Microstructural evolution and mechanical properties of nano-ATZ ceramics by solid solution precipitation

Journal of Materials Research and Technology

Xiaodong He¹  Yongting Zheng²  Yuchen Yuan²  Xudong Liu²  Yongdong Yu²  Zhao Yin²  Hang Yin²  Wanjun Yu³ 

[1] Corresponding author.;National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin, 150080, PR China;School of Environment and Materials Engineering, Yantai University, Yantai, 264003, PR China;

关键词: Combustion synthesis;    Rapid solidification;    Microstructural evolution;    Nano-ATZ;    Solid solutions;    Nanoprecipitation;   

DOI  :  

来源: DOAJ

【 摘 要 】

Alumina toughened zirconia (ATZ) nanoceramics accompanied with high-strength, high-toughness and high-hardness were prepared by in-situ nanoprecipitation from using solid solution micro-powders. The submicron-sized Al2O3 (∼445 nm) and ZrO2 (∼361 nm) grains contained low-density precipitated nano-ZrO2 (∼35 nm) and nano-Y4Al2O9 (YAM, ∼87 nm) particles, respectively, making high-performance nano-ATZ ceramics with ultrafine intracrystalline nanostructure yet achieved. There was a parallel or eutectic lattice orientation relationship between the submicrocrystals and its internal nanoparticles of their crystal planes, which is very conducive to the improvement of the mechanical properties of nano-ATZ ceramics. The fracture toughness and hardness of 30wt%Al2O3/70wt%ZrO2(3 mol%Y2O3) can reach up to 5.68 ± 0.17 MPa m1/2 (single-edge V-notched beam method, SEVNB) and 16.32 ± 0.45 GPa, respectively, which are improved by ∼25% and ∼20% compared with those of 3Y-TZP ceramics. Therefore, this method can be used to prepare nano-ATZ ceramics contained ultrafine nanoparticles and uniform distribution of Al2O3 phases.

【 授权许可】

Unknown