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

• Published in: Journal of materials research Vol. 22; no. 6; pp. 1537 - 1550
• Main Authors: Vignoles, Gerard L., Coindreau, Olivia, Ahmadi, Azita, Bernard, Dominique
• Format: Journal Article
• Language: English
• Published: New York, USA Cambridge University Press 01.06.2007
• Subjects: Diffusion; Thermal conductivity; X-ray tomography; X-ray tomography; Diffusion; Thermal conductivity
• ISSN: 0884-2914; 2044-5326
• DOI: 10.1557/JMR.2007.0216

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.