Abstract
Macroporous SiC ceramics and SiC/C composites have been successfully prepared from porous arylene-bridged polysilsesquioxane monoliths by the carbothermal reduction. The carbothermal reduction of the arylene-bridged polysilsesquioxane networks were investigated by FT-IR measurement, thermogravimetric analysis, and X-ray diffraction. Since the Si, O, and C atoms are well-distributed at the atomic level in the polysilsesquioxanes, the resultant SiC and SiC/C contained only a few O atoms after the carbothermal reduction, which indicates that the process of purification, such as washing with hydrofluoric acid to remove remaining SiO2, is not necessary. Besides, the well-defined macropores retained through the calcination in both systems. The SiC monoliths obtained from phenylene-bridged polysilsesquioxanes possessed not only macropores but also mesopores with narrow distribution as the interstices of the SiC crystallites, resulting in hierarchical pore structure. On the other hand, SiC/C composites obtained from biphenylene-bridged polysilsesquioxanes possessed large specific surface area and remarkably high porosity of >90 %.
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Hasegawa, G. (2013). Fabrication of Macroporous SiC and SiC/C Monoliths from Arylene-Bridged Polysilsesquioxanes via Carbothermal Reduction. In: Studies on Porous Monolithic Materials Prepared via Sol–Gel Processes. Springer Theses. Springer, Tokyo. https://doi.org/10.1007/978-4-431-54198-1_11
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