Article ID Journal Published Year Pages File Type
10629707 Journal of the European Ceramic Society 2012 10 Pages PDF
Abstract
A dense SiC/Ti3Si(Al)C2 composite was synthesized by in situ hot pressing powders of Si, TiC and Al as a sintering additive at 1500 °C for 2 h under 30 MPa in Ar atmosphere. This composite has a fine-grained and homogeneous microstructure with grain sizes of 5 μm for Ti3Si(Al)C2 and of 1 μm for SiC. The SiC/Ti3Si(Al)C2 composite possesses an improved oxidation resistance, with parabolic rate constants of 4.57 × 10−8 kg2/m4/s at 1200 °C and 1.31 × 10−7 kg2/m4/s at 1300 °C. This study provides an experimental evidence to confirm the formation of amorphous phases in the oxide scale of the SiC/Ti3Si(Al)C2 composite. Microstructure and phase composition of the SiC/Ti3Si(Al)C2 composite and oxide scales were identified by X-ray diffractometry and scanning electron microscopy. The mechanism for the enhanced oxidation resistance has been discussed.
Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
Authors
, , ,