| High-performance Al2O3 Composite Ceramics Modified
with Short Rod-Shaped ZrO2 Particles |
Yihang Fang,a Xianrui Zhao,b Lingqin Xia,a Guang Chen,a Tao Wu,a Ruiquan Wanga and
Mengxian Zhangc,*
Pages : 246-255
DOI : 10.1080/0371750X.2023.2231035 |
| Abstract |
| In this study, short rod-shaped monoclinic ZrO2 particles were synthesized
from Zr(NO3)4.5H2O, Y(NO3)3 and KOH in a hydrothermal reaction. The reaction
conditions, structure of the synthetic ZrO2 and effects of different concentrations
of ZrO2 on the mechanical properties of Al2O3 composite ceramics were investigated.
Dense monoclinic rod-shaped ZrO2 particles with rough surfaces were obtained
when the hydrothermal reaction temperature was 180oC, the reaction time was
24 h and the KOH concentration was 6 mol/L. Results from energy-dispersive X-ray
spectroscopy (EDS) and X-ray diffraction spectroscopy (XRD) confirmed the structure
and composition of the reaction product. Composite ceramics were prepared by hot
press sintering the synthetic ZrO2 with Al2O3, and optimal values of mechanical
properties were obtained for 7.5 wt% zirconia. The ZrO2 strengthened the Al2O3
composite ceramics by mechanisms that included reinforcement by fine grains,
enhancement by rod-shaped ZrO2 particles and phase transformation toughening.
[Keywords: Short rod-shaped ZrO2, Hydrothermal synthesis, Al2O3 composite ceramics,
Mechanical properties, Strengthening mechanism] |
| Full text : Subscribe to Download Full Text |
| [Go Back] |
|
