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Title: Selection and Evaluation of Heat-Resistant Alloys for Planar SOFC Interconnect Applications

Over the past several years, the steady reduction in SOFC operating temperatures to the intermediate range of 700~850oC [1] has made it feasible for lanthanum chromite to be supplanted by metals or alloys as the interconnect materials. Compared to doped lanthanum chromite, metals or alloys offer significantly lower raw material and fabrication costs. However, to be a durable and reliable, a metal or alloy has to satisfy several functional requirements specific to the interconnect under SOFC operating conditions. Specifically, the interconnect metal or alloy should possess the following properties: (i) Good surface stability (resistance to oxidation, hot corrosion, and carburization) in both cathodic (air) and anodic (fuel) atmospheres; (ii) Thermal expansion matching to the ceramic PEN (positive cathode-electrolyte-negative anode) and seal materials (as least for a rigid seal design); (iii) High electrical conductivity through both the bulk material and in-situ formed oxide scales; (iv) Bulk and interfacial thermal mechanical reliability and durability at the operating temperature; (v) Compatibility with other materials in contact with interconnects such as seals and electrical contact materials.
Authors:
; ; ;
Publication Date:
OSTI Identifier:
15004674
Report Number(s):
PNNL-SA-37017
AA2530000; TRN: US200322%%244
DOE Contract Number:
AC06-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: 2002 Fuel Cell Seminar: Fuel Cells - Reliable, Clean Energy for the World, November 19-21, 2002, Palm Springs, California. , 522-525
Publisher:
Fuel Cell Seminar, Washington, DC, United States(US).
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
30 DIRECT ENERGY CONVERSION; ALLOYS; CHROMIUM OXIDES; ELECTRIC CONDUCTIVITY; EVALUATION; FUEL CELLS; LANTHANUM OXIDES; RAW MATERIALS; SOLID OXIDE FUEL CELLS; THERMAL EXPANSION corrected author order, publisher info. and conference title, 10/02/2003 - mfl.