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Oxygen partial pressure control for microgravity experiments

Schulz, Michael and Brillo, Jürgen and Stenzel, Christian and Fritze, Holger (2012) Oxygen partial pressure control for microgravity experiments. Solid State Ionics, 225, pp. 332-336. DOI: 10.1016/j.ssi.2012.04.008.

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A system consisting of a high-temperature yttrium-stabilized zirconia (YSZ) based oxygen ion pump and potentiometric sensor enables precise measurement and control of oxygen partial pressure, pO2, at elevated temperatures within 0.2 to 10^-20 bar. <the principle of operation as well as the influence of temperature and gas buffers like H2/H2O on the pO2 is discussed. The ion pump is controlled by a microcontroller system and adjusts the oxygen partial pressure with an uncertainty of Delta-log(pO2)<0.02 and response times between 5 and 90s over the entire pO2 range. The oxygen ion pump is tested in combination with the electromagnetic levitation. Here, the surface tension of molten Ni at 1720 °C as a function of oxygen partial pressure is determined. A good agreement of this measurement with calculated value confirms the applicability of the system for high-temperature measurement and control of pO2. The developed hardware is suitable for the electromagnetic levitation facility onboard the international space station (ISS).

Document Type:Article
Title:Oxygen partial pressure control for microgravity experiments
AuthorsInstitution or Email of Authors
Schulz, MichaelTUC
Brillo, JürgenDLR
Stenzel, ChristianAstrium
Fritze, HolgerTUC
Journal or Publication Title:Solid State Ionics
Refereed publication:Yes
In Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 332-336
Keywords:Oxygen pump Yttrium-stabilized zirconia Electromagnetic levitation
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W FR - Forschung unter Weltraumbedingungen (old)
DLR - Research area:Space
DLR - Program:W FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):W - Vorhaben Materialforschung unter Mikro-g (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Dr.rer.nat. Jürgen Brillo
Deposited On:18 Oct 2012 08:24
Last Modified:12 Dec 2013 21:48

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