Structure and Properties of Composite 6YSZ-Al2O3-HfO2 Ceramics Depending on the Sintering Mode
Abilev M. Yerbolat D. Skakov M. Zhilkashinova A. Pavlov A. Gert S. Zhambakin D. Kantay N. Zhilkashinova A.
June 2025Springer
Journal of Materials Engineering and Performance
2025#34Issue 1212247 - 12255 pp.
The article presents the main results on the development of technology for the synthesis of ceramics based on zirconium oxide. The influence of the temperature factor on the structure and physical and mechanical properties of ceramic materials synthesized from 6YSZ-Al2O3-HfO2 by semi-dry pressing followed by sintering in vacuum was established. The optimal mode of heat treatment of ceramic samples in vacuum was established to be 1600 °C. At this sintering temperature, the apparent density of the experimental sample was 5.8 g/cm3, which corresponds to 96% of the theoretical value, open porosity was 0.19%, water absorption was 0.07%, microhardness was 12.1 GPa, and crack resistance reached the value K1C = 6.0 MPa·m1/2. Sintering the 6YSZ-Al2O3-HfO2 system resulted in the transformation of the monoclinic lattice into tetragonal depending on the temperature. The monoclinic crystal structure of Al2O3 transformed into hexagonal. Y2O3 and HfO2 were represented by monoclinic phases and did not undergo phase transformations in the studied temperature range.
6YSZ-Al2O3-HfO2 ceramics , phase composition , phase transformations , sintering , zirconium dioxide
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Sarsen Amanzholov East Kazakhstan University, 34 Tridtsatoy Gvardeiskoy Divizii Str, Ust-Kamenogorsk, 070002, Kazakhstan
Al-Farabi Kazakh National University, 71 Al-Farabi ave, Almaty, 050040, Kazakhstan
Sarsen Amanzholov East Kazakhstan University
Al-Farabi Kazakh National University
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