Abstract
The YSZ/Al2O3 supersaturated solid solution micro-powders (YAP) were successfully obtained by combustion synthesis assisted rapid water cooling. They were composed of metastable t-ZrxAlyYmOz phase and metastable γ-Al2O3 phase with nano-scale microstructures. There was almost no change in the composition of YAP at the temperature ≤1200 K. The α-Al2O3 phase appeared in YAP after heat-treatment at 1300 K, and the average grain size of the solid solution was about 10 nm and 50 nm in YAP-1300 and YAP-1500, respectively. Because the submicro-grains on the surface of YAP-1700 by in-situ nanoprecipitation, the interfaces between YAP disappeared, making intracrystalline-intercrystalline nanocomposite ceramics yet achieved from YAP. Therefore, this method has a guiding role in the preparation of ceramics with high-density nanoprecipitation from YAP.
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