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The microstructure of carbon/carbon composites obtained by chemical vapor infiltration of carbon‐fiber felts was studied comparatively by means of Raman spectroscopy, polarized light microscopy (PLM), scanning electron microscopy (SEM), and X‐ray diffraction. The matrices, which are homogeneously textured according to PLM, exhibit pronounced spatial structural gradients at the sub‐μm scale if investigated...
Statistical analysis procedure is proposed to characterize volume, shape and orientation distribution of pores in chemical vapor infiltrated carbon/carbon composites. The microstructure data is provided by X‐ray microtomography. To characterize orientation distribution of pores, probability distribution functions of pore volume, orientation angles and principal moments of inertia are constructed....
Thermal expansion of differently‐textured pyrolytic carbon matrices (pyrocarbons) of carbon/carbon composites was studied with a high temperature X‐ray diffraction at temperatures ranging from 25°C to 1400°C. The composites were synthesized by chemical vapor infiltration of a carbon fiber felt, using methane as a carbon source. From the linear dependence of the lattice displacement on temperature,...
Failure mechanisms observed in fractured carbon‐carbon composites by scanning electron microscopy. Left: intensive matrix splitting; Middle: pull‐out of fiber together with a matrix layer: Right: multiple crack deflection in fiber. By courtesy of B. Reznik
In this work, the linear elastic material properties of differently textured variants of pyrolytic carbon are homogenized from the submicro‐ to the micro‐scale. In high resolution transmission electron microscope (HRTEM) lattice fringe images, the microstructure of pyrolytic carbon manifests itself in terms of projections of graphene layers. According to their orientation distribution, different textures...
We used cube corner, Berkovich, cono‐spherical, and Vickers indenters to measure the indentation modulus of highly oriented bulk pyrolytic carbon both normal to and parallel to the plane of elastic isotropy. We compared the measurements with elastic constants previously obtained using strain gage methods and ultrasound phase spectroscopy. While no method currently exists to extract the anisotropic...
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