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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.46  No.6 (2005)  >  pp.1436-1439

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Characteristics and Sintering Behavior of Oxide Coated Iron Nanopowder Synthesized by Plasma Arc Discharge Process

Ji-Hun Yu1), Cheol-Su Youn1), Byoung-Kee Kim1), Jai-Sung Lee2) and Chul-Jin Choi1)
1) Department of Materials Technology, Korea Institute of Machinery and Materials
2) Department of Materials Science, Hanyang University

This paper investigates the effect of the surface oxide layer of Fe nanopowder synthesized by plasma arc discharge (PAD) process on the densification process in hydrogen atmosphere. The densification process was divided into two steps: rapid densification at low temperature and densification retarding at high temperature. The reduction process of the oxide layer was quantitatively analyzed, and it was observed that the reduction process dominantly affected the initial densification process at lower temperature. The volume shrinkage due to the reduction of the oxide layer corresponded to 75% of the initial volume shrinkage at low sintering temperature. The volume shrinkage of the reduced oxide layer and the densification rate were discussed in terms of microstructural evolution.

plasma arc discharge, iron nanopowder, surface oxidation, sintering, densification

Received: October 27, 2004
Accepted: May 11, 2005 , Published online: October 18, 2005
Copyright (c) 2005 The Japan Institute of Metals



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