Microstructures, Properties and In Situ Toughening of Rapidly Solidified Al2O3/YSZ Composite Ceramics Prepared by Combustion Synthesis
The large-scale Al2O3/YSZ ceramic plates were prepared by combustion synthesis under high gravity, the ceramics were mainly composed of random-oriented rod-shaped grains, and within the rod-shaped grain aligned nano-submicron YSZ fibers were embedded. Compared to the high-performance directionally solidified ceramics, the hardness, flexural strength and fracture toughness of the eutectic ceramics obtained in the experiment increased by 40.7~55.1%, 9.6~26.0% and 172.0~240.0%, respectively. The increase in hardness and strength of the ceramics could be attributed to nano-submicron YSZ fibers and inter-phase spacing and the refinement of the eutectic grains; meanwhile, high-energy, large-angle boundaries between rod-shaped grains could introduce strong toughening mechanisms involving crack-bridging and pull-out of rod-shaped eutectics.
Wei Pan and Jianghong Gong
Z. M. Zhao et al., "Microstructures, Properties and In Situ Toughening of Rapidly Solidified Al2O3/YSZ Composite Ceramics Prepared by Combustion Synthesis", Key Engineering Materials, Vols. 368-372, pp. 771-774, 2008