiltration technology, improvement or recombination of grain boundary phase technology, etc.; patent CN101521069B is a technology disclosed by Yue Ming, Beijing University of Technology, etc., who doped heavy rare earth hydride nanoparticles to prepare NdFeB. , followed by hydrogen crushing and jet milling, and then mixing the heavy rare earth hydride nanoparticles produced by physical vapor deposition technology with the aforementioned powder, and then manufacturing NdFeB magnets through conventional processes such as magnetic field molding and sintering, although the patent A method to improve the coercive force of magnets has been found, but the process research is not deep enough, and there are problems in mass production. Patents CN101,383,210B; CN101,364,465B; CN101,325,109B; CN101,325,109B disclose similar technologies, performance The improvement is limited, nano oxides are easy to absorb moisture, the absorbed moisture seriously affects product performance, and the product consistency is poor

Images