Anisotropic bonded NdFeB magnets with radial oriented magnetization by 2-step warm compaction process

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

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Anisotropic bonded NdFeB magnets obviously have better magnetic properties than those of conventional isotropic bonded NdFeB magnets. The anisotropic bonded magnets can be used to make some magnetic devices with special oriented magnetization, such as radial oriented rings. In order to increase the magnetic properties and prolong the life of the molding die, the anisotropic bonded NdFeB magnets with radial oriented magnetization were prepared by 2-step warm compaction molding, which were called the aligning step and densifying step, respectively. In the aligning step, the magnetic powder particles aligned along the radial direction of the magnetic field (1.0 T) and are compressed under 143 MPa at 393 K. (BH)max and density of the magnets were 146 kJ/m3 and 5.7 g/cm3, respectively. Then the ring compacts were re-compressed under 800 MPa at 420 K in the densifying step. The density increased to 6.2 g/cm3 and magnetic properties were: Br = 0.92 T, Hcj = 1020 kA/m, (BH)max = 168 kJ/m3. SEM micrograph showed that the magnets had excellent microstructure and the magnetic particles were evenly coated by binder. Crown

Original languageEnglish
Pages (from-to)510-514
Number of pages5
JournalJournal of Alloys and Compounds
Volume477
Issue number1-2
DOIs
Publication statusPublished - 2009 May 27
Externally publishedYes

Keywords

  • Anisotropic bonded NdFeB magnets
  • Density
  • Magnetic properties
  • Radial oriented magnetization
  • Warm compaction

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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