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Influence of the carbon interface on the mechanical behavior of SiC/SiC composites

par Anne-Marie - publié le

SiC/SiC composites reinforced with 3rd generation SiC fibers are promising candidates for thermomechanical applications in high technology industries. Not all composites exhibit the same pseudo-ductile mechanical behavior one studied composite reaches higher failure strains than the other. In a study done in collaboration between DEN-Service de Recherches Métallurgiques Appliquées of CEA, MINES ParisTech at PSL, le Laboratoire PMC et le Synchrotron-SOLEIL the mechanical behavior of SiC/SiC composites is linked to the way Pyrolytic Carbon (PyC) is bonded to the fiber surface. Analyses have shown that these interactions and the Fiber/Matrix debonding behavior depend strongly on the nature of the carbon on the SiC fiber surface. Understanding the origin of this carbon has allowed elucidating the local interaction mechanisms of the studied SiC/SiC composites.

Left : TEM cross-section of the interface of SiC/PyC/SiC composites reinforced by HNS fibers. Right : High-resolution spectrum of carbon (C1s peak) of the surface of the TSA3 desized fibers measured at 700 eV.

C. Fellah et al. Composites Part A : Applied Science and Manufacturing 133, 105867 (2020)