Thermal Properties of Na2O-MgO-TiO2-Al2O3-B2O3-SiO2 Glasses and Prospects for Their Use for Sealing Solid Oxide Fuel Cells

• Published in: Russian journal of applied chemistry 2019-07, Vol.92 (7), p.902-908
• Main Authors: Papko, L. F., Dyadenko, M. V., Kuz’min, A. V., Krainova, D. A., Saetova, N. S., Raskovalov, A. A.
• Format: Article
• Language: English
• Subjects: Aluminum oxide; Atomic beam spectroscopy; Boron oxides; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Dilatometry; Inductively coupled plasma; Industrial Chemistry/Chemical Engineering; Inorganic Synthesis and Industrial Inorganic Chemistry; Magnesium oxide; Mathematical analysis; Sealants; Silicon dioxide; Solid oxide fuel cells; Thermal expansion; Thermodynamic properties; Titanium dioxide; Transition points
• ISSN: 1070-4272; 1608-3296
• DOI: 10.1134/S1070427219070048

A series of Na 2 O-MgO-TiO 2 -Al 2 O 3 -B 2 O 3 -SiO 2 glasses promising as sealants for solid oxide fuel cells are prepared. The glassy state is confirmed by X-ray diffraction analysis, and the elemental composition is determined by inductively coupled plasma atomic emission spectroscopy. The coefficient of thermal expansion (CTE) is calculated from the dilatometric data; it varies within (69–77) × 10 −7 K −1 and increases with the MgO to Al 2 O 3 concentration ratio. The CTE calculation by the Appen method gives the results that are underestimated by 5–8% relative to the experimental data. The temperature dependences of the heat capacity of the glasses are determined by differential scanning calorimetry and calculated using the Kopp-Neumann rule. Comparison of the calculated values with the experimental data shows that the Kopp-Neumann rule is observed for the systems under consideration with relatively high accuracy. The sensitivity of different methods in determination of the glass transition point has been evaluated.