中國有色金屬學(xué)報(bào)(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 26 No. 11 November 2016 |
（1. College of Material Sciences and Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
2. Institute of High-Temperature Electrochemistry of UB RAS, Ekaterinburg 620137, Russia;
3. Ural Federal University named after the First President of Russia B. N. Yeltsin, Ekaterinburg 620002, Russia）
Abstract:Glasses of the SiO2-Al2O3-BaO-MgO and SiO2-Al2O3-ZrO2-CaO-Na2O systems were synthesized in the perspective to apply them as sealants in SOFC at operating temperatures of 700-900 °C. Thermal properties of the chosen glass compositions and their compatibility with the SOFC materials (YSZ-electrolyte and alloy-interconnector Crofer22APU, 15Х25Т) were investigated by means of synchronic thermal analysis and high-temperature dilatometry. The elemental analysis was performed by atomic emission spectroscopy. The average values of the temperature coefficients of the linear extension are 10.0×10-6 °С-1 for glass 45%SiO2- 15%Al2O3-25%BaO-15%MgO and 9.5×10-6 °С-1 for glass 60%SiO2-10%Al2O3-10%ZrO2-5%CaO-15%Na2O. The gluing microstructure in YSZ/glass/Crofer22APU was studied by scanning electron microscopy. The crystallization process of silicate phases was revealed to occur in the SiO2-Al2O3-BaO-MgO glass. The analysis of the crystallization products was performed by Raman spectroscopy and X-ray diffraction. Glassy ceramics was proved to possess better parameters in comparison with amorphous glass to be used as a sealant in electrochemical sensors and oxygen sensors. The SiO2-Al2O3-ZrO2-CaO-Na2O low-temperature amorphous glass can be applied in SOFC.
Key words: glassy-ceramic sealants; SOFC; YSZ; Crofer22APU; magnesium silicate
