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Conversion mechanisms of a polycarbosilane precursor into an SiC-based ceramic material

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Abstract

The pyrolysis of a PCS precursor has been studied up to 1600 °C through the analysis of the gas phase and the characterization of the solid residue by thermogravimetric analysis, extended X-ray absorption fine structure, electron spectrocopy for chemical analysis, transmission electron microscopy, X-ray diffraction, Raman and Auger electron spectroscopy microanalyses, as well as electrical conductivity measurements. The pyrolysis mechanism involves three main steps: (1) an organometallic mineral transition (550 < T p < 800 °C) leading to an amorphous hydrogenated solid built on tetrahedral SiC, Si02 and silicon oxycarbide entities, (2) a nucleation of SiC (1000 < T p < 1200 °C) resulting in SiC nuclei (less than 3 nm in size) surrounded with aromatic carbon layers, and (3) a SiC grain-size coarsening (T p > 1400 °C) consuming the residual amorphous phases and giving rise simultaneously to a probable evolution of SiO and CO. The formation of free carbon results in a sharp insulator-quasimetal transition with a percolation effect.

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Authors and Affiliations

  1. Laboratoire de Chimie du Solide du CNRS, Université de Bordeaux 1, 33405, Talence, France

    E. Bouillon, F. Langlais, R. Pailler & R. Naslain

  2. Laboratoire de Spectroscopie Moléculaire et Cristalline, Université de Bordeaux 1, 33405, Talence, France

    F. Cruege & P. V. Huong

  3. Centre d'Etudes Scientifiques et Techniques d'Aquitaine, CEA, 33114, Le Barp, France

    J. C. Sarthou & A. Delpuech

  4. LURE, Bt 209D, Université de Paris-Orsay, 91405, Orsay, France

    C. Laffon & P. Lagarde

  5. Laboratoire Marcel Mathieu, Université de Pau, 2 av. du Pdt. P. Angot, 64000, Pau, France

    M. Monthioux & A. Oberlin

Authors
  1. E. Bouillon
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  2. F. Langlais
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  3. R. Pailler
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  4. R. Naslain
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  5. F. Cruege
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  6. P. V. Huong
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  7. J. C. Sarthou
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  8. A. Delpuech
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  9. C. Laffon
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  10. P. Lagarde
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  11. M. Monthioux
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  12. A. Oberlin
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Bouillon, E., Langlais, F., Pailler, R. et al. Conversion mechanisms of a polycarbosilane precursor into an SiC-based ceramic material. J Mater Sci 26, 1333–1345 (1991). https://doi.org/10.1007/BF00544474

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  • DOI: https://doi.org/10.1007/BF00544474

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