A low silica, barium borate glass-ceramic for use as seals in planar SOFCs |
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Authors: | Nattapol Laorodphan Worapong Thiemsorn Anucha Wannagon |
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Affiliation: | a Department of Industrial Chemistry, Faculty of Science, Chiang Mai University, 239 Huey-Kaew Road, Chiang Mai 50202, Thailand b Department of Physics, Faculty of Science, Chiang Mai University, Chiang Mai 50202, Thailand c National Metal and Materials Technology Center, Patumthani 12120, Thailand |
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Abstract: | A low silica, barium borate glass-ceramic for use as seals in planar SOFCs containing 64 mol%BaO, 3 mol%Al2O3 and 3 mol%SiO2 was studied. Coefficient of thermal expansion (CTE) between 275-550 °C, glass transition temperature (Tg), and dilatometric softening point (Ts) of the parent glass were 11.9 × 10−6 °C−1, 552 °C, and 558 °C, respectively. Glass-ceramic was produced by devitrification heat treatment at 800 °C for 100 h. It was found that nucleation heat treatment, seeding by 3 wt%ZrO2 as glass-composite and pulverization affected the amount, size and distribution of crystalline phases. SEM-EDS and XRD results revealed that crystalline phases presented in the devitrified glass-ceramic were barium aluminate (BaAl2O4), barium aluminosilicate (BaAl2Si2O8) possibly with boron associated in its crystal structure, and barium zirconate (BaZrO3). CTE of the devitrified glass-ceramic was in the range of (10.1-13.0) × 10−6 °C−1. Good adhesion was obtained both in the cases of glass and devitrified glass-ceramic with YSZ and AISI430 stainless steel. Interfacial phenomena between these components were discussed. |
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Keywords: | 81.05.Kf 81.05.Je 81.20.Vj |
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