Mechanical properties of Ce-TZP/Al2O3 ceramic composites as a function of sintering parameters

• Published in: Cerâmica 2024-04, Vol.68 (392), p.305-311
• Main Authors: Freitas, B X, Duarte, E T, Vasconcelos, J E A, Magnago, R O, Strecker, K, Santos, C
• Format: Magazinearticle
• Language: eng ; por
• Subjects: Aluminum oxide; Ce-TZP/Al2O3/H6A composites; Cerium oxides; Composite materials; Densification; Fracture toughness; Grain growth; Grain size; Grain size distribution; Heat treatment; MATERIALS SCIENCE, CERAMICS; Mechanical properties; Modulus of elasticity; Nanohardness; Sintering (powder metallurgy); Specific gravity; Tetragonal zirconia polycrystals; Zirconium dioxide
• ISSN: 0366-6913; 1678-4553; 1678-4553
• DOI: 10.1590/0366-69132024703923518

Ceramic composites based on Ce-TZP/Al2O3/H6A were sintered in order to promote grain growth and to study the effects of ZrO2 grain size on the properties of this material. A mixture of ZrO2-CeO2-Al2O3 powders was sintered at 1450 °C-2 h, following the manufacturer's recommendations. Then, the samples were further treated at 1500 or 1600 °C, for 0, 2, 8, or 24 h. The sintered specimens were characterized by X-ray diffraction, relative density, and grain size distribution. Vickers nanohardness, Young's modulus (E), and fracture toughness were measured. The materials showed complete densification for all sintering conditions studied. t-ZrO2, α-Al2O3, and cerium hexaluminate (H6A) were observed. The alumina and hexaluminate grains had average grain sizes of 0.7 and 4.5 μm (AR>3), respectively, without significant variations during the additional heat treatments. However, significant growth took place for the ZrO2 grains with increasing temperature and holding time, increasing the average grain size from 0.6~1.4 μm, when sintered at 1500 °C-2 h to 1600 °C-24 h, respectively. The materials exhibited Vickers nanohardness of 1800 HV and E=241±15 GPa. On the other hand, the considerable grain growth of the ZrO2 grains as a function of holding time reflected in a reduction of the fracture toughness, which decreased from 8.5 to 5.7 MPa.m1/2 for samples sintered at 1500 °C-2 h to 1600 °C-24 h, respectively.