Article,
Direct 3D microscale imaging of carbon-carbon composites with computed holotomography
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, (2003)
DOI: DOI: 10.1016/S0168-583X(02)01693-2
Abstract
As part of the modelling of chemical vapor infiltration, one of the
processing techniques of carbon-carbon composites, a better understanding
of the relation between fiber architecture and transport properties
is required. An excellent starting point for the pore-scale modeling
of heat and gas transport is the acquisition of 3D images of the
porous media through computed microtomography at various densification
stages. Due to the low X-ray absorption rate of light materials such
as carbon, a poor image contrast is obtained with absorption tomography.
On the other hand, phase contrast imaging is readily feasible using
the coherence properties of modern synchrotron beams. Holotomography
has been performed on these materials and it provides quantitative
density images where fibers and pyrocarbon matrix deposit are easily
distinguishable. Such images are appropriate for the pore-scale computation
of many effective transport properties.
