Conductive protection layers on oxidation resistant alloys for SOFC interconnect applications

Yang, Zhenguo; Xia, Guanguang; Maupin, Gary D.; Stevenson, Jeffry W.

doi:10.1016/j.surfcoat.2006.08.082

Cited by 177 publications

(80 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The oxidation rate of the Crofer 22 APU steel with the LSCF48 coating is 2.9 9 10 -14 g 2 cm -4 s -1 , which is approximately one order of magnitude lower than the corrosion rate of the steel without surface modification (3.7 9 10 -13 g 2 cm -4 s -1 ). The research conducted, thus, far by other authors [28,29] confirms that the screen-printed coating significantly inhibits oxide scale growth by reducing the supply of oxygen needed for the growth of chromia through the perovskite thick film (transport via oxygen vacancies). it follows that the oxidation process of both studied samples approximately obeyed the parabolic rate law.…”

Section: Calculation Of Mass Change During Cyclic Oxidationmentioning

confidence: 64%

Oxidation properties of the Crofer 22 APU steel coated with La0.6Sr0.4Co0.2Fe0.8O3 for IT-SOFC interconnect applications

Przybylski

Brylewski

Durda

et al. 2014

J Therm Anal Calorim

View full text Add to dashboard Cite

The La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 (LSCF48) cathode material was used as a protective-conducting coating on an interconnect made of Crofer 22 APU ferritic steel intended for application in intermediate-temperature solid oxide fuel cell (IT-SOFC) stacks. The LSCF48 coating was deposited on the surface of the steel via screen-printing followed by appropriate thermal treatment. The oxidation kinetics of the Crofer 22 APU steel-uncoated and coated with LSCF48-approximately obeys the parabolic rate law in air at 1,073 K under isothermal and cyclic oxidation conditions. The oxidation rate for uncoated steel is higher than that for coated steel. SEM-EDS and XRD investigations showed that the LSCF48 coating interacts with the steel during long-term oxidation in the afore-mentioned thermal conditions, and an intermediate multilayer interfacial zone is formed. This intermediate layer leads to lower area specific resistance in air at 1,073 K in comparison to the Crofer 22 APU steel without surface modification.

show abstract

Section: Calculation Of Mass Change During Cyclic Oxidationmentioning

confidence: 64%

Oxidation properties of the Crofer 22 APU steel coated with La0.6Sr0.4Co0.2Fe0.8O3 for IT-SOFC interconnect applications

Przybylski

Brylewski

Durda

et al. 2014

J Therm Anal Calorim

View full text Add to dashboard Cite

show abstract

“…• C in air, 35 and the thermal expansion coefficients of Mn 1.5 Co 1.5 O 4 and Crofer 22 APU are 11.4 * 10 −6 K −1 and 12.6 * 10 77 In the fabrication of the spinel protective coating layer, the intermediate heat-treatment in a reducing atmosphere could effectively enhance the film density and adhesion to the ferritic stainless steel substrate. 42,51 Upon exposure to a reducing atmosphere (4% H 2 -96% N 2 ) at 800…”

Section: Resultsmentioning

confidence: 99%

Highly Dense Mn-Co Spinel Coating for Protection of Metallic Interconnect of Solid Oxide Fuel Cells

Lee

Hong

Kim

et al. 2014

J. Electrochem. Soc.

View full text Add to dashboard Cite

The major degradation issues of solid oxide fuel cells (SOFC) are associated with the oxide scale growth and Cr evaporation of the metallic interconnect. To address these challenges, a highly dense spinel oxide coating was fabricated on a ferritic stainless steel interconnect using a cost-competitive ceramic processing route. The nano-scale Mn 1.5 Co 1.5 O 4 spinel powder was synthesized using a glycine-nitrate method, and the particle agglomerates were effectively disintegrated by a high-energy attrition milling process. The spinel protective coating, which was applied by screen printing, was sintered to a nearly full density, without causing damage to the metallic substrate, by a high-temperature annealing process in a reducing environment, followed by re-oxidation at a moderate temperature. The dense spinel coating remarkably reduced the growth rate of chromia scale and restrained the evaporation of chromium species, as verified by area specific resistance (ASR) measurements and analysis on chromium distribution over the cross-section. Strong adhesion between the coating and substrate was confirmed after 500-hour operation. The sintering mechanism involved in reduction-oxidation heat-treatment was studied based on dilatometry measurements and microstructural features. The implication of the ASR change and the chromium migration for stability of practical SOFC stacks was discussed in detail.

show abstract

“…Both of these lead to severe degradation in cell performance. Protective and conductive oxide coatings have been proposed to reduce the Cr volatilization in Cr-containing interconnect alloys, by acting as a barrier to Cr migration/transport [7][8][9][10][11]. The surface coating, if dense and crack free, is expected to act as a seal to the volatile Cr species, and provide oxidation protection for the metallic substrate.…”

Section: Introductionmentioning

confidence: 99%

Oxidation and Electrical Behavior of Mn-Co-Coated Crofer 22 APU Steel Produced by a Pack Cementation Method for SOFC Interconnect Applications

Ebrahimifar

Zandrahimi

2015

Oxid Met

View full text Add to dashboard Cite

An issue associated with chromia-scale formation on ferritic stainless steels is an associated increase in electrical resistance over time, due to the oxide growth. Further, the migration of chromium via chromia-scale evaporation into solid oxide fuel cell (SOFC) cathodes can result in degradation in cell electrochemical performance. In this research, manganese and cobalt were deposited by the pack cementation method onto Crofer 22 APU ferritic stainless steel. Isothermal and cyclic oxidation was carried out to evaluate the role of coating materials during oxidation. Area-specific resistance (ASR) of the Mn-Co-coated substrates was also tested at 800°C. The results demonstrate that the coating layer transforms to MnCo 2 O 4 , CoFe 2 O 4 , CoCr 2 O 4 , and Co 3 O 4 spinels during oxidation. This scale is protective, and acts as an effective barrier against chromium migration into the outer oxide. Mn-Co oxide and cobalt oxides also cause a reduction in ASR, in comparison to that of bare steel.

show abstract

Conductive protection layers on oxidation resistant alloys for SOFC interconnect applications

Cited by 177 publications

References 28 publications

Oxidation properties of the Crofer 22 APU steel coated with La0.6Sr0.4Co0.2Fe0.8O3 for IT-SOFC interconnect applications

Oxidation properties of the Crofer 22 APU steel coated with La0.6Sr0.4Co0.2Fe0.8O3 for IT-SOFC interconnect applications

Highly Dense Mn-Co Spinel Coating for Protection of Metallic Interconnect of Solid Oxide Fuel Cells

Oxidation and Electrical Behavior of Mn-Co-Coated Crofer 22 APU Steel Produced by a Pack Cementation Method for SOFC Interconnect Applications

Contact Info

Product

Resources

About