High-performance yttrium-cerium-based rare earth permanent magnet and preparation method thereof

Abstract

The invention discloses a high-performance yttrium-cerium-based rare earth permanent magnet and a preparation method thereof. The permanent magnet comprises a grain boundary phase and a main phase ofa multi-shell layer structure. A component of a final magnet of the permanent magnet is, in atomic percentage,Re1aRe2bYcCedMeBfFe100-a-b-c-d-e-f, Re1 is any one of Pr, Nd and PrNd, and Re2 is any oneor more than two elements of Dy, Tb, Ho and Gd; M is any one or more than two elements of Cu, Co, Al, Nb, Ga, Zr, Ni and Ti; the following conditions are satisfied: 4.5< / =a< / = 13.5, 0.1< / =b < / =5, 0.3< / =c< / =8.7, 0.3< / =d< / =8.7, 12.5< / =a+b+c+d< / =20, 1.25< / =c+d< / =9, 0<e< / =10, 5.4< / =f< / =7;and the balance Fe and other inevitable impurities are included. In the invention, high-abundance rare earth yttrium and cerium are applied, intrinsic magnetism of the magnet can be improved, a coercive force and corrosion resistance can be increased by designing a multi-shell structure of the magnet and optimizing a grain boundary phase, a grain boundary epitaxial layer and main phase component distribution, and a high-value application of high-abundance rare earth is promoted while cost is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of preparation of rare earth permanent magnet materials, in particular to a high-performance yttrium cerium-based rare earth permanent magnet and a preparation method thereof. Background technique [0002] Rare-earth permanent magnets are indispensable materials in the fields of national security, information, energy, and environmental protection. China is the largest producer of rare-earth permanent magnet materials, especially the third-generation rare-earth permanent magnet-NdFeB. The comprehensive magnetic properties have become the key materials for the development of modern industrial technology. The data shows that in 2018, the output of sintered NdFeB blanks in my country was 155,000 tons, accounting for more than 85% of the world's total output, and at the same time continued to grow at an annual growth rate of about 5%. The extensive use of NdFeB has led to a sharp increase in the application of r...

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Problems solved by technology

[0004] However, the technical scheme of preparing rare earth permanent magnets by sharing Y and Ce in the prior art has not been reported so far.

Mainly due to two reasons: First, the melting points of Re-Fe-B alloys with different rare earth elements have certain differences, and Y and Ce share magnets. Compared with magnets prepared solely with Y or Ce, the casting process is more complicated and waste is easily formed; The second is that the Y and Ce shared magnets prepared by the traditional process have not improved their phase formation and microstructure, and their performance and raw material cost have not been significantly improved compared with the magnets prepared by simply using Y or Ce. Therefore, the Y and Ce shared magnets less research

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