Magnetic properties and thermal stability of anisotropic bonded Nd-Fe-B magnets by warm compaction

Siwu Tao, Xin Lu, Jianjun Tian, Xuanhui Qu, Y. Honkura, H. Mitarai, K. Noguchi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Anisotropic bonded magnets were prepared by warm compaction using anisotropic Nd-Fe-B powder. The forming process, magnetic properties, and temperature stability were studied. The results indicate that the optimal temperature of the process, which was decided by the viscosity of the binders, was 110°C. With increasing pressure, the density of the magnets increased. When the pressure was above 700 MPa, the powder particles were destroyed and the magnetic properties decreased. The magnetic properties of the anisotropic bonded magnets were as follows: remanence B r = 0.98 T, intrinsic coercivity i H c=1361 kA/m, and maximum energy product BH max = 166 kJ/m3. The magnets had excellent thermal stability because of the high coercivity and good squareness of demagnetization curves. The flux density of the magnets was 35% higher than that of isotropic bonded Nd-Fe-B magnets at 120°C for 1000 h. The flux density of the bonded magnets showed little change with regard to temperature.

Original languageEnglish
Pages (from-to)245-247
Number of pages3
JournalRare Metals
Issue number3
Publication statusPublished - 2009 Jun
Externally publishedYes


  • Anisotropic magnets
  • Magnetic properties
  • Nd-Fe-B magnets
  • Thermal stability
  • Warm compaction process

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry


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