Novel alkaline earth silicate sealing glass for SOFC, Part II: sealing and interfacial microstructure

Journal Article · Tue Jul 10 04:00:00 EDT 2007 · Journal of Power Sources, 170(2):395-400

DOI:https://doi.org/10.1016/j.jpowsour.2007.03.060· OSTI ID:917568

Chou, Y S; Stevenson, Jeffry W; Gow, Robert N

This is the second part of a study of a novel Sr-Ca-Ni-Y-B silicate sealing glass for solid oxide fuel cells (SOFC). Part I of the study addresses the effect of NiO on glass forming, thermal, and mechanical properties, and is presented in the preceding paper. In this paper (Part II), candidate composite glass with 10v percent NiO was tested for sealing standard coupons of Ni/YSZ anode-supported YSZ electrolyte bilayer and metallic interconnect Crofer22APU at various temperatures. Samples sealed at the highest temperature (1050 degrees C) showed hermetic seal after fully reduction and 10 thermal cycles. The interfacial microstructure characterization showed no distinct reactions at the interfaces of glass/YSZ or glass/metal, though some segregation of Ni was found along the glass/metal interface. Possible reactions were discussed. Overall the composite glass with 10v percent NiO appeared to be a good candidate for SOFC sealing.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 917568
• Report Number(s): PNNL-SA-54292; AA2530000
• Journal Information: Journal of Power Sources, 170(2):395-400, Journal Name: Journal of Power Sources, 170(2):395-400 Journal Issue: 2 Vol. 170; ISSN JPSODZ; ISSN 0378-7753
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
ELECTROLYTES
GLASS
MECHANICAL PROPERTIES
MICROSTRUCTURE
SEGREGATION
SILICATES
SOFC
SOLID OXIDE FUEL CELLS
composite
glass seal
interface
leak rate