Application of Hydrogen in the Production of Sintered Anisotropic Nanostructured Magnets from Alloys of Rare-Earth and Transition Metals

The main stages of the procedure of hydrogen treatment of ferromagnetic materials based on Nd 2 Fe 14 B, SmCo 5 , and Sm 2 Co 17 compounds of rare-earth and transition metals aimed at manufacturing of nanostructured anisotropic sintered magnets are discussed. It is shown that, by using combined hydr...

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Bibliographic Details
Published in:Materials science (New York, N.Y.) N.Y.), 2019-05, Vol.54 (6), p.761-775
Main Author: Bulyk, І. І.
Format: Article
Language:English
Subjects:
Alloys
Anisotropy
Characterization and Evaluation of Materials
Chemistry and Materials Science
Ferromagnetism
Hydrogen
Hydrogenation
Materials Science
Metals (Materials)
Production management
Sintering
Solid Mechanics
Structural Materials
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Summary:The main stages of the procedure of hydrogen treatment of ferromagnetic materials based on Nd 2 Fe 14 B, SmCo 5 , and Sm 2 Co 17 compounds of rare-earth and transition metals aimed at manufacturing of nanostructured anisotropic sintered magnets are discussed. It is shown that, by using combined hydrogen treatment based on the modified hydrogenation–disproportionation–desorption–recombination (HDDR) method, we refine the microstructure of ferromagnetic alloys down to the nanolevel. We experimentally establish the mechanism of getting magnetically anisotropic materials by the HDDR method: the materials are anisotropic if they contain residues of the initial phase after disproportionation. We prove the possibility of application of hydrogen treatment by the HDDR method for the purposes of sintering of ferromagnetic nanostructured materials.
ISSN:1068-820X
1573-885X
DOI:10.1007/s11003-019-00262-7