Mechanical Properties of Thin Pyrolitic Carbon Interphase SiC–Matrix Composites Reinforced with Near-Stoichiometric SiC Fibers
Tensile properties of Tyranno™-SA near-stoichiometric silicon carbide (SiC)-fiber–reinforced chemically vapor-infiltrated SiC-matrix composites with pyrolytic carbon interphases were experimentally studied. The influence of interphase thickness in a range of 60–300 nm on the tensile properties of the materials appeared to be generally minor. Thin interphase (<100 nm) did not have a significant deteriorating effect on composite properties, which has commonly been reported for conventional SiC-fiber composites. For very thin interphase (<60 nm) composites, a slight decrease in fracture strain and a substantial increase in interfacial sliding stress were noted. Increases in ultimate tensile strength and fracture strain were observed at a much thicker interphase (>600 nm) at the expense of composite stiffness.
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Document Type: Research Article
Affiliations: Metals and Ceramics Division, Oak Ridge National Laboratory, PO Box 2008, Oak Ridge, Tennessee 37831
Publication date: November 1, 2005