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Modelling Chemical Vapour Infiltration in C/C composites: numerical tools based on µ-CT images

Abstract : In the production of high-quality Ceramic-Matrix Composites, matrix preparation is often made by Chemical Vapor Infiltration (CVI), a process which involves many phenomena such as gas transport, chemical reactions, and structural evolution of the preform. Control and optimization of this high-tech process are demanding for modeling tools. In this context, a numerical simulation of CVI in complex 3D images, acquired e.g. by X-ray Computerized Microtomography, has been developed. The approach addresses the two length scales which are inherent to a composite with woven textile reinforcement (i.e. inter- and intra-bundle), with two numerical tools. The small-scale program allows direct simulation of CVI in small intra-bundle pores. Effective laws for porosity, surface and transport properties as infiltration proceeds are produced by averaging. They are an input for the next modeling step. The second code is a large-scale solver which accounts for the locally heterogeneous and anisotropic character of the pore space. Simulation of the infiltration of a whole composite material part is possible with this program. Validation of these tools on test cases, as well as some examples on actual materials, are shown and discussed.
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  • HAL Id : hal-01322828, version 1

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Gerard Vignoles, Olivia Coindreau, William Ros, Ivan Szelengowicz, Christianne Mulat, et al.. Modelling Chemical Vapour Infiltration in C/C composites: numerical tools based on µ-CT images. HT-CMC 7 – 7th International Conference On High-Temperature Ceramic-Matrix Composites, W. Krenkel; J. Lamon, Sep 2010, Bayreuth, Germany. pp.598-606. ⟨hal-01322828⟩

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