JAXA Repository / AIREX 未来へ続く、宙(そら)への英知
Other TitleCalibration of Zirconia Oxygen Pump and Sensor using oxidation-reduction reaction of metals
Author(jpn)小澤, 俊平
Author(eng)Ozawa, Shumpei
Author Affiliation(jpn)千葉工業大学
Author Affiliation(eng)Chiba Institute of Technology
Issue Date2015-01-01
Chiba Institute of Technology
Publication title千葉工業大学研究報告
Report of Chiba Insitute of Technology
Start page15
End page18
Publication date2015-01-01
AbstractIn order to suppress an oxidation of materials during various high temperature processes such as casting, annealing, and sintering, reducing gas atmosphere of H2 and CO is often employed. However, these gases cannot always be used in practical industrial manufacturing because they are dangerous substance. The utilization of zirconia oxygen pump based on the Nernst principle is one of the most promising methods to reduce the oxygen partial pressure of atmospheric gas safely. Oxygen can migrate through the YSZ wall as ions when applying the voltage between the high temperature walls in this facility. Conversely, it can be used as oxygen sensor when the electromotive force between the walls is measured. However the oxygen partial pressure of the processed gas is expected to show temperature dependence due to the dissociation equilibrium of H2O because the oxygen pump cannot remove hydrogen. A small amount of hydrogen and moisture usually exist even in a high purity gas as impurities. In this study, the temperature dependence of Po2 of gas processed by the oxygen pump was experimentally confirmed by the oxidation-reduction of metals such as nickel and iron. The temperature dependence of Po2 corresponded well to that evaluated by standard Gibbs energy for the formation of H2O.
Description形態: カラー図版あり
Physical characteristics: Original contains color illustrations
Keywordsoxgen pertial pressure; zirconia oxgen pump; oxidation-reduction reaction; oxgen sensor
Document TypeDepartmental Bulletin Paper
NASA Subject CategoryMechanical Engineering

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