Oxidation resistance of novel ferritic stainless steels alloyed with titanium for SOFC interconnect applications

Journal Article · Thu May 15 04:00:00 EDT 2008 · Journal of Power Sources

DOI:https://doi.org/10.1016/j.jpowsour.2008.02.010· OSTI ID:935011

Jablonski, P D; Alman, D E

Chromia (Cr2O3) forming ferritic stainless steels are being developed for interconnect application in Solid Oxide Fuel Cells (SOFC). A problem with these alloys is that in the SOFC environment chrome in the surface oxide can evaporate and deposit on the electrochemically active sites within the fuel cell. This poisons and degrades the performance of the fuel cell. The development of steels that can form conductive outer protective oxide layers other than Cr2O3 or (CrMn)3O4 such as TiO2 may be attractive for SOFC application. This study was undertaken to assess the oxidation behavior of ferritic stainless steel containing 1 weight percent (wt.%) Ti, in an effort to develop alloys that form protective outer TiO2 scales. The effect of Cr content (6–22 wt.%) and the application of a Ce-based surface treatment on the oxidation behavior (at 800° C in air+3% H2O) of the alloys was investigated. The alloys themselves failed to form an outer TiO2 scale even though the large negative {delta}G of this compound favors its formation over other species. It was found that in conjunction with the Ce-surface treatment, a continuous outer TiO2 oxide layer could be formed on the alloys, and in fact the alloy with 12 wt.% Cr behaved in an identical manner as the alloy with 22 wt.% Cr.

• Research Organization: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
• Sponsoring Organization: USDOE - Office of Fossil Energy (FE)
• OSTI ID: 935011
• Report Number(s): DOE/NETL-IR-2008-231; NETL-TPR-2005
• Journal Information: Journal of Power Sources, Journal Name: Journal of Power Sources Journal Issue: 1 Vol. 180; ISSN 0378-7753
• Publisher: Elsevier B.V.
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
36 MATERIALS SCIENCE
ADSORPTION HEAT
ALLOYS
CHEMISORPTION
Cr poisoning
FUEL CELLS
Ferritic steel
MORPHOLOGY
OXIDATION
OXIDES
Oxidation
PENTACENE
PERFORMANCE
SILICON
SOFC Interconnect
SOLID OXIDE FUEL CELLS
SORPTIVE PROPERTIES
STAINLESS STEELS
STEELS
SURFACE TREATMENTS
Surface treatment
TITANIUM