Development and characterizations of BaO-CaO-Al2O3-SiO2 glass-ceramic sealants for intermediate temperature solid oxide fuel cell application |
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Authors: | Saswati Ghosh |
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Institution: | Fuel Cell and Battery Division, Central Glass and Ceramic Research Institute, 196, Raja S.C. Mullick Road, West Bengal, Kolkata 700 032, CSIR, India |
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Abstract: | Several compositions based on BaO-CaO-Al2O3-SiO2 (BCAS) glass system have been studied in this investigation to see their applicability as sealant for solid oxide fuel cell (SOFC). The glasses as well as the corresponding glass-ceramics have been systematically characterized by differential thermal analysis, dilatometry, X-ray diffractometry, electron microscopy and impedance analysis to examine their suitability as sealant. While the glass transition temperature (Tg) determined from DTA are within 600-665 °C, the coefficient of thermal expansion (CTE) can be tailored between 9.5 and 13.0 × 10−6 K−1. These glasses are found to be well adhered with metallic interconnects, such as commercial ferritic steel (Crofer22APU), at an optimum sealing temperature of 850 °C. The shrinkage behavior of the developed glasses in their pellet form has also been investigated. The resistivities of the glass-ceramics, as obtained from impedance analysis, are found to be within 104-106 Ω cm at 800 °C. Under sandwiched condition between two metals, some of the developed compositions are found to maintain this high resistivity even after 100 h of operation. One of the glass compositions has shown a low leak-rate of the order of ∼10−7 Pa m2 s−1. |
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Keywords: | 61 43 Fs 82 47 Ed 61 05 &minus a 65 40 De 68 37 Hk |
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