The paper reports the development of a coating approach that simultaneously achieves the advantages of conductive (Mn,Co)3O4 spinel coatings and of RE-surface treatment on alloys for SOFC interconnect applications,. This approach involves the modification of (Mn,Co)3O4 spinel coatings through addition of a rare earth to the spinel composition. In particular, Ce-modified spinel coatings (Ce0.05Mn1.475Co1.475O4) behaved similarly to unmodified Mn1.5Co1.5O4 spinel coatings by acting as a Cr-outward and O-inward diffusion barrier, thus improving the surface stability and electrical performance of ferritic stainless steel. In addition, the rare earth addition appeared to alter the scale growth beneath the coating, so that alloy samples with the Ce-modified spinel coating exhibited a stronger scale/metal interface compared to samples with the unmodified spinel coating. As a result, it is anticipated that, compared to unmodified spinel coatings, the rare earth modified coatings may lead to improved structural stability and electrical performance for ferritic stainless steel-based SOFC interconnects.
Revised: September 3, 2008 |
Published: June 1, 2008
Citation
Yang Z., G. Xia, Z. Nie, J.D. Templeton, and J.W. Stevenson. 2008.Ce-Modified (Mn,Co)3O4 Spinel Coatings on Ferritic Stainless Steels for SOFC Interconnect Applications.Electrochemical and Solid-State Letters 11, no. 8:B140-B143.PNNL-SA-59723.