High-temperature glassy-ceramic sealants SiO2-Al2O3-BaO-MgO and SiO2-Al2O3-ZrO2-CaO-Na2 O for solid oxide electrochemical devices

作者：Qi, S.; Porotnikova, N. M.^*; Ananyev, M. V.; Kuzmin, A. V.; Eremin, V. A.; Pankratov, A. A.; Molchanova, N. G.; Reznitskikh, O. G.; Farlenkov, A. S.; Vovkotrub, E. G.; Zaikov, Yu. P.

来源：Transactions of Nonferrous Metals Society of China, 2016, 26(11): 2916-2924.

DOI：10.1016/S1003-6326(16)64421-7

• glassy-ceramic sealants
• SOFC
• YSZ
• Crofer22APU
• magnesium silicate

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 degrees C. Thermal properties of the chosen glass compositions and their compatibility with the SOFC materials (YSZ-electrolyte and alloy-interconnector Crofer22APU, 15X25T) 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 10.0x10(-6) degrees C-1 for glass 45% SiO2-15% Al2O3-25% BaO-15% MgO and 9.5x10(-6) degrees C-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.

• 出版日期2016-11
• 单位北京化工大学