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Improved Microstructure and Hardness Properties of Low-Temperature Microwave-Sintered Y 2O 3 Stabilized ZrO 2 Ceramics with Additions of Nano TiO 2 Powders

Authors
  • Weng, Min-Hang
  • Lin, Cheng-Xun1
  • Huang, Cian-Song
  • Tsai, Chin-Yi1
  • Yang, Ru-Yuan1
  • 1 (C.-Y.T.)
Type
Published Article
Journal
Materials
Publisher
MDPI AG
Publication Date
Mar 27, 2020
Volume
13
Issue
7
Identifiers
DOI: 10.3390/ma13071546
PMID: 32230850
PMCID: PMC7177508
Source
PubMed Central
Keywords
License
Green

Abstract

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.

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