Corrosion testing of zirconia, beryllia and magnesia ceramics in molten alkali metal carbonates at 900°C

Valery Kaplan, Igor Lubomirsky

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

An electrochemical cell containing molten Li2CO3-Li2O has been proposed for the conversion of the greenhouse gas CO2 to CO, which can then either be used to power gas turbines or converted to methanol. Since efficient electrolysis takes place at 900°C, the materials which can be used in such a cell must satisfy stringent requirements. In the current work, we have examined the static corrosion resistance of zirconia, beryllia and magnesia ceramics at 900 °C in the Li2CO3-Li2O mixture and in a Li-Na-K carbonate eutectic mixture with the ultimate objective of identifying suitable electrically insulating materials. Conclusions regarding material stability were based on elemental analysis of the melt, primarily via X-ray photoelectron spectroscopy, a particularly sensitive technique. It was found that magnesia is completely stable for at least 33 hrs in a Li2CO3-Li2O melt, while a combined lithium titanate/lithium zirconate layer forms on the zirconia ceramic as detected by XRD. Under the same melt conditions, beryllia shows considerable leaching into solution. In a Li-Na-K carbonate eutectic mixture containing 10.2 mol% oxide at 900°C under standard atmospheric conditions, magnesia showed no signs of degradation. Stabilization of the zirconia content of the eutectic mixture at 0.01-0.02 at% after 2 hrs is again explained by the formation of a lithium titanate/ lithium zirconate coating. On the basis of these results, we conclude that only magnesia can be satisfactorily used as an insulating material in electrolysis cells containing Li2CO3-Li2O melts.

Original languageEnglish
Title of host publicationAdvances in Molten Slags, Fluxes, and Salts
Subtitle of host publicationProceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016
PublisherSpringer International Publishing AG
Pages1161-1168
Number of pages8
ISBN (Print)9783319486253
Publication statusPublished - Jan 1 2016
Event10th International Conference on Molten Slags, Fluxes and Salts, MOLTEN 2016 - Seattle, United States
Duration: May 22 2016May 25 2016

Other

Other10th International Conference on Molten Slags, Fluxes and Salts, MOLTEN 2016
CountryUnited States
CitySeattle
Period5/22/165/25/16

Fingerprint

Magnesium Oxide
Beryllia
Alkali Metals
Carbonates
Magnesia
Alkali metals
Zirconia
Molten materials
Lithium
Eutectics
Corrosion
Insulating materials
Testing
Electrolysis
Electrochemical cells
Carbon Monoxide
Greenhouse gases
Oxides
Leaching
Methanol

Keywords

  • Beryllia
  • CO electrolysis
  • Magnesia
  • Molten carbonates
  • Zirconia

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Chemistry
  • Metals and Alloys

Cite this

Kaplan, V., & Lubomirsky, I. (2016). Corrosion testing of zirconia, beryllia and magnesia ceramics in molten alkali metal carbonates at 900°C. In Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016 (pp. 1161-1168). Springer International Publishing AG.

Corrosion testing of zirconia, beryllia and magnesia ceramics in molten alkali metal carbonates at 900°C. / Kaplan, Valery; Lubomirsky, Igor.

Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016. Springer International Publishing AG, 2016. p. 1161-1168.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Kaplan, V & Lubomirsky, I 2016, Corrosion testing of zirconia, beryllia and magnesia ceramics in molten alkali metal carbonates at 900°C. in Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016. Springer International Publishing AG, pp. 1161-1168, 10th International Conference on Molten Slags, Fluxes and Salts, MOLTEN 2016, Seattle, United States, 5/22/16.
Kaplan V, Lubomirsky I. Corrosion testing of zirconia, beryllia and magnesia ceramics in molten alkali metal carbonates at 900°C. In Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016. Springer International Publishing AG. 2016. p. 1161-1168
Kaplan, Valery ; Lubomirsky, Igor. / Corrosion testing of zirconia, beryllia and magnesia ceramics in molten alkali metal carbonates at 900°C. Advances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016. Springer International Publishing AG, 2016. pp. 1161-1168
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