Abstract
Cellular submicrocrystal Al2O3/TZP powders (CSP) were successfully prepared by Al-Al(NO3)3 combustion synthesis assisted rapid atomization and water cooling (CS-RAWC). CSP mainly contains intracellular metastable Al2O3 phase with the grain size of ∼ 250 nm and intercellular t-ZrO2 supersaturated solid solution (SS) phase with the thickness of ∼ 30 nm. The t-ZrO2(SS) phases are t-Zr1-x-yAlxCeyO2-x/2 and t-Zr1-x-yAlxYyO2-x/2-y/2, due to phase transition stabilizers of CeO2, Y2O3 and Al2O3. There are also some t-ZrO2(SS) phases in the small-sized cellular submicro-Al2O3 crystals. After CSP heat-treated at 1450 °C for 1 h, it still retains cellular microstructure. Meanwhile, high-density nano- and supra-nano-ZrO2 particles by in-situ nanoprecipitation are evenly distributed in intercellular ZrO2 and intracellular Al2O3 grains. The special microstructures of the CSP before and after heat-treatment are difficult to be realized by previous methods. Therefore, the CSP approach has played an important guiding role in the preparation of cellular crystal powders and nanocomposite ceramics.
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