TY - BOOK
T1 - Reliability of Materials and Components for Solid Oxide Fuel Cells
AU - Trejo, Rosa
AU - Shyam, Amit
AU - Guo, Qianying
AU - Mcclurg, Dana
AU - Kirkham, Melanie
AU - Lance, Michael J.
AU - Cakmak, Ercan
AU - Lara-Curzio, Edgar
PY - 2024/3
Y1 - 2024/3
N2 - Planar stack solid-oxide fuel cells (SOFCs) require seals that must operate reliably under demanding conditions for lifetimes of 40000 hours. This includes temperature fluctuations between 800°C and RT during on and off cycles, thermal stresses, oxidizing environments and chemical degradation to name a few. This comprehensive report provides results from long term testing of two commercially available multicomponent barium alkali silicate glasses: SCN and G6, chosen as sealing candidates. In this scope, the glass seals were deposited on YSZ and Al2O3 substrates simulating electrolytes (Zrbased) and coatings (both zirconia and Al2O3). The seal-substrate couples were subjected to 800°C under air and steam+H2+N2 environments up to 40000 hours to test their integrity under real operating conditions. Extensive studies on the effects of exposure have been conducted over the span of testing at various time intervals. Within the context of characterization, mechanical properties such as density, roughness, thermal expansion and glass transition, viscosity and wettability behavior; and microstructural properties such as glass chemistries, defect formation (cracks and pores), phase transformations (devitrification) and glass-interface reactions are investigated. Results and discussions are provided with a focus on the degradation of the properties over long term interrupted testing.
AB - Planar stack solid-oxide fuel cells (SOFCs) require seals that must operate reliably under demanding conditions for lifetimes of 40000 hours. This includes temperature fluctuations between 800°C and RT during on and off cycles, thermal stresses, oxidizing environments and chemical degradation to name a few. This comprehensive report provides results from long term testing of two commercially available multicomponent barium alkali silicate glasses: SCN and G6, chosen as sealing candidates. In this scope, the glass seals were deposited on YSZ and Al2O3 substrates simulating electrolytes (Zrbased) and coatings (both zirconia and Al2O3). The seal-substrate couples were subjected to 800°C under air and steam+H2+N2 environments up to 40000 hours to test their integrity under real operating conditions. Extensive studies on the effects of exposure have been conducted over the span of testing at various time intervals. Within the context of characterization, mechanical properties such as density, roughness, thermal expansion and glass transition, viscosity and wettability behavior; and microstructural properties such as glass chemistries, defect formation (cracks and pores), phase transformations (devitrification) and glass-interface reactions are investigated. Results and discussions are provided with a focus on the degradation of the properties over long term interrupted testing.
KW - 30 DIRECT ENERGY CONVERSION
U2 - 10.2172/2429858
DO - 10.2172/2429858
M3 - Commissioned report
BT - Reliability of Materials and Components for Solid Oxide Fuel Cells
CY - United States
ER -