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Title: Oxidation Behavior and Electrical Properties of NiO- and Cr 2O 3- Forming Alloys for Solid Oxide Fuel Cell Interconnects.

Abstract

The goal of this paper was to determine if NiO-forming alloys are a viable alternative to Cr{sub 2}O{sub 3}-forming alloys for solid-oxide fuel-cell (SOFC) metallic interconnects. The oxide-scale growth kinetics and electrical properties of a series of Li- and Y{sub 2}O{sub 3}-alloyed, NiO-forming Ni-base alloys and La-, Mn-, and Ti-alloyed Fe-18Cr-9W and Fe-25Cr base ferritic Cr{sub 2}O{sub 3}-forming alloys were evaluated. The addition of Y{sub 2}O{sub 3} and Li reduced the NiO scale growth rate and increased its electrical conductivity. The area-specific-resistance (ASR) values were comparable to those of the best (lowest ASR) ferritic alloys examined. Oxidation of the ferritic alloys at 800 C in air and air+10% H{sub 2}O (water vapor) indicated that Mn additions resulted in faster oxidation kinetics/thicker oxide scales, but also lower oxide scale ASRs. Relative in-cell performance in model SOFC stacks operated at 850 C indicated a 60-80% reduction in ASR by Ni+Y{sub 2}O{sub 3}, Ni+Y{sub 2}O{sub 3}, Li, and Fe-25Cr+La,Mn,Ti interconnects over those made from a baseline, commercial Cr{sub 2}O{sub 3}-forming alloy. Collectively, these results indicate that NiO-forming alloys show potential for use as metallic interconnects.

Authors:
 [1];  [1];  [2];  [1];  [3];  [3];  [1];  [1];  [1]
  1. ORNL
  2. Tennessee Technological University
  3. TMI Inc
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Shared Research Equipment Collaborative Research Center
Sponsoring Org.:
FE USDOE - Office of Fossil Energy (FE)
OSTI Identifier:
931614
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Oxidation of Metals; Journal Volume: 65; Journal Issue: 3/4
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; AIR; ALLOYS; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; KINETICS; OXIDATION; OXIDES; PERFORMANCE; SOLID OXIDE FUEL CELLS; WATER

Citation Formats

Brady, Michael P, Pint, Bruce A, Lu, Z G, Zhu, Jiahong, Milliken, C, kreidler, E, Miller, Leslie S, Armstrong, Timothy R., and Walker, Larry R. Oxidation Behavior and Electrical Properties of NiO- and Cr2O3- Forming Alloys for Solid Oxide Fuel Cell Interconnects.. United States: N. p., 2006. Web. doi:10.1007/s11085-006-9018-x.
Brady, Michael P, Pint, Bruce A, Lu, Z G, Zhu, Jiahong, Milliken, C, kreidler, E, Miller, Leslie S, Armstrong, Timothy R., & Walker, Larry R. Oxidation Behavior and Electrical Properties of NiO- and Cr2O3- Forming Alloys for Solid Oxide Fuel Cell Interconnects.. United States. doi:10.1007/s11085-006-9018-x.
Brady, Michael P, Pint, Bruce A, Lu, Z G, Zhu, Jiahong, Milliken, C, kreidler, E, Miller, Leslie S, Armstrong, Timothy R., and Walker, Larry R. Sun . "Oxidation Behavior and Electrical Properties of NiO- and Cr2O3- Forming Alloys for Solid Oxide Fuel Cell Interconnects.". United States. doi:10.1007/s11085-006-9018-x.
@article{osti_931614,
title = {Oxidation Behavior and Electrical Properties of NiO- and Cr2O3- Forming Alloys for Solid Oxide Fuel Cell Interconnects.},
author = {Brady, Michael P and Pint, Bruce A and Lu, Z G and Zhu, Jiahong and Milliken, C and kreidler, E and Miller, Leslie S and Armstrong, Timothy R. and Walker, Larry R},
abstractNote = {The goal of this paper was to determine if NiO-forming alloys are a viable alternative to Cr{sub 2}O{sub 3}-forming alloys for solid-oxide fuel-cell (SOFC) metallic interconnects. The oxide-scale growth kinetics and electrical properties of a series of Li- and Y{sub 2}O{sub 3}-alloyed, NiO-forming Ni-base alloys and La-, Mn-, and Ti-alloyed Fe-18Cr-9W and Fe-25Cr base ferritic Cr{sub 2}O{sub 3}-forming alloys were evaluated. The addition of Y{sub 2}O{sub 3} and Li reduced the NiO scale growth rate and increased its electrical conductivity. The area-specific-resistance (ASR) values were comparable to those of the best (lowest ASR) ferritic alloys examined. Oxidation of the ferritic alloys at 800 C in air and air+10% H{sub 2}O (water vapor) indicated that Mn additions resulted in faster oxidation kinetics/thicker oxide scales, but also lower oxide scale ASRs. Relative in-cell performance in model SOFC stacks operated at 850 C indicated a 60-80% reduction in ASR by Ni+Y{sub 2}O{sub 3}, Ni+Y{sub 2}O{sub 3}, Li, and Fe-25Cr+La,Mn,Ti interconnects over those made from a baseline, commercial Cr{sub 2}O{sub 3}-forming alloy. Collectively, these results indicate that NiO-forming alloys show potential for use as metallic interconnects.},
doi = {10.1007/s11085-006-9018-x},
journal = {Oxidation of Metals},
number = 3/4,
volume = 65,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}