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On the coupled growth of oxide phases during internal oxidation of Ag–Sn–Bi alloys

  • Gunther Wiehl , Bernd Kempf , Matthias Ommer and Markus Rettenmayr
Published/Copyright: May 18, 2013
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Abstract

Internal oxidation experiments using two Ag–Sn–Bi alloys with Bi contents of 2.6 wt.% and 5.0 wt.% were carried out. The presence and spatial distribution of Bi2O3, SnO2 and Bi2Sn2O7 in the oxidized microstructure was characterized using a field emission gun secondary electron microscope, energy dispersive X-ray analysis and X-ray diffraction techniques. It is shown that the addition of Bi prevents both external oxidation and internal oxide bands in Ag–Sn alloys with Sn content above 4 wt.%. Conditions are defined under which these alloys develop instabilities at the internal oxidation front. A result of the unstable growth of the reaction front is a dendritic morphology consisting of different oxide phases. Coupled growth of Bi2Sn2O7 and SnO2 inside the dendrites determines the local arrangement and distribution of the phases.


Correspondence address, Prof. Dr. Markus Rettenmayr, Friedrich-Schiller-Universität Jena, Löbdergraben 32, D-07743 Jena, Germany, Tel.: +493641 947790, Fax: +493641 947792. E-mail:

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Received: 2011-3-15
Accepted: 2011-10-18
Published Online: 2013-05-18
Published in Print: 2012-03-01

© 2012, Carl Hanser Verlag, München

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