التفاصيل البيبلوغرافية
| العنوان: |
Mechanical properties of Ce-TZP/Al2O3 ceramic composites as a function of sintering parameters. |
| المؤلفون: |
Freitas, B. X., Duarte, E. T., Vasconcelos, J. E. A., Magnago, R. O., Strecker, K., Santos, C. |
| المصدر: |
Ceramica; Oct-Dec2023, Vol. 69 Issue 392, p305-311, 7p |
| مصطلحات موضوعية: |
HEAT treatment, PARTICLE size distribution, YOUNG'S modulus, FRACTURE toughness, SPECIFIC gravity, HARDNESS, CERAMICS |
| مستخلص: |
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. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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