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Title: Effects of Oxide Thickness on Scale and Interface Stresses under Isothermal Cooling and Micro-Indentation for Ferritic Stainless Steel Interconnect

Abstract

Interconnects in solid oxide fuel cells (SOFCs) provide the electrical connection between the individual cells, as well as separate the anode air from the cathode fuel for each cell. In this paper, we study the thermal stresses in the oxide scale and at the oxide/substrate interface for Cr-Fe based interconnect (IC), e.g. Crofer 22 APU, during cooling. The ultimate goal is to predict the interconnect life under typical operating conditions and thermal cycles. In general, very high compressive in-plane stresses are predicted in the oxide layer during cooling. High shear stress is also predicted on the oxide/substrate interface. The predicted shear stress on the interface will be used to compare with the experimentally determined bond strength to predict delamination. Finite element analyses are also performed for indentation test: high shear stress is predicted on the oxide/substrate interface, and the interfacial crack growth is predicted to be mode II driven.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
921409
Report Number(s):
PNNL-SA-53415
AA2530000; TRN: US200804%%802
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
ECS Transactions, 5(1):357-368
Additional Journal Information:
Journal Volume: 5; Journal Issue: 1
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; 36 MATERIALS SCIENCE; AIR; ANODES; CATHODES; CRACK PROPAGATION; OXIDES; SHEAR; SOLID OXIDE FUEL CELLS; STAINLESS STEELS; STRESSES; THERMAL STRESSES; THICKNESS

Citation Formats

Sun, Xin, Liu, Wenning N, Vetrano, John S, Yang, Z Gary, Recknagle, Kurtis P, and Khaleel, Mohammad A. Effects of Oxide Thickness on Scale and Interface Stresses under Isothermal Cooling and Micro-Indentation for Ferritic Stainless Steel Interconnect. United States: N. p., 2007. Web. doi:10.1149/1.2729017.
Sun, Xin, Liu, Wenning N, Vetrano, John S, Yang, Z Gary, Recknagle, Kurtis P, & Khaleel, Mohammad A. Effects of Oxide Thickness on Scale and Interface Stresses under Isothermal Cooling and Micro-Indentation for Ferritic Stainless Steel Interconnect. United States. https://doi.org/10.1149/1.2729017
Sun, Xin, Liu, Wenning N, Vetrano, John S, Yang, Z Gary, Recknagle, Kurtis P, and Khaleel, Mohammad A. 2007. "Effects of Oxide Thickness on Scale and Interface Stresses under Isothermal Cooling and Micro-Indentation for Ferritic Stainless Steel Interconnect". United States. https://doi.org/10.1149/1.2729017.
@article{osti_921409,
title = {Effects of Oxide Thickness on Scale and Interface Stresses under Isothermal Cooling and Micro-Indentation for Ferritic Stainless Steel Interconnect},
author = {Sun, Xin and Liu, Wenning N and Vetrano, John S and Yang, Z Gary and Recknagle, Kurtis P and Khaleel, Mohammad A},
abstractNote = {Interconnects in solid oxide fuel cells (SOFCs) provide the electrical connection between the individual cells, as well as separate the anode air from the cathode fuel for each cell. In this paper, we study the thermal stresses in the oxide scale and at the oxide/substrate interface for Cr-Fe based interconnect (IC), e.g. Crofer 22 APU, during cooling. The ultimate goal is to predict the interconnect life under typical operating conditions and thermal cycles. In general, very high compressive in-plane stresses are predicted in the oxide layer during cooling. High shear stress is also predicted on the oxide/substrate interface. The predicted shear stress on the interface will be used to compare with the experimentally determined bond strength to predict delamination. Finite element analyses are also performed for indentation test: high shear stress is predicted on the oxide/substrate interface, and the interfacial crack growth is predicted to be mode II driven.},
doi = {10.1149/1.2729017},
url = {https://www.osti.gov/biblio/921409}, journal = {ECS Transactions, 5(1):357-368},
number = 1,
volume = 5,
place = {United States},
year = {Mon Apr 30 00:00:00 EDT 2007},
month = {Mon Apr 30 00:00:00 EDT 2007}
}