Abstract
The fracture mechanical properties of SiC particle reinforced Al2O3 matrix composites were investigated at room temperature and T= 1200°C. The results showed that the fracture strength and toughness of composites are enhanced, compared with those of monolithic Al2O3, especially at elevated temperature, and the strength and toughness of composites increase with the increase in the content of SiC particles. It was found that the improvement in fracture mechanical properties of composites is due to the fracture mode transformation from intergranular in monolithic Al2O3 to transgranular in the composites, and the fracture mode change might result mainly from the pinning effect of SiC particles on the Al2O3 boundaries. The study on flexure creep behavior of monolithic Al2O3 and the composites with 20 vol% SiC particles at T = 1260°C indicated that the composites also exhibited some improvement in their creep resistance, compared to the creep behavior of monolithic Al2O3, due to the pinning effect of SiC particles at Al2O3 grain boundaries on grain boundary sliding during creeping.
| Original language | English |
|---|---|
| Pages (from-to) | 501-508 |
| Number of pages | 8 |
| Journal | Journal of the European Ceramic Society |
| Volume | 18 |
| Issue number | 5 |
| DOIs | |
| State | Published - May 1998 |
| Externally published | Yes |