Effect of heating rate and sintering temperature on mechanical properties of zirconia partially toughened alumina | ||
| Journal of Engineering Science and Military Technologies | ||
| Articles in Press, Accepted Manuscript, Available Online from 05 October 2025 | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejmtc.2025.415656.1333 | ||
| Authors | ||
| Ehab Mohamed Abdelbary* 1; Tarek Mohamed Abd Elbadia2; Mohamed Awaad3; Salma Mohamed Naga4 | ||
| 1Technical research center | ||
| 2Misr University for Science and Technology, Faculty of engineering, Mechatronics department, Cairo, Egypt | ||
| 3National Research Center | ||
| 4National Research Centre | ||
| Abstract | ||
| Zirconia toughened alumina (ZTA) is considered one of the most promising ceramic materials due to its superior properties. It possesses high flexural strength, high hardness and good fracture toughness. Tetragonal zirconia partially stabilized with 3% yttria was added in percentages of 10, 15, 20 and 25% to granulated alumina powder. The granulated powder enhanced physical properties of green samples and final mechanical properties. The samples were manufactured from as-received powders by mechanical mixing, then isostatically pressed at 300 MPa. The formed samples were sintered at 1650 °C with a soaking time of 1h at the top temperature. The samples that contain 15% yttria partially stabilized zirconia showed the best mechanical properties. Accordingly, the 15% yttria partially samples were chosen for the study completion. They were sintered at two sintering temperatures, 1550 and 1650 °C, with two different heating rates, 5 and 10 degrees per minute. The apparent porosity, bulk density, flexural strength and fracture toughness were measured to evaluate the most suitable sintering temperature and heating rate. Samples containing 15% partially stabilized zirconia sintered at 1650 °C with a heating rate of 10 °C/minute had the optimal properties. They displayed the maximum flexural strength of 318 MPa due to its small grain size, low porosity and maintaining zirconia in the tetragonal phase. | ||
| Keywords | ||
| Ceramic; ZTA; Sintering parameters; Mechanical properties | ||
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