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Theses

Modélisation Multi-échelle de l'infiltration chimique à partir de la phase vapeur de composites à renforts fibreux

Abstract : Ceramic matrix composites and carbon fiber reinforced carbon composites are dedicated to high temperature applications. They consist of a stacked fibrous arrangement, woven or not, coated by matrix. Chemical Vapor Infiltration (CVI) is a popular processing route, where a preform (fibers with or without a first matrix) is placed inside a furnace. Precursor gases are then injected, enter the preform and generate matrix formation by heterogeneous chemical reaction. Experimental optimization of CVI is long and costly, triggering the need for a numerical model. The creation of such a tool has been the objective set for this thesis. Two programs were first developed and validated. Each is linked to a specific material scale: microscopic (fiber scale) and macroscopic (composite scale). Both are based on a random walk algorithm and require three-dimensional representations of the preform. X-ray tomography scans of C/C and SiC/SiC composite preforms were performed at the desired scales. The fiber scale program was used for computation of geometrical, diffusive and reactive properties in several regions of the relevant image. Correlations between these properties are created and inserted into the composite scale program for numerical infiltration. In the case of C/C composites, this multi-scale tool was coupled to a chemical model for anticipation, under various operating conditions, of matrix thickness and microtexture. Densification previsions on different SiC/SiC composites enabled their direct comparison as well as a measure of their infiltrability.
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https://tel.archives-ouvertes.fr/tel-00669342
Contributor : William Ros <>
Submitted on : Monday, February 13, 2012 - 9:14:35 AM
Last modification on : Thursday, July 26, 2018 - 12:07:46 PM
Long-term archiving on: : Monday, May 14, 2012 - 2:21:49 AM

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  • HAL Id : tel-00669342, version 1

Citation

William Ros. Modélisation Multi-échelle de l'infiltration chimique à partir de la phase vapeur de composites à renforts fibreux. Matériaux. Université Sciences et Technologies - Bordeaux I, 2011. Français. ⟨tel-00669342⟩

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