Materials World Network: Multi-Scale Study of Chemical Vapor Infiltrated Carbon/Carbon Composites

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The main goal is to enhance fundamental understanding of the interaction between complex hierarchchical microstructure and the mechanical behavior of carbon/carbon composites. To achieve this goal a combination of chemical engineering, non-destructive testing and characterization (polarized light microscopy, electron microscopy combined with selected area electron diffraction, micro-computed tomography, and atomic force microscopy) methods, and computational mechanics will be used. The objectives of this research are (a) to determine how nanotexture and microstructure of carbon/carbon composites is defined by the parameters of chemical vapor infiltration process, (b) develop a multi-scale numerical model relating microstructure on nano-, micro-, and meso-levels to the overall material properties, (c) propose methodology for fabrication of carbon/carbon composites with desirable microstructure and mechanical properties, (d) verify the approach by manufacturing the material under the prescribed conditions and performing microstructure characterization and mechanical testing, and (e) investigate stress concentrations and fracture induced by nanotexture of pyrolytic carbon and by thermal treatment of the composite.