Effect of microwave sintering on the properties of copper oxide doped Y-TZP ceramics |
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| Authors: | S. Ramesh K.Y. Sara Lee C.Y. Tan Y.H. Wong U. Johnson Alengaram F. Tarlochan S. Ramesh W.D. Teng U. Sutharsini Ahmed A.D. Sarhan |
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| Affiliation: | 1. Center of Advanced Manufacturing and Material Processing, Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;2. Department of Mechanical Engineering, Faculty of Engineering and Technology, Tunku Abdul Rahman University College, 53300 Kuala Lumpur, Malaysia;3. Centre for Innovative Construction Technology (CICT), Department of Civil Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;4. Mechanical and Industrial Engineering Department, College of Engineering, Qatar University, Doha, Qatar;5. Centre for Ionics University of Malaya, Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia;6. Ceramics Technology Group, SIRIM Berhad, Shah Alam 40911, Malaysia;g. Department of Physics, University of Jaffna, Jaffna, JA 40000, Sri Lanka;h. Mechanical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia |
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| Abstract: | The effect of various amounts of copper oxide (CuO) up to 1?wt% on the densification behaviour and mechanical properties of 3?mol% yttria-tetragonal zirconia polycrystal (Y-TZP) were studied by using microwave (MW) sintering method. The MW sintering was performed at temperatures between 1100?°C and 1400?°C, with a heating rate of 30?°C/min. and holding time of 5?min. The beneficial effect of MW in enhancing densification was also compared for the undoped and 0.2?wt% CuO-doped Y-TZP when subjected to conventional sintering (CS) method. The results showed that significant enhancement in the relative density and Vickers hardness were observed for the undoped Y-TZP when MW-sintered between 1100?°C and 1250?°C. It was revealed that the 0.2?wt% CuO-doped Y-TZP and MW sintered at 1250–1300?°C could attain ≥?99.8% of theoretical density, Vickers hardness of about 14.4?GPa, fracture toughness of 7.8 MPam1/2 and exhibited fine equiaxed tetragonal grain size of below 0.25?µm. In contrast, the addition of 1?wt% CuO was detrimental and the samples exhibited about 50% monoclinic phase upon sintering coupled with poor bulk density and mechanical properties. The study also revealed that the addition of 0.2?wt% CuO and subjected to conventional sintering produced similar densification as that obtained for microwave sintering, thus indicating that the dopant played a more significant role than the sintering method. |
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| Keywords: | Copper oxide Sintering additive Y-TZP Microwave sintering Mechanical properties |
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