High-density nanoprecipitation mechanism and microstructure evolution of high-performance Al2O3/ZrO2 nanocomposite ceramics. Issue 10 (August 2021)

• Record Type: Journal Article
• Authors: Yu, Yongdong; Lin, Fengyu; Zheng, Yongting; Yu, Wanjun; Liu, Xudong; Yuan, YuChen; Yin, Hang; He, Xiaodong
• Is Part Of: Journal of the European Ceramic Society. Volume 41:Issue 10(2021)
• Page Start: 5269
• Page End: 5279
• Publication Date: 2021-08
• Subjects: Al2O3/ZrO2 -- Nanoprecipitation -- Nanocomposite ceramics -- Microstructure evolution -- Solid solutions; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2021.04.034
• Languages: English
• ISSNs: 0955-2219

Abstract

Highlights: Supersaturated Al2 O3 /ZrO2 solid solution powders are prepared by combustion synthesis assisted water atomization. Supersaturated solid solutions can prepare high-performance Al2 O3 /ZrO2 ceramics by high-density nanoprecipitation. The morphologies of the phase field simulation are consistent with the microstructure of Al2 O3 /ZrO2 nanoceramics. Submicro-crystals of Al2 O3 /ZrO2 nanoceramics contain nano- and supra-nano-particles. Abstract: Al2 O3 /ZrO2 supersaturated solid solution micro-powders (AZ-SSP) with three components were successfully obtained by combustion synthesis assisted rapid water cooling, and their nanoprecipitation mechanism and microstructure evolution were studied by phase field simulation and hot-press sintering. The results show that AZ-SSP could be used to fabricate Al2 O3 /ZrO2 nanocomposite ceramics (AZNC) with intragranular-intercrystalline microstructures by high-density nanoprecipitation, consistent with microstructures of heat-treated AZ-SSP via the phase field simulation. There were three simulated nanostructures of spherical and elongated particles in A57Z-SSP or A15Z-SSP and interlocking structures in A36Z-SSP. The submicro-crystals of A57ZNC and A15ZNC contain high-density nano- and supra-nano-particles, and the fracture toughness of these two ceramics can reach up to 10.37 ± 0.37 MPa·m 1/2 and 12.63 ± 0.36 MPa·m 1/2, respectively. Hence, the preparation method of ultra-fine structures by supersaturated solid solution has far-reaching guiding significance for various nanoceramics.