Mechanical reliability and life prediction of coated metallic interconnects within solid oxide fuel cells

Xu, Zhijie; Xu, Wei; Stephens, Elizabeth; Koeppel, Brian

doi:10.1016/j.renene.2017.06.103

Mechanical reliability and life prediction of coated metallic interconnects within solid oxide fuel cells

Journal Article · Mon Jul 03 00:00:00 EDT 2017 · Renewable Energy

DOI:https://doi.org/10.1016/j.renene.2017.06.103· OSTI ID:1368407

Xu, Zhijie ^[1]; Xu, Wei ^[2]; Stephens, Elizabeth ^[3]; Koeppel, Brian ^[3]

Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Computational Mathematics Group, Physical and Computational Sciences Directorate
Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Computational Engineering Group, Physical and Computational Sciences Directorate
Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Energy & Environment Directorate

Metallic cell interconnects (IC) made of ferritic stainless steels, i.e., iron-based alloys, have been increasingly favored in the recent development of planar solid oxide fuel cells (SOFCs) because of their advantages in excellent imperviousness, low electrical resistance, ease in fabrication, and cost effectiveness. Typical SOFC operating conditions inevitably lead to the formation of oxide scales on the surface of ferritic stainless steel, which could cause delamination, buckling, and spallation resulting from the mismatch of the coefficient of thermal expansion and eventually reduce the lifetime of the interconnect components. Various protective coating techniques have been applied to alleviate these drawbacks. In the present work, a fracture-mechanics-based quantitative modeling framework has been established to predict the mechanical reliability and lifetime of the spinel-coated, surface-modified specimens under an isothermal cooling cycle. Analytical solutions have been formulated to evaluate the scale/substrate interfacial strength and determine the critical oxide thickness in terms of a variety of design factors, such as coating thickness, material properties, and uncertainties. In conclusion, the findings then are correlated with the experimentally measured oxide scale growth kinetics to quantify the predicted lifetime of the metallic interconnects.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830; AC06-76RL01830

OSTI ID:: 1368407

Alternate ID(s):: OSTI ID: 1550235
OSTI ID: 1566758

Report Number(s):: PNNL-SA--120828; PII: S0960148117306079

Journal Information:: Renewable Energy, Journal Name: Renewable Energy Journal Issue: C Vol. 113; ISSN 0960-1481

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Initial Oxidation Behavior of Ferritic Stainless Steel Interconnect with Sputtered NiFe2 Alloy Coating Zhao, Qingqing; Geng, Shujiang; Chen, Gang Oxidation of Metals, Vol. 93, Issue 3-4 https://doi.org/10.1007/s11085-019-09954-6	journal	January 2020

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