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Mechanical properties of Ce-TZP/Al2O3 ceramic composites as a function of sintering parameters
- Source :
- Cerâmica, Vol 69, Iss 392, Pp 305-311 (2024)
- Publication Year :
- 2024
- Publisher :
- Associação Brasileira de Cerâmica, 2024.
-
Abstract
- Abstract 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.
Details
- Language :
- English, Portuguese
- ISSN :
- 16784553 and 03666913
- Volume :
- 69
- Issue :
- 392
- Database :
- Directory of Open Access Journals
- Journal :
- Cerâmica
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.7a4572403da44d3c8025364c747ed73d
- Document Type :
- article
- Full Text :
- https://doi.org/10.1590/0366-69132024703923518