Compliant alkali silicate sealing glass for solid oxide fuel cell applications: Combined stability in isothermal ageing and thermal cycling with YSZ coated ferritic stainless steels

Journal Article · Sun Jan 01 00:00:00 EST 2012 · Journal of Power Sources

DOI:https://doi.org/10.1016/j.jpowsour.2011.09.027· OSTI ID:1032676

Chou, Y S; Thomsen, Edwin C; Choi, Jung-Pyung; Stevenson, Jeffry W

An alkali-containing silicate glass (SCN-1) is currently being evaluated as a candidate sealing glass for solid oxide fuel cell (SOFC) applications. The glass contains about 17 mole% alkalis (K+Na) and has low glass transition and softening temperatures. It remains vitreous and compliant around 750-800oC after sealing without substantial crystallization, as contrary to conventional glass-ceramic sealants, which experience rapid crystallization after the sealing process. The glassy nature and low characteristic temperatures can reduce residual stresses and result in the potential for crack healing. In a previous study, the glass was found to have good thermal cycle stability and was chemically compatible with YSZ coating during short term testing. In the current study, the compliant glass was further evaluated in a more realistic way in that the sealed glass couples were first isothermally aged for 1000h followed by thermal cycling. High temperature leakage was measured. The chemical compatibility was also investigated with powder mixtures at 700 and 800oC to enhance potential interfacial reaction. In addition, interfacial microstructure was examined with scanning electron microscopy and evaluated with regard to the leakage and chemical compatibility results.

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1032676
• Report Number(s): PNNL-SA-82493; JPSODZ; AA2530000; TRN: US201202%%276
• Journal Information: Journal of Power Sources, Vol. 197, Issue 1; ISSN 0378-7753
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
36 MATERIALS SCIENCE
COATINGS
COMPATIBILITY
CRYSTALLIZATION
GLASS
HEALING
MICROSTRUCTURE
MIXTURES
RESIDUAL STRESSES
SCANNING ELECTRON MICROSCOPY
SILICATES
SOLID OXIDE FUEL CELLS
STABILITY
STAINLESS STEELS
TESTING
THERMAL CYCLING
sealing glass
compliant glass
YSZ coating
SOFC