Studies of sintered MRE-Fe-B magnets by DyF3 addition or diffusion treatment (MRE = Nd+Y+Dy)

TitleStudies of sintered MRE-Fe-B magnets by DyF3 addition or diffusion treatment (MRE = Nd+Y+Dy)
Publication TypeJournal Article
Year of Publication2012
AuthorsTang W, Dennis KW, Kramer MJ, Anderson IE, McCallum RW
Journal TitleJournal of Applied Physics
Volume111
Pages07a736
Date Published04
Type of ArticleArticle
ISBN Number0021-8979
Accession NumberWOS:000303282400097
Abstract

Sintered MRE2(Fe, Co)(14)B magnets by DyF3 blending or diffusion treatment were investigated. "Base-line" magnets with a thickness of 1.5mm were coated (painted) with DyF3 powder and heated to promote Dy diffusion at 800-900 degrees C, i.e., "Diffusion" magnets. For comparison, the magnet alloy powder for making Base-line magnets was blended with 3-5 wt.% DyF3 powder and then made into sintered magnets, i.e., "Blended" magnets. The coercivity and (BH)(max) of Base-line magnets were 9.7 kOe and 32.7 MGOe, respectively, while the coercivity of Diffusion magnets was increased to 15 kOe and the (BH) max was nearly unchanged at 31.4MGOe. Blended magnets with 5 wt% DyF3 had a coercivity of 17.8 kOe, but the (BH)(max) was reduced to 25.4 MGOe, due to a considerable reduction of remanence. The total Dy concentration in the MRE2(Fe, Co)(14)B Diffusion magnets with a beta value of -0.5%/degrees C was 5.3wt%, while typical commercial Nd-based Nd2Fe14B magnets require at least 7.5 wt% Dy to achieve the same beta. Therefore, the MRE2(Fe, Co)(14)B Diffusion magnets exhibited better temperature stability. (C) 2012 American Institute of Physics. [doi: 10.1063/1.3679465]

URL<Go to ISI>://WOS:000303282400097
DOI10.1063/1.3679465
Alternate JournalJ. Appl. Phys.