Jy. Ofori et Sv. Sotirchos, STRUCTURAL MODEL EFFECTS ON THE PREDICTIONS OF CHEMICAL-VAPOR INFILTRATION MODELS, Journal of the Electrochemical Society, 143(6), 1996, pp. 1962-1973
The effects of pore structure evolution on the predictions of chemical
vapor infiltration models are investigated in this study. A general m
ulticomponent reaction and transport model is used to describe transpo
rt and reaction in the pore space, and structure evolution is modeled
by representing the void space by a population of cylindrical capillar
ies (capillary models) or of the solid phase by a population of solid
cylinders (fiber models). The capillaries are assumed to be randomly a
rranged in space without preferred orientation, whereas the fibers are
taken to be parallel to a line, parallel to a plane, or without prefe
rred orientation (one- two- or three-directional structures, respectiv
ely). The obtained results show that the way in which the pore structu
re evolves during densification plays a dramatic role in determining t
he overall behavior of the deposition system. In the case of the fiber
structures, the results are influenced significantly not only by the
directionality but by the direction of diffusion relative to the fiber
axes as well.