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Tuesday, October 19, 2004 - 2:00 PM
FUEL 5.1

Oxidation of Ferritic Alloys for Interconnects in Solid Oxide Fuel Cells

G. H. Meier, J. Hammer, L. Scot, F. S. Petti, University of Pittsburgh, Pittsburgh, PA; N. Dhanaraj, J. L. Beuth, Carnegie Mellon University, Pittsburgh, PA

The University of Pittsburgh and Carnegie Mellon University, in collaboration with investigators at several National Laboratories, are teaming in a study directed at improving interconnect materials for solid oxide fuel cells (SOFCs). The program has three thrusts. The first is to develop mechanism-based evaluation procedures for the durability of interconnect materials and to use these procedures to study and modify a group of alloys, which have already been identified as candidate interconnect materials. The second thrust is to investigate the fundamental thermo-mechanical aspects of SOFC interconnects and coatings applied to the interconnects. This involves “Stress Measurement by X-ray Diffraction” and “Indentation Testing of Interface Adhesion” and development of “Accelerated Testing Procedures”. The third thrust is to investigate the potential for the application of “new” metallic materials as interconnect materials This presentation will describe the results obtained in the first thrust area. Several ferritic alloys have been oxidized under conditions typical of the anode and cathode sides of SOFCs i.e. in air, air+H2O, and H2/H2O at temperatures between 700 and 900˚C. The oxidation kinetics, oxidation morphologies, and electrical conductivities of the oxide scales will be described. Factors relating to metallurgical stability of the alloys and evaporation of chromium oxide scales will also be discussed

Summary: This presentation will discuss the results of exposures of ferritic alloys to simulated SOFC operating conditions. Oxidation kinetics, oxide evaporation, oxide conductivity, and metallurgical stability of the alloys will be discussed.