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Chiang Mai Journal of Science, Faculty of Science, Chiang Mai University
 


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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.
Start & End Page 
231 - 242
Received Date 
2009-12-30
Revised Date 
Accepted Date 
2010-02-26
Full Text 
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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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