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A Barium-Calcium Silicate Glass for Use as Seals in Planar SOFCs
Paper Type  |
Contributed Paper |
Title |
A Barium-Calcium Silicate Glass for Use as Seals in Planar SOFCs |
Author |
Prachaya Namwong, Nattapol Laorodphan, Worapong Thiemsorn, Manat Jaimasith, Anucha Wannakon, and Tor |
Email |
chato@chiangmai.ac.th |
|
Abstract: A barium-calcium silicate glass for use as seals in planar SOFCs with a chemical composition of 40.78mol%BaO-4.36mol%CaO-0.62mol%Al2O3-0.83mol%B2O3-47.41mol%SiO2 was studied. Its coefficient of thermal expansion (CTE) between 25-640oC, glass transformation temperature (Tg) and softening temperature (Ts), determined by dilatometry, were 10.6x10-6oC-1, 646oC and 694oC, respectively. Isothermal devitrification heat treatment at 800oC, which is in the intermediate operation temperature range of planar SOFCs, revealed surface crystallization of various crystalline phases identified by XRD and SEM-EDS as BaAl2Si2O8 (hexacelsian), BaSiO3 and BaCa2Si3O9 Kinetics of devitrification followed the . Johnson-Mehl-Avrami-Kolmogorov relationship with the Avrami exponent of 1.4. The overall CTE of the obtained glass-ceramic after the isothermal devitrification heat treatment was comparable to that of the glass. Adhesion test between the glass and the other components including YSZ and stainless steel grade AISI430 revealed that good union was achieved. The interfacial phenomena were studied by SEM-EDS and the mechanism of bonding were discussed.
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Start & End Page |
231 - 242 |
Received Date |
2009-12-30 |
Revised Date |
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Accepted Date |
2010-02-26 |
Full Text |
Download |
Keyword |
silicate glass, seals, planar solid-oxide fuel cells, interfacial phenomena, devitrification, thermal expansion, adhesion |
Volume |
Vol.37 No.2 (MAY 2010) |
DOI |
|
Citation |
Namwong P.,Laorodphan N.,Thiemsorn W.,Jaimasith M.,Wannakon A., et al., A Barium-Calcium Silicate Glass for Use as Seals in Planar SOFCs , Chiang Mai Journal of Science, 2010; 37(2): 231-242. |
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