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Disintegration and Powder Formation of Nb75M25 (M = Al, Si, Ga, Ge, and Sn) Due to Hydrogenation in an Arc-melting Chamber

Published online by Cambridge University Press:  31 January 2011

Xingguo Li ,
Akihiko Chiba ,
Seiki Takahashi  and
Katsuhisa Ohsaki
Xingguo Li
Affiliation:
Department of Materials Science and Technology, Faculty of Engineering, Iwate University, Morioka, 020, Japan
Akihiko Chiba
Affiliation:
Department of Materials Science and Technology, Faculty of Engineering, Iwate University, Morioka, 020, Japan
Seiki Takahashi
Affiliation:
Department of Materials Science and Technology, Faculty of Engineering, Iwate University, Morioka, 020, Japan
Katsuhisa Ohsaki
Affiliation:
Steel and Technology Development Laboratory, Nisshin Steel Co., LTD., Ichikawa, 272, Japan
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Abstract

Nb75M25 (M = Al, Si, Ga, Ge, and Sn) alloy ingots were prepared by the conventional arc-melting method and then were directly reacted with high purity hydrogen of 0.1 MPa in an arc-;melting chamber without exposing the ingots to air. As the clean surface of the arc-;melted ingots is preserved, the ingots rapidly absorb a large amount of hydrogen without any activation treatments and disintegrate violently into fine particles. The disintegration of ingots depends on the M element. The collected particles are investigated by x-ray diffraction, electron microscopy, chemical analysis, and thermal analysis. The particles are hydrides of Nb75M25 after hydrogenation and have a sharp-edged polygonal appearance. After dehydriding, fine Nb3M powders with A15 crystalline structure are obtained except for Nb75Si25. In comparison with the atomized Nb3M powders, the Nb3M powders prepared by the present study have a smaller average particle size and lower impurity contents.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 9 , September 1998 , pp. 2526 - 2532
Copyright
Copyright © Materials Research Society 1998

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