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Oxygen adsorption of molten Ag-Cu eutectic alloyand its associated surface modification

Kang, Youngjo and Brillo, Jürgen and Han, Jihye and Kim, Han-Gyol and Giuranno, Donatella and Novakovic, Rada and Ricci, Enrica and Arato, Elisabetta and Lee, Joonho (2020) Oxygen adsorption of molten Ag-Cu eutectic alloyand its associated surface modification. Journal of Molecular Liquids, 319, pp. 114294-1. Elsevier. doi: 10.1016/j.molliq.2020.114294. ISSN 0167-7322.

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The surface tension of liquid Ag-Cu eutectic alloy has been measured in a wide range of oxygen partial pressures using two different methods: the constrained drop method and the electromagnetic levitation method. In order to investigate the influence of oxygen potential on the surface tension of the Ag-40Cu (at %) eutectic alloy, the oxygen partial pressure was varied between 8.62×10-15 and 2.42 Pa. At low oxygen partial pressure, the surface tension of the Ag-Cu eutectic alloy measured in the temperature range of 1223-1476 K, shows a temperature dependence in a good agreement with previously reported results. At higher oxygen partial pressures, the decrease in surface tension is more pronounced and the oxygen adsorption on the surface accordingly increases. Moreover, at high oxygen partial pressure, the oxygen adsorption on the Ag-Cu eutectic alloy was found to be far greater than the expected saturation limit taking into account the theoretically calculated surface concentration of Cu in the Ag-Cu eutectic alloy and the surface excess of oxygen on the molten Cu at saturation. This phenomenon can be explained with a model where the surface of the Ag-Cu eutectic alloy undergoes Cu-substitution at the Ag sites during the oxygen adsorption process.

Item URL in elib:https://elib.dlr.de/136160/
Document Type:Article
Title:Oxygen adsorption of molten Ag-Cu eutectic alloyand its associated surface modification
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Kang, YoungjoDong-A University, Dep. of Mat. Sci. Eng, Busan, KoreaUNSPECIFIED
Brillo, JürgenJuergen.Brillo (at) dlr.deUNSPECIFIED
Han, JihyeKorea University, Dep. Mat. Sci. Eng, Seoul, KoreaUNSPECIFIED
Kim, Han-GyolKorea University, Dep, Mat. Sci. Eng, Seoul, KoreaUNSPECIFIED
Giuranno, DonatellaCNR-IENI Genova, ItalienUNSPECIFIED
Novakovic, RadaCNR-IENI, Genova, ItalienUNSPECIFIED
Ricci, EnricaCNR-IENI, Genova, ItalienUNSPECIFIED
Arato, ElisabettaCNR-IENI, Genova, ItalienUNSPECIFIED
Lee, JoonhoKorea University, Dep Mat. Sci Eng, Seoul, KoreaUNSPECIFIED
Journal or Publication Title:Journal of Molecular Liquids
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.molliq.2020.114294
Page Range:pp. 114294-1
Keywords:Ag-Cu eutectic alloy; Surface tension; Constrained drop method; Electromagnetic levitation method; Oxygen adsorption.
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Research under Space Conditions
DLR - Research theme (Project):R - Materials Research and Microgravity (MuM)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space > Scientific Experiments MP
Deposited By: Brillo, Dr.rer.nat. Jürgen
Deposited On:21 Sep 2020 09:12
Last Modified:22 Feb 2021 08:47

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