LI Shuting ^{1, 2}, PENG Jun ^{1, 2}, LIU Yuanyuan ^{2, 3}, CAI Changkun ^{1, 2}, AN Shengli ^{1, 2}
(1. School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010,
Inner Mongolia, China; 2. Inner Mongolia Key Laboratory of Advanced Ceramic Materials and Devices, Baotou
014010, Inner Mongolia, China; 3. College of Chemistry and Chemical Engineering, Inner Mongolia
University of Science and Technology, Baotou 014010, Inner Mongolia, China)

Abstract: Al₂O₃-SiO₂-B₂O₃-Na₂O system glass materials were prepared by using high-temperature melting method. The effect of Al₂O₃content on sealing performance of the Al₂O₃-SiO₂-B₂O₃-Na₂O glass materials was studied. At the same time, phase transition of the material system was calculated by using FactSage thermodynamic software to determine the content and phase composition of sealing materials with optimal performance. The effect of Al₂O₃on thermal expansion coefficient of the glass sealing materials was experimentally studied. The sealing material was applied to CeO₂ based electrolyte of solid oxide fuel cells. The actual working temperature of the glass sealing material was increased from 700 ℃ to 780 ℃, as the content of Al₂O₃was increased from 10 wt.% to 30 wt.%. The thermal expansion coefficients of the glass sealing materials were 11.25×10⁻⁶ K⁻¹, 11.21×10⁻⁶ K⁻¹ and 11.15×10⁻⁶ K⁻¹, respectively, which were close to that of GDC electrolyte (10.94×10⁻⁶ K⁻¹). The sealing material had high stability, which meet the requirements of IT-SOFCs sealing
materials.
Key words: Al₂O₃-SiO₂-B₂O₃-Na₂O glass; sealing material; solid oxide fuel cells; thermal expansion coefficient