Abstract
Nd-Fe-B bonded magnet scraps were recovered as the nano-composite powders composed of α-Fe, FexB and Nd2O3 by a disproportionation method and their electromagnetic wave absorption properties at the GHz range were characterized to recycle them as efficient absorbers. The bonded magnet scraps decomposed to NdH2, FexB and α-Fe at 873 K for 30-60 min in H2, of which NdH2 was converted to the corresponding fine particles of Nd2O 3 by the subsequent oxidation at room temperature for 120 min in air. Resin-bonded discs prepared from the composites powders of α-Fe/Fe xB/Nd2O3 (mean diameter ≅ 20 nm), Fe xB (amorphous) and Nd2O3 particles showed the excellent electromagnetic wave absorption ability in a frequency range of 4.0-6.7 GHz, which shifted to the high GHz region side compared with binary composite ones of α-Fe/rare earth oxide.
| Original language | English |
|---|---|
| Pages (from-to) | 1391-1395 |
| Number of pages | 5 |
| Journal | Journal of Alloys and Compounds |
| Volume | 408-412 |
| DOIs | |
| Publication status | Published - 2006 Feb 9 |
| Externally published | Yes |
| Event | Proceedings of the Rare Earths'04 in Nara, Japan - Duration: 2004 Nov 7 → 2004 Nov 12 |
Keywords
- Electromagnetic microwave absorbers
- Magnet scraps
- Nd-Fe-B intermetallic compound
- Rare earth bonded magnets
- Recycling
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry