Abstract
Poly(carbosilane) or PCS, {–CH2–SiH(CH3)–} n , is used as a Si-bearing precursor in combination with a coal tar pitch to study thermally induced transformations toward SiC-modified carbon composites. Following mixing of the components in the molten pitch at 160°C, the mixture is heated under argon atmosphere at 500°C yielding a solid carbonizate that is further subjected to separate pyrolysis experiments at 1300°C or 1650°C. At temperatures up to 500°C, the PCS reacts with suitable pitch components as well as undergoing decomposition reactions. At higher temperatures, clusters of prevailingly nanocrystalline β-SiC are confirmed after the 1650°C pyrolysis step with indications that the formation of the compound starts at 1300°C. 29Si MAS NMR, XRD, FT-IR, XPS, and elemental analysis are used to characterize each pyrolysis step, especially, from the viewpoint of transformation of silicon species to silicon carbide in the carbon matrix evolved from the pitch.
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Czosnek, C., Janik, J.F. & Olejniczak, Z. Silicon Carbide Modified Carbon Materials. Formation of Nanocrystalline SiC from Thermochemical Processes in the System Coal Tar Pitch/Poly(carbosilane). Journal of Cluster Science 13, 487–502 (2002). https://doi.org/10.1023/A:1021171511204
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DOI: https://doi.org/10.1023/A:1021171511204