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Interfacial fracture between an individual fiber and the pyrocarbon matrix in carbon/carbon composites has been studied in a 300kV high-resolution transmission electron microscope (TEM) by using an integrated TEM-atomic force microscope piezodriven holder. Force vs. displacement curves were acquired by bending a part of a carbon fiber perpendicular to the transverse section of the fiber. The process...
The microstructure of carbon/carbon composites obtained by isothermal, isobaric chemical vapor infiltration (CVI) of carbon fiber preforms consisting of aligned fiber bundles separated by fiber fleeces was studied comparatively by polarized light microscopy (PLM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) combined with selected area electron diffraction (SAED)....
The effects of needle-punched felt structure, including mass ratio of non-woven cloth to short-cut fiber web, PAN-based carbon fiber types of non-woven cloth and thickness of unit (one layer of non-woven cloth and short-cut web was named as a unit), on the flexural properties of C/C composites from pressure gradient CVI are discussed. Results show that flexural strength and modulus increase when mass...
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