Effect of microwave sintering on the properties of copper oxide doped Y-TZP ceramics

Ramesh, Singh and Sara Lee, K.Y. and Tan, Chou Yong and Wong, Yew Hoong and Alengaram, Ubagaram Johnson and Tarlochan, Faris and Ramesh, Subramaniam and Teng, W.D. and Sutharsini, U. and Sarhan, Ahmed Aly Diaa Mohammed (2018) Effect of microwave sintering on the properties of copper oxide doped Y-TZP ceramics. Ceramics International, 44 (16). pp. 19639-19645. ISSN 0272-8842

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Official URL: https://doi.org/10.1016/j.ceramint.2018.07.215

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.

Item Type: Article
Uncontrolled Keywords: Copper oxide; Sintering additive; Y-TZP; Microwave sintering; Mechanical properties
Subjects: Q Science > QC Physics
T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering
Faculty of Science > Dept of Physics
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 16 Apr 2019 07:43
Last Modified: 16 Apr 2019 07:43
URI: http://eprints.um.edu.my/id/eprint/20930

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