High‐performance sintered R2Fe14BNx(R=Nd/Pr/Dy) magnets
作者:
T. S. Chin,
H. J. Bai,
K. D. Lin,
F. D. King,
S. J. Heh,
期刊:
Journal of Applied Physics
(AIP Available online 1991)
卷期:
Volume 70,
issue 10
页码: 6600-6602
ISSN:0021-8979
年代: 1991
DOI:10.1063/1.349870
出版商: AIP
数据来源: AIP
摘要:
High‐performance R2Fe14BNx‐type magnets (R=Nd and/or Pr/Dy) were successfully prepared by sintering. The optimum magnetic properties are coercivityiHc: 680–1440 kA/m;Hc: 500–1000 kA/m;Br: 1.0–1.3 T; and (BH)m: 180–250 kJ/m3depending on the composition and processing parameters, especially the proper sintering conditions, including nitrogen intake at 1040 to 1050 °C. The magnets thus obtained haveTcvalues of 335 to 370 °C depending on the nitrogen content, which should be <6 at. % for thermal stability. The anisotropy field increases from 6.2 to 8 T with addition of nitrogen, and magnetization measured at 2 T increases by 18%. The weight loss after immersion in a 5% HCl solution for 30 min is 25% less for nitrogenated magnets than for those without nitrogen, due to the replacement of the Nd‐rich phase at grain boundaries by more corrosion‐ resistant nitrides.
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