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Transport Through Electrophoretically Deposited CuMn1.8O4 Spinel Coatings on Crofer Interconnects

Published online by Cambridge University Press:  01 February 2011

Wenhua Huang ,
Srikanth Gopalan ,
Uday B. Pal  and
Soumendra Basu
Wenhua Huang
Affiliation:
wenhuah@bu.edu, Nanodynamics Energy Inc., Buffalo, New York, United States
Srikanth Gopalan
Affiliation:
sgopalan@bu.edu, Boston University, 02446, Massachusetts, United States
Uday B. Pal
Affiliation:
upal@bu.edu, Boston University, Brookline, Massachusetts, United States
Soumendra Basu
Affiliation:
basu@bu.edu, Boston University, 02446, Massachusetts, United States
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Abstract

Dense and well-adhered CuMn1.8O4 spinel oxide coatings were successfully deposited on Crofer 22 APU stainless steel substrates by a cost effective electrophoretic deposition technique. Coated and uncoated Crofer substrates were oxidized for 120 hours in air at 800°C. A diffusion model was developed for the oxidation of the coated alloys, which predicted para-linear oxidation kinetics. The effective diffusivities in the coating and in the thermally grown oxide were calculated to be 2×10-15 cm2/s and 2.5×10-16 cm2/s respectively, at 800°C. Area specific resistances (ASR) of thermally cycled samples at 800°C did not show a significant difference compared to the isothermally oxidized sample for the same total oxidation time, suggesting good coating adherence. The ASR of the coated alloys is projected to be around 3.8×10-2Ωcm2 after 50000 at 800°C in air, making them excellent candidates for interconnect applications for solid oxide fuel cells operated at 800°C or lower.

Keywords

oxidationcoatingelectrodeposition
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1126: Symposium S – Solid-State Ionics–2008 , 2008 , 1126-S11-05
Copyright
Copyright © Materials Research Society 2009

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