Reaction sintering process of tyranno SA/SiC composites and their characterization

This paper deals with the efficiency of fiber preform preparation route for the fabrication of reaction sintering (RS) SiC_f/SiC composites and their characterization, including density, microstructure and mechanical property. The applicability of carbon interfacial layer has been investigated in the RS process. The fiber preform was prepared by the consecutive slurry infiltration process, which associated with the combination of constant gas impregnation pressure and different magnitudes of cold pressure. The consecutive slurry infiltration process used for the preparation of fiber preform can be regarded as a promising technique for high density RS-SiC_f/SiC composites, even if their mechanical properties depend on the magnitudes of cold pressure used. RS-SiC_f/SiC composites entirely showed the morphology of near stoichiometric SiC phase in the intra-fiber bundle matrix, compared to that in the inter-fiber bundle matrix. The carbon interfacial layer was insufficient for the pseudo-ductile failure of RS-SiC_f/SiC composites, even if some amount of fiber pull-out and interfacial delamination was observed in the tensile surface of bending test sample.