A one-step densification approach of porous La0.6Sr0.4Co0.2Fe0.8O3-δ coatings towards high-temperature oxidation resistance application

Abstract

In high-temperature applications specifically in solid oxide fuel cells, the utilization of ceramic coatings on metal substrates is of utmost importance as it provides significant resistance to oxidation. In this study, for the first time, a simple and effective electrophoretic deposition approach is used to fabricate dense La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) coatings treated with methyl hydrogen polysiloxane (MHP). The structural and morphological analysis of pre-and post-treated LSCF coatings are extensively investigated using XRD, Raman spectroscopy, XPS, and SEM. Both densification and adhesion strength are observed to be enhanced significantly with the utilization of MHP solution. The wetting characteristics of the LSCF coating show a remarkable improvement over the underlying metallic substrate. After post-treatment of LSCF coating using MHP as the binder, the oxidation scaling rate was reduced by a factor of 3.6 and 2.6 compared to bare steel and LSCF untreated samples, respectively.

Keywords

• EPD
• Methyl hydrogen polysiloxane
• Hydrophobic
• High-temperature oxidation