J. Phys. IV France 10 (2000) Pr2-9-Pr2-17
Interaction between a reactive preform and the surrounding gas-phase during CVIG.L. Vignoles, C. Descamps and N. Reuge
Laboratoire des Composites Thermostructuraux, 3 allée la Boétie, Domaine Universitaire, 33600 Pessac, France
An integrated modelling approach of Chemical Vapour Infiltration of a fibrous preform by methyltrichlorosilane, featuring coupled reactor fluid mechanics and porous medium gas transport has been developed. The coupling between transport/reaction phenomena inside and outside the preform is rather strong, both physically and numerically. An important counter-effect of the reactive preform on the surrounding gas-phase composition is evidenced ; also, an appreciable dissymmetry of the densification rate inside the preform, even with negligible convective transport inside it. Such an approach brings new informations for understanding the physico-chemical phenomena of CVI and new guidelines for preform densification optimisation.
© EDP Sciences 2000