Barium silicates as high thermal expansion seals for solid oxide fuel cells studied by high-temperat
Barium silicates as high thermal expansion seals for solid oxide fuel cells studied by high-temperat
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DOI：
10.1016/j.jpowsour.2011.04.035
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发表时间：
2011-09
期刊：
影响因子：
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通讯作者：
Marita Kerstan;C. Rüssel
中科院分区：
文献类型：
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作者：
Marita Kerstan;C. Rüssel
固体氧化物燃料电池中金属和陶瓷之间的气密密封可以由玻璃制成，这种玻璃可以使具有高热膨胀系数的相结晶（主要是硅酸钡）。本文主要报道了这些硅酸盐的高温x射线衍射研究。结果表明，所有硅酸钡的热膨胀系数范围为10.5 ~ 15.4 × 10−6K−1（100-800℃）。膨胀强烈依赖于各自的结晶轴。正硅酸盐和偏硅酸盐的热膨胀系数最大。密封玻璃的热膨胀系数归因于晶体相和残余玻璃相的热膨胀。就时效而言，相的形成也应小心地加以控制。具有高热膨胀系数的晶体相，如硅酸钡，是这种密封玻璃的有利成分。
Gas-tight seals between metals and ceramics in solid-oxide fuel cells can be fabricated from glasses which enable the crystallization of phases with high thermal expansion coefficients (mostly barium silicates). This article mainly reports on high-temperature X-ray diffraction studies on these silicates. It is shown that all barium silicates exhibit thermal expansion coefficients in the range from 10.5 to 15.4 × 10−6K−1(100–800 °C). The expansions are strongly dependent on the respective crystallographic axis. The ortho- and metasilicates exhibit the largest thermal expansion coefficients. The coefficient of thermal expansion of a sealing glass is attributed to the thermal expansion of the crystalline phases and the residual glassy phase. The phase formation should carefully be controlled also with respect to aging. Crystalline phases with high coefficients of thermal expansion, such as the barium silicates, are advantageous as components in such sealing glasses.