Investigation of electrophoretic deposition as a method for coating complex shaped steel parts in solid oxide cell stacks

SURFACE & COATINGS TECHNOLOGY

卷:380

Article

Talic, B.¹  Wulff, A. C.¹  Molin, S.¹  Andersen, K. B.¹  Zielke, P.¹  Frandsen, H. L.¹ 

[1] Tech Univ Denmark, Dept Energy Convers & Storage, Frederiksborgvej 399, DK-4000 Roskilde, Denmark

关键词: Solid oxide fuel cell;    Interconnect;    Finite element model;    Electrophoretic deposition;    Coating;    Oxidation;   

DOI  :  10.1016/j.surfcoat.2019.125093

来源: Elsevier

【 摘 要 】

Electrophoretic deposition (EPD) is a promising method for coating complex shaped interconnects and contact components for solid oxide fuel cells and electrolyzers. In this work, we employ a combination of finite element modelling and experiments to assess the effect of substrate curvature on the fabrication of a Mn1.5Co1.5O4 coating by EPD. The coating is deposited on steel substrates machined to create a well-defined curvature and on a Crofer 22 H steel grid. We find that post-deposition sintering of the coated steel substrate may lead to crack formation in concave surfaces, while a defect-free coating is achieved at convex surfaces. The formation of cracks is found to depend on a complex interplay between the coating thickness, the sintering procedure, and the substrate curvature radius. Oxidation testing in air at 750 degrees C showed that the Mn1.5Co1.5O4 coating reduced the oxidation rate of the Crofer 22 H steel grid. Sintering the coating by a two-step reduction and re-oxidation procedure resulted in a more protective coating showing a greater tendency for crack healing compared to sintering the coating in air only.

【 授权许可】

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