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

Valery Kaplan, Tatyana Bendikov, Yishay Feldman, Konstantin Gartsman, Ellen Wachtel, Igor Lubomirsky

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

An electrochemical cell containing molten Li2CO3-Li2O at 900 °C has been proposed for the conversion of the greenhouse gas CO2 to CO for chemical energy storage. In the current work, we have examined the corrosion resistance of zirconia, beryllia and magnesia ceramics at 900 °C in the Li2CO3-Li2O and Li-Na-K carbonate eutectic mixtures to identify 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 h 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 h is explained by the formation of a lithium zirconate coating on the ceramic. 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
Pages (from-to)271-276
Number of pages6
JournalJournal of Power Sources
Volume301
DOIs
Publication statusPublished - Jan 1 2016

Fingerprint

Magnesium Oxide
Beryllia
Alkali Metals
Carbonates
Magnesia
Alkali metals
zirconium oxides
Zirconia
eutectics
alkali metals
Molten materials
carbonates
corrosion
lithium
ceramics
Eutectics
Corrosion
insulation
Lithium
Insulating materials

Keywords

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

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Physical and Theoretical Chemistry

Cite this

Corrosion testing of zirconia, beryllia and magnesia ceramics in molten alkali metal carbonates at 900 °c. / Kaplan, Valery; Bendikov, Tatyana; Feldman, Yishay; Gartsman, Konstantin; Wachtel, Ellen; Lubomirsky, Igor.

In: Journal of Power Sources, Vol. 301, 01.01.2016, p. 271-276.

Research output: Contribution to journalArticle

Kaplan, Valery ; Bendikov, Tatyana ; Feldman, Yishay ; Gartsman, Konstantin ; Wachtel, Ellen ; Lubomirsky, Igor. / Corrosion testing of zirconia, beryllia and magnesia ceramics in molten alkali metal carbonates at 900 °c. In: Journal of Power Sources. 2016 ; Vol. 301. pp. 271-276.
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