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High-temperature glassy-ceramic sealants SiO_2-Al_2O_3-BaO-MgO and SiO_2-Al_2O_3-ZrO_2-CaO-Na_2O for solid oxide electrochemical devices

引用

Transactions of Nonferrous Metals Society of China 2016年第11期26卷 2916-2924页

作者： S.QI N.M.pOROTNIKOVA M.V.ANANYEV A.V.KUZMIN V.A.EREMIN A.A.pANKRATOV N.G.MOLCHANOVA O.G.REZNITSKIKH A.S.FARLENKOV E.G.VOVKOTRUB yu.p.zaikov 北京化工大学材料科学与工程学院北京100029 Institute of High-Temperature Electrochemistry of UB RAS Ekaterinburg 620137Russia Ural Federal University named after the First president of Russia B.N.Yeltsin Ekaterinburg 620002Russia

Glasses of the SiO_2-Al_2O_3-BaO-MgO and SiO_2-Al_2O_3-ZrO_2-CaO-Na_2O 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 Crofer22 ApU, 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%SiO_2-15%Al_2O_3-25%BaO-15%MgO and 9.5×10^(-6) °С^(-1) for glass 60%SiO_2-10%Al_2O_3-10%ZrO_2-5%CaO-15%Na_2O. The gluing microstructure in YSZ/glass/Crofer22 ApU was studied by scanning electron microscopy. The crystallization process of silicate phases was revealed to occur in the SiO_2-Al_2O_3-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 SiO_2-Al_2O_3-ZrO_2-CaO-Na_2O low-temperature amorphous glass can be applied in SOFC.

关键词： glassy-ceramic sealants SOFC YSZ Crofer22ApU magnesium silicate

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Diffusion in the aged aluminium film on iron

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Chinese physics B 2017年第3期26卷 569-574页

作者： A Y Galashev O R Rakhmanova V A Kovrov yu.p.zaikov Institute of High-Temperature Electrochemistry Ural Branch of Russian Academy of Sciences Yekaterinburg 620990 Russia

Metallic coatings of many types can be applied to steel to provide outstanding, long-term corrosion protection. A thin A1 film is studied at an Fe substrate by the molecular dynamics method at temperatures ranging from 300 K to 1173 K. A1 atoms are found to penetrate the Fe matrix at a temperature of 873 K. The potential energy of the system changes step-like at a temperature of 1173 K. At such temperature mean square atomic displacement significantly changes. The behaviors of the A1 and Fe diffusion coefficients are mainly determined by the temperature dependence of the diffusion activation energy.

关键词： aluminium film diffusion coefficients iron molecular dynamics

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