Abstract
Planar Solid Oxide Fuel Cells (SOFCs) are composed of repeating cathode-electrolyte-anode units separated by electrically conductive interconnects. With the reduction in fuel cell operating temperature to approximately 800°C, it has become possible to use chromium-based, ferritic stainless steel or Crofer for interconnects. These interconnects must survive the high temperature oxidizing and reducing environments while maintaining electrical conductivity. Unfortunately the formation of chromium oxide scale poisons the cell by significantly reducing cathodic activity. Chromium scale formation can be inhibited by applying an electrically conductive manganese cobalt oxide (MCO) spinel coating to the interconnect prior to its installation in the fuel cell. The most costeffective way to apply protective coatings to interconnects involves spray coating. To investigate the quality of the coatings and the coating adhesion, four-point bend experiments were undertaken at room temperature. Tensile cracking patterns on the convex surfaces of the bend specimens were used to determine the interfacial shear strengths of the coatings. SEM images of the cracked coating surfaces were processed to analyze the interface failure mechanisms, the crack spacing, and areas that spalled at higher strains. These investigations were able to show distinct differences between coatings formed with different processes parameters.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Haile S.M., Fuel cell materials and components,Acta Materialia, vol. 51, pp. 5981–6000, 2003
Sun X, Liu W.N., Stephen E. and Khaleel M.A., Determination of interfacial adhesion strength between oxide scale and substrate for metallic SOFC interconnects, Journal of Power Sources, vol. 176, pp. 167 174, 2008
Wincewicz K.C.and Cooper J.S., Taxonomies of SOFC material and manufacturing alternatives, Journal of Power Sources, vol. 140, pp. 280–296, 2005.
Puranen A. and Lagerbom J., The structure and properties of plasma sprayed Iron oxide doped Manganese Cobalt Spinel Coatings for SOFC Interconnects. Journal of Thermal Spray and Technology, 2010
Schutze M., Protective Oxide Scale and Their Breakdown, The Institute of Corrosion wiley series on corrosion and protection.
Philling N.B. and Bedworth R.E., The Oxidation of Metals at High Temperetures, J. Inst. Met, vol. 29, pp. 529–591, 1923.
Borie B., Sparks C.J. and Cathcart J.V., Epitaxially induced strains in Cu2O films on copper single crystals--I X-ray diffraction effects, Acta Materialia, vol. 10, pp. 691, 1962.
Appleby W.K., Tylecote R.F., Stresses During Gaseous Oxidation of Metal, Corros. Sci., vol. 10, pp. 325, 1970.
Jaenicke W., Leistikow W. and Stadler A., Mechanical Stresses during the Oxidation of Copper and Their Influence on Oxidation Kinetics. III, J. of Elctrochem. Soc., vol. 111, pp. 1031, 1964.
Christl W., Rahmel A. and Schutze M., Application of Acoustic Emission Techinque for the detection of oxide scale cracking during thermal cycling, J. of Elctrochem. Soc., vol. 141, pp. 1255–1260, 1994.
[11]Zhang Y., Leistikow W. and Shores D. A., Cracking and Spalling of Oxide Scale from 304 Stainless Steel at High Temperatures, J. of Elctrochem. Soc., vol. 141, pp. 1255–1260, 1994.
[12]Zhang Y. and Shores D.A., Study of Cracking and Spalling of Cr2O3 Scale Formed on Ni-30Cr Alloy, Oxidation of Metals. vol. 40, pp. 529–553, 1993.
Nagl M.M., Saunders S.R.J., Evans W.T. and Hatt D.J., The Tensile Failure of Nickel Oxide Scales at Ambient and At Growth Temperatures, Corrosion Science. vol. 35, pp. 965–977, 1993.
Sun X. Liu W.N. Stephen E. and Khaleel M.A., Determination of interfacial adhesion strength between oxide scale and substrate for metallic SOFC interconnects, Journal of Power Sources, Vol 176, pp.167-174,2007
Nagl M.M.,Saunders S.R.J, Evans W.T. and Hatt D.J., An in situ Investigation of the tensile failure of oxide scales. Oxidation of Metals. vol. 42, pp. 431–449, 1994.
Evans H.E. and Lobbs R.C., Experimental Data on the Spallation of Protective Oxide, Corros. Sci, vol. 24, pp. 209–222, 1984.
Ambhorn S.C. Toscan F. Wouter Y. Galarie A. and Dupeux A., Determination of mechanical adhesion energy of thermal oxide scales on AISI 430 Ti alloy using tensile test. Material Science and Technology,Vol. 23, Issue 4,pp. 497–501, 2007
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2011 Springer Science+Businees Media, LLC
About this paper
Cite this paper
Akanda, S., Walter, M.E. (2011). Investigation of Manganese Cobalt Oxide (MCO) Coatings on Fuel Cell Interconnects. In: Proulx, T. (eds) Experimental and Applied Mechanics, Volume 6. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-0222-0_16
Download citation
DOI: https://doi.org/10.1007/978-1-4614-0222-0_16
Published:
Publisher Name: Springer, New York, NY
Print ISBN: 978-1-4614-0221-3
Online ISBN: 978-1-4614-0222-0
eBook Packages: EngineeringEngineering (R0)