Chemistry and kinetics of chemical vapor deposition of pyrolytic carbon from ethanol
| Autor: | G. Schoch, Olaf Deutschmann, Aijun Li, S. Zhang, Sven Lichtenberg, Boris Reznik |
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| Rok vydání: | 2011 |
| Předmět: |
Reaction mechanism
Materials science Mechanical Engineering General Chemical Engineering Chemical vapor deposition Reversible reaction Methane Reaction rate chemistry.chemical_compound chemistry Chemical engineering Chemical vapor infiltration Organic chemistry Pyrolytic carbon Physical and Theoretical Chemistry Pyrolysis |
| Zdroj: | Proceedings of the Combustion Institute. 33:1843-1850 |
| ISSN: | 1540-7489 |
| Popis: | Synthesis of pyrolytic carbon as a matrix for carbon fiber reinforced carbon composites by chemical vapor infiltration (CVI) is studied experimentally and numerically using the oxygen-containing precursor ethanol. The effects of residence time on microstructure and deposition rate of pyrolytic carbon are investigated. A short residence time is found to favor the formation of high-textured pyrolytic carbon. The evolutions of microstructure and deposition rate of pyrolytic carbon are compared with those of carbon deposited from methane. Compared to methane, ethanol exhibits a much higher deposition rate of pyrolytic carbon with similar microstructures. Pyrolysis of ethanol is modeled using a two-dimensional flow model coupled with a detailed gas-phase reaction mechanism involving 261 species taking part in 1177 reversible reactions. Reaction rate analysis reveals that C3-hydrocarbons are the most important intermediate species contributing to the maturation of gas-phase composition. A comparison of the kinetic predictions with equilibrium calculations demonstrates that the CVD reactor applied is operated far away from equilibrium. |
| Databáze: | OpenAIRE |
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