The film-boiling densification process for C/C composite fabrication: From local scale to overall optimization

Vignoles, Gérard L.; Goyhénèche, Jean‐Marc; Sébastian, Patrick; Puiggali, Jean‐Rodolphe; Lines, J.-F.; Lachaud, Jean; Delhaès, P.; Trinquecoste, M.

doi:10.1016/j.ces.2006.04.025

Cited by 38 publications

(24 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In carbon CVI, gaseous or liquid precursors diffuse or are forced into a heated fiber preform placed in a reactor the details of which are described elsewhere (Benzinger and Hüttinger, 1998;Hu and Hüttinger, 2001;Vignoles et al, 2006). In the porous structure, the precursor undergoes a complex chemical reaction network, eventually forming solid matrix deposits on the surface of the fibers.…”

Section: Introductionmentioning

confidence: 99%

Transient modeling of chemical vapor infiltration of methane using multi-step reaction and deposition models

Deutschmann

2007

Chemical Engineering Science

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Transient modeling of chemical vapor infiltration of methane using multi-step reaction and deposition models

Deutschmann

2007

Chemical Engineering Science

View full text Add to dashboard Cite

“…The second one is approximating the media as the capillary Bethe lattices. The third one is estimating the effective diffusivity by empirical tortuosity factors, which is a lumped one accounting for the connectivity of the pore space, an extension of the path that the gas should cross, and the size and shape nonuniformity in the pore cross section. In the case of gas transport in macropore structures of woven fabric, the related articles are few .…”

Section: Introductionmentioning

confidence: 99%

Modeling of Pore Structure Evolution Between Bundles of Plain Woven Fabrics During Chemical Vapor Infiltration Process: The Influence of Preform Geometry

et al. 2012

View full text Add to dashboard Cite

A three‐dimensional model combining the nonconservative level set method and the steady‐state diffusion equation is presented for studying evolving pore structure between bundles of plain woven fabrics during chemical vapor infiltration process. Parametric studies have been conducted to determine the sensitivity of the evolution of structural properties and effective gas diffusion coefficients to the geometric parameters of the preform. Based on our results, some analytical expressions are proposed to estimate the evolution of structural properties and the tortuosity. The prediction of the presented models is well consistent with the existing data of experiments.

show abstract

“…One of the issues in ceramic-matrix composites (CMC) or carbon/carbon composites (CCC) fabrication is the precise knowledge of the ability that an arrangement of fibers (the preform) has to let itself be infiltrated by gaseous precursors of the matrix, resulting in the densest possible material (Ofori and Sotirchos, 1996b). Chemical Vapor Infiltration (CVI) is the generic name of the gas-phase route processes that are currently employed (Naslain and Langlais, 1990;Besmann et al, 1991); many configurations make use of strong thermal gradients in order to monitor better the localization of the chemical deposition reaction inside the porous medium Vignoles et al, 2006). Low pressures are also common in CVI, since it is a convenient way to reduce the Thiele modulus ; accordingly, the Knudsen number is usually not negligible.…”

Section: Latinmentioning

confidence: 99%

Rarefied Pure Gas Transport in Non-isothermal Porous Media: Validation and Tests of the Model

et al. 2008

Self Cite

View full text Add to dashboard Cite

Abstract. Viscous flow, effusion, and thermal transpiration are the main gas transport modalities for a rarefied gas in a macro-porous medium. They have been well quantified only in the case of simple geometries. This paper presents a numerical method based on the homogenization of kinetic equations producing effective transport properties (permeability, Knudsen diffusivity, thermal transpiration ratio) in any porous medium sample, as described e. g.by a digitized 3D image. The homogenization procedure -neglecting the effect of gas density gradients on heat transfer through the solid -leads to closure problems in R 6 for the obtention of effective properties ; they are then simplified using a Galerkin method based on a 21-element basis set. The kinetic equations are then discretized in R 3 space with a finite-volume scheme. The method is validated against experimental data in the case of a closed test tube. It shows to be coherent with past approaches of thermal transpiration. Then, it is applied to several 3D images of increasing complexity. Another validation is brought by comparison with other distinct numerical approaches for the evaluation of the Darcian permeability tensor and of the Knudsen diffusion tensor. Results show that thermal transpiration has to be described by an effective transport tensor which is distinct from the other tensors.

show abstract

The film-boiling densification process for C/C composite fabrication: From local scale to overall optimization

Cited by 38 publications

References 33 publications

Transient modeling of chemical vapor infiltration of methane using multi-step reaction and deposition models

Transient modeling of chemical vapor infiltration of methane using multi-step reaction and deposition models

Modeling of Pore Structure Evolution Between Bundles of Plain Woven Fabrics During Chemical Vapor Infiltration Process: The Influence of Preform Geometry

Rarefied Pure Gas Transport in Non-isothermal Porous Media: Validation and Tests of the Model

Contact Info

Product

Resources

About