Abstract
A vacuum infiltration technique was used to infiltrate a SiC-based matrix phase, containing rare earth (Sc, Er and Yb) nitrate (10wt.%) as a sintering additive, into a 2D-woven Tyranno SiC fabric preform coated with pyrolytic carbon (PyC) for the fabrication of a dense SiCf/SiC composite. By inserting a SiC green tape, a high composite density >95% was achieved after hot pressing at 1750°C for 2h under a pressure of 20MPa. The effects of the addition of each rare earth nitrate on the density, microstructure and mechanical properties of the SiCf/SiC composites were investigated. In particular, Sc-nitrate was found to be the most effective sintering additive in terms of retaining an ultrafine grain size distribution and the retention of structural integrity by preserving the weak PyC interface. Finally on the basis of identified key failure mechanisms, a correlation between microstructure and variation of flexural strength was proposed.
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