Journal of Materials Research

Articles

Assessment of geometrical and transport properties of a fibrous C/C composite preform as digitized by x-ray computerized microtomography: Part II. Heat and gas transport properties

Gerard L. Vignolesa1 c1, Olivia Coindreaua1, Azita Ahmadia2 and Dominique Bernarda3

a1 Université Bordeaux 1, Laboratoire des Composites ThermoStructuraux (LCTS) 3, Allée La Boëtie, F33600 Pessac, France

a2 Université Bordeaux 1, Transport, Ecoulements Fluides, Energétique (TREFLE), Esplanade des Arts et Métiers, F33405 Talence, France

a3 Centre National de la Recherche Scientifique (CNRS), Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), 26 Avenue du Dr. Schweitzer, F33608 Pessac Cedex, France

Abstract

Raw and partially infiltrated carbon–carbon composite preforms have been scanned by high-resolution synchrotron radiation x-ray computerized microtomography. Three-dimensional high-quality images of the pore space have been produced at two distinct resolutions and have been used for the computation of transport properties: heat conductivity, binary gas diffusivities, Knudsen diffusivities, and viscous flow permeabilities. The computation procedures are based on a double change-of-scale strategy suited to the bimodal nature of pore space and on the local determination of transport anisotropy. Good agreement has been found between all calculated quantities and experimental data.

(Received October 27 2006)

(Accepted January 05 2007)

Key Words:

  • Diffusion;
  • Thermal conductivity;
  • X-ray tomography

Correspondence:

c1 Address all correspondence to this author. e-mail: vinhola@lcts.u-bordeaux1.fr

Footnotes

Part I of this paper was published in J. Mater. Res.20(9), 2328. DOI: 10.1557/JMR.2005.0311

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