Corroded microstructure of HDDR-NdFeB magnetic powders

L. Y. Zhu, M. Itakura, Y. Tomokiyo, N. Kuwano, K. Machida

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The microstructure of corroded HDDR-NdFeB magnetic powders in bonded magnet has been investigated by transmission electron microscopy. Following an exposure time of 300h at 398K in air, the HDDR-NdFeB magnetic powders are found covered with an altered layer about 300nm thick on the surface. The layer is composed of α-Fe grains 5-10nm in diameter and h-Nd2O 3 grains smaller than 5nm. Under the altered layer, corrosion has proceeded along the Nd2(Fe,Co)14B grain boundaries to leave a wetting layer composed of a dense mixture of α-Fe and h-Nd 2O3 phase. The appearance of α-Fe grains in both of the altered layer wetting layer leads to the high magnetic flux loss of the corroded HDDR-NdFeB bonded magnet.

Original languageEnglish
Pages (from-to)353-358
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
Volume279
Issue number2-3
DOIs
Publication statusPublished - Aug 1 2004

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Powders
Magnets
Wetting
microstructure
Microstructure
Magnetic flux
Grain boundaries
Corrosion
Transmission electron microscopy
wetting
magnets
Air
magnetic flux
corrosion
grain boundaries
transmission electron microscopy
air

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Corroded microstructure of HDDR-NdFeB magnetic powders. / Zhu, L. Y.; Itakura, M.; Tomokiyo, Y.; Kuwano, N.; Machida, K.

In: Journal of Magnetism and Magnetic Materials, Vol. 279, No. 2-3, 01.08.2004, p. 353-358.

Research output: Contribution to journalArticle

Zhu, L. Y. ; Itakura, M. ; Tomokiyo, Y. ; Kuwano, N. ; Machida, K. / Corroded microstructure of HDDR-NdFeB magnetic powders. In: Journal of Magnetism and Magnetic Materials. 2004 ; Vol. 279, No. 2-3. pp. 353-358.
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