Deposition and Evaluation of Protective PVD Coatings on Ferritic Stainless Steel SOFC Interconnects

Journal Article · Thu Sep 21 00:00:00 EDT 2006 · Journal of the Electrochemical Society, 153(10):A1886-A1893

DOI:https://doi.org/10.1149/1.2266244· OSTI ID:893243

Gorokhovsky, Vladimir I; Gannon, Paul; Deibert, Max; Smith, Richard J; Kayani, Asghar N; Kopczyk, M; Van Vorous, D; Yang, Z Gary; Stevenson, Jeffry W; Visco, s; jacobson, c; Kurokawa, H; Sofie, Stephen W

Reduced operating temperatures (600-800°C) of Solid Oxide Fuel Cells (SOFCs) may enable the use of inexpensive ferritic steels as interconnects. Due to the demanding SOFC interconnect operating environment, protective coatings are gaining attention to increase longterm stability. In this study, large area filtered arc deposition (LAFAD) and hybrid filtered arc assisted electron beam physical vapor deposition (FA-EBPVD) technologies were used for deposition of two-segment coatings with Cr-Co-Al-O-N based sublayer and Mn-Co-O top layer. Coatings were deposited on ferritic steel and subsequently annealed in air for various time intervals. Surface oxidation was investigated using RBS, SEM and EDS analyses. Cr volatilization was evaluated using a transpiration apparatus and ICP-MS analysis of the resultant condensate. Electrical conductivity (Area Specific Resistance) was studied as a function of time using the four-point technique with Ag electrodes. The oxidation behavior, Cr volatilization rate, and electrical conductivity of the coated and uncoated samples are reported. Transport mechanisms for various oxidizing species and coating diffusion barrier properties are discussed.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 893243
• Report Number(s): PNNL-SA-50054; AA2530000; TRN: US200625%%149
• Journal Information: Journal of the Electrochemical Society, 153(10):A1886-A1893, Journal Name: Journal of the Electrochemical Society, 153(10):A1886-A1893
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
30 DIRECT ENERGY CONVERSION
COATINGS
DEPOSITION
DIFFUSION BARRIERS
ELECTRIC CONDUCTIVITY
ELECTRODES
ELECTRON BEAMS
EVAPORATION
FERRITIC STEELS
OXIDATION
PHYSICAL VAPOR DEPOSITION
PROTECTIVE COATINGS
RUTHERFORD BACKSCATTERING SPECTROSCOPY
SOLID OXIDE FUEL CELLS
STABILITY
STAINLESS STEELS
TRANSPIRATION
TRANSPORT
ferritic steel
arc-assisted
SOFC interconnect