Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

Effect of processing hydrogen pressure on magnetic properties of HDDR Nd-Fe-B magnet

Journal Article · · IEEE Transactions on Magnetics
 [1];  [2];  [3];  [4];  [2];  [1]
  1. Ames Lab., Ames, IA (United States). Critical Materials Inst. (CMI)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Ames Lab., Ames, IA (United States)
  4. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
+ Show Author Affiliations

High coercivity and anisotropic Nd-Fe-B powders for making anisotropic bonded magnets have been prepared by hydrogenation-disproportionation-desorption-recombination (HDDR). In this work, we found that the processing hydrogen pressure is intimately correlated with the formation of c-axis crystal texture of Nd2Fe14B phase. There exists a critical hydrogen pressure, Pcrit, during hydrogen-disproportionation stage, that promotes the formation of c-axis crystal texture. When processing hydrogen pressure is higher than Pcrit, the formation of c-axis texture deteriorates and results in isotropic Nd-Fe-B magnetic powders. The existence of Pcrit is ascribed to the thermodynamics and kinetics origin during HDDR process.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Ames Laboratory (AMES), Ames, IA (United States). Critical Materials Institute (CMI)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office
Grant/Contract Number:
AC05-00OR22725; AC02-07CH11358
OSTI ID:
1665952
Alternate ID(s):
OSTI ID: 1764845
Journal Information:
IEEE Transactions on Magnetics, Journal Name: IEEE Transactions on Magnetics Journal Issue: 2 Vol. 57; ISSN 0018-9464
Publisher:
Institute of Electrical and Electronics Engineers. Magnetics GroupCopyright Statement
Country of Publication:
United States
Language:
English

Similar Records

New aspects of Nd{endash}Fe{endash}B-based hydrogenation-disproportionation-desorption-recombination powders and anisotropic bonded magnets made from them: Microstructure and magnetic properties (invited)
Journal Article · Mon Mar 31 23:00:00 EST 1997 · Journal of Applied Physics · OSTI ID:496524
Development of HDDR process and anisotropic Nd-Fe-B bonded magnets
Journal Article · Fri Oct 01 00:00:00 EDT 1993 · IEEE Translation Journal on Magnetics in Japan (Institute of Electrical and Electronics Engineers); (United States) · OSTI ID:5610346

Related Subjects

36 MATERIALS SCIENCE
Nd2Fe14B
anisotropic powder
bonded magnets
hydrogenation-disproportionation-desorption-recombination (HDDR)
rare earth