It is widely accepted that the mechanical behavior of high-temperature composite materials reinforced by SiC fibers is highly depend on the interphase between fibers and matrix. To replace the phenomenological understanding of adhesion, tribology and the interface/fracture mechanics by atomic-scale mechanisms it is necessary to investigate the nanoscopic nature of interphases. The purpose of this work is to develop and to characterize the interfacial coatings for SiC (Hi-Nicalon, Hi-Nicalon-S, Tyranno-SA) reinforced fibers for ceramic matrix composites. As interfacial coatings, the refractory oxides, including stabilized zirconia, for SiC fibers have been investigated. The surface chemistry, morphology, composition, topography, roughness, local mechanical and adhesive properties of interphases were evaluated by different analytical techniques, including SEM/EDS, TEM, XPS, XRD, AFM, micro Raman analysis. Direct apparent adhesion force mapping measurements on as-received and coated fibers were performed by AFM. The obtained results provide new insights into composite material mechanical performance.

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1. The development of components for high-temperature ceramic matrix composites