Neodymium-iron-boron permanent magnet material prepared from Dy and preparation method thereof

Abstract

The invention provides a neodymium iron boron permanent magnet material prepared from Dy and a preparation method thereof, and belongs to the technical field of materials. The invention provides a neodymium-iron-boron permanent magnet material prepared by using Dy and a preparation method thereof, and Dy is diffused at a neodymium-iron-boron crystal boundary to synthesize the permanent magnet material with more excellent performance. The surface of the neodymium iron boron regenerated magnet is coated with a layer of Dy element powder, sintering is conducted in a vacuum sintering furnace, the Dy element is diffused on an Nd2Fe14B phase grain boundary to synthesize the permanent magnet material of a core-shell structure with the Nd2Fe14B phase wrapped by heavy rare earth, and the coercive force, the magnetic energy product, the Curie temperature and the like of the neodymium iron boron regenerated magnet can be remarkably improved.

Description

[0001] This application is a divisional application with an application date of January 13, 2020, an application number of 202010034117.7, and an invention title of "A NdFeB Permanent Magnet Material Prepared Using Dy and Its Preparation Method". technical field [0002] The invention relates to the field of material technology, in particular to an NdFeB permanent magnet material prepared by using Dy and a preparation method thereof. Background technique [0003] Since Park et al. discovered the excellent improvement effect of grain boundary diffusion technology on the coercive force of NdFeB, a large number of experts and scholars have been attracted to carry out research on NdFeB heavy rare earth grain boundary diffusion technology. Heavy rare earth elements Dy and Tb have a high anisotropy field. The traditional process is mainly added in the smelting process. Dy and Tb elements are evenly distributed inside the entire grain. After replacing Nd, the coercive force of the m...

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Problems solved by technology

Heavy rare earth elements Dy and Tb have a high anisotropy field. The traditional process is mainly added in the smelting process. Dy and Tb elements are evenly distributed inside the entire grain. After replacing Nd, the coercive force of the magnet is improved. However, due to Dy, Tb Elements and iron are antiferromagnetically coupled, and the partial replacement of Nd elements reduces the magnetic moment of iron atoms, resulting in a decrease in remanence

[0004] The structural composition of NdFeB scrap regenerative magnets is more complicated than that of magnets produced by smelting process. At present, there are few studies on the grain boundary diffusion of regenerative magnets.

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