Microstructural evolution and mechanical properties of nano-ATZ ceramics by solid solution precipitation release_ghqi5j2fhnewnpurnz3ikdf2a4

Abstract

<jats:title>Abstract</jats:title> Alumina toughened zirconia (ATZ) nanoceramics with high-strength, high-toughness and high-hardness were prepared by in-situ nanoprecipitation from solid solution micro-powders. The submicron Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> (~ 450 nm) and ZrO<jats:sub>2</jats:sub> (~ 350 nm) grains contained low-density precipitated nano-ZrO<jats:sub>2</jats:sub> (~ 40 nm) and nano-Y<jats:sub>4</jats:sub>Al<jats:sub>2</jats:sub>O<jats:sub>9</jats:sub> (YAM, ~ 90 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%Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>/70wt%ZrO<jats:sub>2</jats:sub>(3mol%Y<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>) can be as high as 5.68 ± 0.17 MPa·m<jats:sup>1/2</jats:sup> (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 Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> phases.
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