Internal Oxidation of a Ag-l.3 at.% Se Alloy. Part I: Composition and Appearance of Oxidation Products |
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| Authors: | J Roth L Kosec P ?kraba M Bizjak J Medved M Dobnikar I An?el |
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| Affiliation: | (1) Department of Materials and Metallurgy, Faculty of Natural Sciences and Engineering, University of Ljubljana, Slovenia;(2) Department of Geology, Faculty of Natural Sciences and Engineering, University of Ljubljana, Slovenia;(3) Faculty of Mechanical Engineering, University of Maribor, Slovenia |
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| Abstract: | The internal oxidation of a two-phase Ag-1.3 at.% Se alloy in pure oxygen was studied at 750, 800 and 830°C. The alloy is composed of a dilute solid solution of selenium in silver) and Ag2Se intermetallic particles. The internal oxidation of this alloy proceeds through gradual in-situ oxidation of the Ag2Se particles as well as through diffusive internal oxidation of selenium from solid solution. Gradual in-situ internal oxidation of Ag2Se particles reflects itself in the appearance of two internal-oxidation fronts, inner and outer, marking the beginning and end of the in-situ oxidation of Ag2Se particles. The oxide phase formed during in-situ oxidation is the molten double oxide, Ag2SeO3. A theoretical treatment of the phase relationships in a hypothetical Ag–Ag2Se–Ag2SeO3 ternary phase diagram is presented to assist the explanation of the mechanism of in-situ oxidation. The kinetics of oxidation are presented in Part II. |
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| Keywords: | silver– selenium alloy Ag2Se in-situ oxidation Ag2SeO3 internal oxidationof two-phase alloys |
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