Consolidation of hydrogenation-disproportionation-desorption-recombination processed Nd-Fe-B magnets by spark plasma sintering

K. Suresh, T. Ohkubo, Y. K. Takahashi, K. Oh-ishi, R. Gopalan, K. Hono*, T. Nishiuchi, N. Nozawa, S. Hirosawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

We have successfully consolidated hydrogenation-disproportionation-desorption-recombination (HDDR) processed Nd-Fe-Co-Zr-B-Ga powder by spark plasma sintering (SPS). The field compacted samples were sintered at different temperatures (TS) from 550 to 600 °C with compressive pressure of 80 MPa for 20 min. Microstructural investigations by transmission electron microscopy indicated that the sintered specimen exhibits Nd2Fe14B grains of ~300 nm with Nd-rich grain boundary phase. The optimum magnetic properties of Br: 1.22 T, Hc: 928 kA/m, BHc: 600 kA/m, (BH)max: 210 kJ/m3 were obtained in the sample sintered at 550 °C. The strategy for further improving the coercivity and remanence is discussed based on the microstructure-property relationships.

Original languageEnglish
Pages (from-to)3681-3686
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
Volume321
Issue number22
DOIs
Publication statusPublished - 2009 Nov
Externally publishedYes

Keywords

  • Coercivity
  • HDDR
  • Nd-Fe-B
  • Permanent magnet
  • Spark plasma sintering

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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