Alumina composites containing two different sizes and various compositions of Cr3C2 were pressurelessly sintered at 1550°C for 2h in a purified Ar atmosphere. The chemical stability of chromium carbide, microstructure, densification and mechanical properties were studied. The phase stability of Cr3C2 was found quite sensitive to the temperature and oxygen content in the sintering environment. The addition of Cr3C2 played an important role in the grain growth of alumina. Coalescence of Cr3C2 was observed along the grain boundaries of alumina in samples containing high Cr3C2. By controlling the phase stability, and the amount and particle size of Cr3C2, a flexural strength of 500 MPa, 57% enhancement, was obtained.
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry