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Article

Improved Microstructure and Hardness Properties of Low-Temperature Microwave-Sintered Y2O3 Stabilized ZrO2 Ceramics with Additions of Nano TiO2 Powders

1
School of Information Engineering, Putian University, Putian 351100, Fujian, China
2
Graduate Institute of Materials Engineering, National Pingtung University of Science and Technology, Pingtung County 912, Taiwan
3
Department of Food Science, National Pingtung University of Science and Technology, Pingtung County 912, Taiwan
*
Author to whom correspondence should be addressed.
Materials 2020, 13(7), 1546; https://doi.org/10.3390/ma13071546
Received: 30 January 2020 / Revised: 17 March 2020 / Accepted: 24 March 2020 / Published: 27 March 2020
(This article belongs to the Special Issue Advanced Materials and Techniques for Dental Implant Treatment)
This paper reports the improvement of microstructural and hardness properties of 3 mol% yttria-stabilized zirconia (3Y-TZP) ceramics with nano TiO2 powders (with 0, 0.9, 1.8, and 2.7 wt%) added using a low-temperature microwave-assisted sintering of 1250 °C. Even at such a low sintering temperature, all sintered samples had the main phase of tetragonal zirconia (t-ZrO2) without the appearance of the secondary monoclinic phase or TiO2 phase, and had high relative densities, larger than 95%. The grain growth was well developed, and the grain sizes were around 300–600 nm. The Ti and O elements appeared at the grain and grain boundary and increased with the increased nano TiO2 contents identified by the element analysis, although the TiO2 phase did not appear in the X-ray pattern. The Vickers hardness was in the range of 10.5 to 14.5 GPa, which first increased with increasing content till 0.9 wt% and then decreased. With citric acid corrosion treatment for 10 h, the Vickers hardness only decreased from 14.34 GPa to 13.55 GPa with the addition of 0.9 wt% nano TiO2 powder. The experiment results showed that 0.9 wt% nano TiO2 addition can improve the densification as well as the Vickers hardness under a low temperature of microwave-assisted sintering. View Full-Text
Keywords: zirconia; microstructure; Vickers hardness; microwave sintering zirconia; microstructure; Vickers hardness; microwave sintering
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MDPI and ACS Style

Weng, M.-H.; Lin, C.-X.; Huang, C.-S.; Tsai, C.-Y.; Yang, R.-Y. Improved Microstructure and Hardness Properties of Low-Temperature Microwave-Sintered Y2O3 Stabilized ZrO2 Ceramics with Additions of Nano TiO2 Powders. Materials 2020, 13, 1546. https://doi.org/10.3390/ma13071546

AMA Style

Weng M-H, Lin C-X, Huang C-S, Tsai C-Y, Yang R-Y. Improved Microstructure and Hardness Properties of Low-Temperature Microwave-Sintered Y2O3 Stabilized ZrO2 Ceramics with Additions of Nano TiO2 Powders. Materials. 2020; 13(7):1546. https://doi.org/10.3390/ma13071546

Chicago/Turabian Style

Weng, Min-Hang, Cheng-Xun Lin, Cian-Song Huang, Chin-Yi Tsai, and Ru-Yuan Yang. 2020. "Improved Microstructure and Hardness Properties of Low-Temperature Microwave-Sintered Y2O3 Stabilized ZrO2 Ceramics with Additions of Nano TiO2 Powders" Materials 13, no. 7: 1546. https://doi.org/10.3390/ma13071546

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