| Effects of sintering temperature and zirconia content on the mechanical and microstructural properties of MgO, TiO2 and CeO2 doped alumina–zirconia (ZTA) ceramic |
| Md. Al-Amin1,2, Homayra Tabassum Mumu3, Saugata Sarker3, Md. Zahangir Alam2, M. A. Gafur1 |
1Pilot Plant and Process Development Centre, Bangladesh Council of Scientific and Industrial Research, Dhaka 1205, Bangladesh
2Department of Applied Chemistry and Chemical Engineering, University of Dhaka, Dhaka 1000, Bangladesh
3Department of Materials and Metallurgical Engineering, Bangladesh University of Engineering and Technology, Dhaka 1000, Bangladesh |
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Received: October 16, 2021; Revised: January 15, 2022 Accepted: February 12, 2022. Published online: March 9, 2022. |
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| ABSTRACT |
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The effects of sintering temperature and ZrO2 addition on the hardness and fracture toughness of zirconia toughened alumina (ZTA)–MgO–TiO2 composite was investigated. 5 wt.% CeO2 was added to ZTA containing 5 wt.% of MgO and 5 wt.% of TiO2. Two sets of composition A5ZMTC and A15ZMTC were used consisting of 5 wt.% and 15 wt.% of 3YSZ, respectively, to analyze the effect of CeO2 on the base composition. The powders were pressed into pellets and sintered at different temperatures of 1450 °C, 1500 °C, 1600 °C and 1650 °C for 3 h. Density, hardness and fracture toughness increased to a maximum value and then decreased. From the XRD analysis, Ce0.7Zr0.3O2 in only A5ZMTC and CeAl 11O18 in only A15ZMTC are evident. The highest fracture toughness of 12.03 MPam1/2 (Casellas) was achieved at 1500 °C in A15ZMTC and maximum hardness of 14.15 GPa was obtained in A5ZMTC sintered at 1450 °C. |
| Key words:
Zirconia toughened alumina (ZTA) · Advanced ceramics · Fracture toughness · Load-bearing ceramics · Inclusion |
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