Corrosion of Borosilicate Sealing Glasses for Molten Carbonate Fuel Cells
Corrosion of Borosilicate Sealing Glasses for Molten Carbonate Fuel Cells
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熔融碳酸盐燃料电池用硼硅酸盐密封玻璃的腐蚀
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
R. Berjoan
中科院分区：
文献类型：
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作者：
M. Pascual;L. Pascual;F. J. Valle;A. Durán;R. Berjoan
开发用于熔融碳酸盐燃料电池（MCFC）的新型密封剂需要研究熔融碳酸盐对选定材料的侵蚀。与其他玻璃相比，二氧化硅和 Pyrex® 玻璃对熔融碳酸盐具有更好的耐腐蚀性，但它们的热膨胀系数不合适。还对适合 MCFC 和二氧化硅密封剂热膨胀的硼硅酸盐玻璃与 Pyrex® 玻璃进行了比较。熔融碳酸盐中的腐蚀动力学遵循两个限制关系并涉及两种腐蚀机制。重量损失随时间线性变化，表明玻璃网络在短时间内溶解。较长的时间显示出腐蚀，具体取决于时间的平方根，这是典型的扩散机制，表明在玻璃表面形成了保护层。主要结晶腐蚀产物是偏硅酸锂。玻璃腐蚀率遵循著名的阿伦尼乌斯定律。这些研究使用了扫描电子显微镜、X 射线衍射、X 射线光电子能谱和化学分析。提出了硼硅酸盐玻璃在熔融碳酸盐中的一般腐蚀机理。
The development of a new sealant for molten carbonate fuel cells (MCFC) requires a study of the attack of molten carbonates on selected materials. Silica and Pyrex® glasses have better corrosion resistance against molten carbonates than other glasses, but they have unsuitable thermal expansion coefficients. Comparisons have also been made between borosilicate glasses of suitable thermal expansion for sealants for MCFC and silica and Pyrex® glasses. The corrosion kinetics in molten carbonates follows two limiting relations and involves two corrosion mechanisms. The weight loss varied linearly with time, indicating a dissolution of the glass network at short times. Longer times show corrosion, depending on the square root of time, typical of a diffusion mechanism and indicating formation of a protective layer on the surface of the glass. The main crystalline corrosion product is lithium methasilicate. The glass-corrosion rate follows the well-known Arrhenius law. These studies used scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and chemical analysis. A general corrosion mechanism of borosilicate glasses in molten carbonates is proposed.