Improved energy product in grained aligned and sintered MRE2Fe14B magnets (MRE=Y plus Dy plus Nd)

TitleImproved energy product in grained aligned and sintered MRE2Fe14B magnets (MRE=Y plus Dy plus Nd)
Publication TypeJournal Article
Year of Publication2010
AuthorsTang W, Wu YQ, Oster NT, Dennis KW, Kramer MJ, Anderson IE, McCallum RW
Journal TitleJournal of Applied Physics
Volume107
Pages09a728
Date Published05/01
ISBN Number0021-8979
Accession NumberISI:000277834300087
Keywordsr2fe14b
Abstract

Sintered [Nd-0.45(Y3Dy1)(0.25)*(0.55)](2.8)Fe14B magnets were prepared for the first time. Magnetic properties and microstructures of the magnets were investigated by magnetic measurements and electron microprobe analysis. The microstructure consists of a MRE2Fe14B (2-14-1) phase matrix having a grain size of similar to 10 mu m and a RE-rich grain boundary phase. However, sintering resulted in segregation of Y to the inner and Nd to the outside of the 2-14-1 grains. The magnet has a room temperature (BH)(max) of 25.4 MGOe, which is two times higher than that of the isotropic melt spun ribbons with similar compositions. The temperature coefficients of Br (alpha) and Hcj (beta) for the magnet are -0.150 and -0.632%/degrees C from 27 to 127 degrees C, respectively. These temperature coefficients, especially for beta, are also much higher than those of melt spun ribbons. The composition segregation in the 2-14-1 grains is believed to be responsible for the higher temperature coefficients. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3347786]

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