La0.8Sr0.2MnO3 and (Mn1.5Co1.5)O4 double layer coated by electrophoretic deposition on Crofer22 APU for SOEC interconnect applications

Electrophoretic deposition (EPD) was employed to coat (Mn1.5Co1.5)O4 spinel layer and La0.8Sr0.2MnO3 layer on Crofer22 APU to improve its corrosion resistance for SOEC interconnect applications. Coatings were obtained by following five steps: (1) charging of the individual particles in suspension in a suitable organic liquid, (2) deposition of (Mn1.5Co1.5)O4 onto Crofer22 APU, (3) heat treatment of the (Mn1.5Co1.5)O4 spinel layer, (4) deposition of La0.8Sr0.2MnO3 layer on (Mn1.5Co1.5)O4 spinel layer and (5) sintering the double coated layers. The coated double layers on Crofer22 APU were sintered at 1200 °C for 2 h in argon atmosphere to form a dense film. Microstructural evaluation indicated that the double layers inhibited outward diffusion of chromium. ASR of the La0.8Sr0.2MnO3 layer coated Crofer22 APU with the (Mn1.5Co1.5)O4 spinel protection layers showed excellent long-term stability and electrical performance.