Dense Protective Coatings for SOFC Interconnect Deposited by Spray Pyrolysis

Spray pyrolysis deposition is a cost-effective process to deposit films of a wide variety of materials, especially solid oxides. In this study, spray pyrolysis deposition was used to deposit 2-3 μm thick Mn1.5Co1.5O4 spinel and Ta2O5-doped CeO2 on a ferritic stainless steel as protective coatings on SOFC interconnect. The coated samples were exposed to air at 1000oC to study the diffusion and oxidation behaviours. Characterization results indicated that the coatings are dense, have good adhesion to the substrate, and are stable and effective to prevent Cr outward diffusion at the high temperature