There exists concern that glass-ceramic seal materials may not tolerate the high temperature gaseous environment in solid oxide fuel cell (SOFC) and solid oxide electrolysis cell (SOEC) applications, potentially leading to the poisoning of electrodes by silica and ultimate loss of hermeticity. A mechanism for the loss of silicon from glass seals has been proposed by other workers. To address this concern, material samples of proprietary glass-ceramics were exposed to steam/hydrogen atmospheres at 800 °C for up to 1000 h. The mass losses of the samples were measured at intervals and their changes in surface chemistry were analyzed using techniques such as X-ray photoelectron spectroscopy and dynamic secondary ion mass spectroscopy. It was shown that the extent of corrosion depends on composition and surface microstructure and that some glass-ceramics are particularly resistant to steam/hydrogen corrosion.
The mechanical properties of magnesium aluminium silicate (MAS) and lithium aluminium silicate (LAS) single fibers were investigated. The fibers were prepared using different methods namely melt drawing (MAS) and continuous drawing (LAS) respectively. The glass ceramic fibers were subjected to the optimized thermal treatments and tested using the single fiber test method (SFT) in order to obtain and evaluate their mechanical properties before and after crystallization. The tested fibers were further characterized by scanning electron microscopy (SEM) and the results showed that the average tensile strength values were a function of the gage length and the fiber diameters.
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