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

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

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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 °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. 
Original languageEnglish
Article number125093
JournalSurface and Coatings Technology
Volume380
Number of pages8
ISSN0257-8972
DOIs
Publication statusPublished - 2019

Keywords

  • Solid oxide fuel cell
  • Interconnect
  • Finite element model
  • Electrophoretic deposition
  • Coting
  • Oxidation

Cite this

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title = "Investigation of electrophoretic deposition as a method for coating complex shaped steel parts in solid oxide cell stacks",
abstract = "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 °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. ",
keywords = "Solid oxide fuel cell, Interconnect, Finite element model, Electrophoretic deposition, Coting, Oxidation",
author = "B. Talic and Wulff, {A. C.} and S. Molin and Andersen, {K. B.} and P. Zielke and Frandsen, {H. L.}",
year = "2019",
doi = "10.1016/j.surfcoat.2019.125093",
language = "English",
volume = "380",
journal = "Surface and Coatings Technology",
issn = "0257-8972",
publisher = "Elsevier",

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Investigation of electrophoretic deposition as a method for coating complex shaped steel parts in solid oxide cell stacks. / Talic, B.; Wulff, A. C.; Molin, S.; Andersen, K. B.; Zielke, P.; Frandsen, H. L.

In: Surface and Coatings Technology, Vol. 380, 125093, 2019.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Investigation of electrophoretic deposition as a method for coating complex shaped steel parts in solid oxide cell stacks

AU - Talic, B.

AU - Wulff, A. C.

AU - Molin, S.

AU - Andersen, K. B.

AU - Zielke, P.

AU - Frandsen, H. L.

PY - 2019

Y1 - 2019

N2 - 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 °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. 

AB - 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 °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. 

KW - Solid oxide fuel cell

KW - Interconnect

KW - Finite element model

KW - Electrophoretic deposition

KW - Coting

KW - Oxidation

U2 - 10.1016/j.surfcoat.2019.125093

DO - 10.1016/j.surfcoat.2019.125093

M3 - Journal article

VL - 380

JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

SN - 0257-8972

M1 - 125093

ER -