Journal Article10.1016/J.ACTAMAT.2018.06.037
Microstructure of a Dy-free Nd-Fe-B sintered magnet with 2 T coercivity
Xiandong Xu,Takayoshi Sasaki,Jiangnan Li,Z.J. Dong,Hossein Sepehri-Amin,T.-H. Kim,Tadakatsu Ohkubo,Thomas Schrefl,Kazuhiro Hono +8 more
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TL;DR: In this article, the microstructure of the Dy-free high coercivity sintered magnet that was developed by optimizing the chemical composition of Nd-Fe-B sintering magnet with 0.% Ga doping was investigated.
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About: This article is published in Acta Materialia. The article was published on 01 Sep 2018. The article focuses on the topics: Coercivity & Magnet.
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Citations
Attaining high magnetic performance in as-sintered multi-main-phase Nd-La-Ce-Fe-B magnets: Toward skipping the post-sinter annealing treatment
TL;DR: In this paper, two-step post-sinterference annealing (PSA) treatment has been used for enhancing the coercivity of Nd-Fe-B sintered magnet.
82
Grain boundary oxide layers in NdFeB-based permanent magnets
Andrey Mazilkin,Boris B. Straumal,Boris B. Straumal,Svetlana G. Protasova,S. Gorji,S. Gorji,A. B. Straumal,M. Katter,Gisela Schütz,B. Barezky +9 more
TL;DR: In this paper, the microstructure of grain boundaries (GBs) in the commercial NdFeB-based alloy for permanent magnets has been studied, and it is shown that the GB oxide layers can be used for further development of Nd FeBbased permanent magnets.
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Grain boundary engineering towards high-figure-of-merit Nd-Ce-Fe-B sintered magnets: Synergetic effects of (Nd, Pr)Hx and Cu co-dopants
Jiaying Jin,Mi Yan,W. Chen,Wenying Zhang,Zhiheng Zhang,Lizhong Zhao,Guohua Bai,Jean-Marc Greneche +7 more
TL;DR: In this article, the trade-offs between coercivity, remanence and corrosion resistance of Nd-Ce-Fe-B sintered magnets were investigated, and a (Nd, Pr)Hx and Cu grain boundary engineering pathway was proposed to tackle the tradeoff between coercivities and remanents.
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Balancing the microstructure and chemical heterogeneity of multi-main-phase Nd-Ce-La-Fe-B sintered magnets by tailoring the liquid-phase-sintering
TL;DR: In this article, the authors report a versatile strategy to balance the chemical heterogeneity and microstructure of MMP Nd-Ce-La-Fe-B magnets through tailoring liquid-phase sintering.
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PrAl and PrDyAl diffusion into Nd-La-Ce-Fe-B sintered magnets: Critical role of surface microstructure in the magnetic performance
TL;DR: To solve the challenging hurdle of low coercivity, Pr80Al20 and Pr40Dy40Al20 diffusion is applied to the Nd-La-Ce-Fe-B sintered magnets with high LaCe substitution as discussed by the authors.
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References
Magnetic materials and devices for the 21st century: Stronger, lighter, and more energy efficient
TL;DR: Considering future bottlenecks in raw materials, options for the recycling of rare-earth intermetallics for hard magnets will be discussed and their potential impact on energy efficiency is discussed.
Magnetization and magnetic anisotropy of R2Fe14B measured on single crystals
Satoshi Hirosawa,Yutaka Matsuura,Hitoshi Yamamoto,Setsuo Fujimura,Masato Sagawa,Hiroshi Yamauchi +5 more
TL;DR: In this article, the temperature dependence of the saturation magnetization and the magnetocrystalline anisotropy field have been measured on single-crystal samples of the R2Fe14B compounds for R=Y, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, and Tm.
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Permanent magnet materials based on the rare earth-iron-boron tetragonal compounds
TL;DR: In this paper, structural and metallographic studies were carried out on the Nd-Fe-B alloy system as well as the nd-fe-B tetragonal compound on which record high energy magnets have been developed using a powder metallurgical technique.
792
Permanent magnets: Plugging the gap
TL;DR: The market split roughly 2:1 between Nd-Fe-B and hard ferrite, whose costs are currently in a ratio of more than 25:1 as discussed by the authors, and the escalation of rare earth costs presents an opportunity for new magnets with an energy product of 100-200kJ/m −3, intermediate between ferrite ( −3 ) and Nd−Fe −B (> 200kJ /m−3 ), provided the costs of raw materials and manufacturing are kept low.
650
Strategy for high-coercivity Nd-Fe-B magnets
TL;DR: The formation of continuous thin layers of a Ndrich amorphous phase surrounding Nd 2 Fe 14 B grains is the key microstructural feature of high-coercivity Nd-Fe 14 B magnets.
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