Corroded microstructure of HDDR-NdFeB magnetic powders

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

研究成果: Contribution to journalArticle査読

2 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)353-358
ページ数6
ジャーナルJournal of Magnetism and Magnetic Materials
279
2-3
DOI
出版ステータス出版済み - 8 2004

All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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