Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10629707 | Journal of the European Ceramic Society | 2012 | 10 Pages |
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 Ã 10â8 kg2/m4/s at 1200 °C and 1.31 Ã 10â7 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.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Shibo Li, Gui-Ming Song, Yang Zhou,