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

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,...

Full description

Saved in:
Bibliographic Details
Published in:Materials 2020-03, Vol.13 (7), p.1546
Main Authors: Weng, Min-Hang, Lin, Cheng-Xun, Huang, Cian-Song, Tsai, Chin-Yi, Yang, Ru-Yuan
Format: Article
Language:English
Subjects:
Acids
Ceramic powders
Ceramics
Citric acid
Cooling
Corrosion
Crack propagation
Densification
Diamond pyramid hardness
Energy
Grain boundaries
Grain growth
Grain size
Heat
Low temperature
Mechanical properties
Microstructure
Polyvinyl alcohol
Scanning electron microscopy
Sintering
Sintering (powder metallurgy)
Tetragonal zirconia
Tetragonal zirconia polycrystals
Titanium
Titanium dioxide
Yttria-stabilized zirconia
Yttrium oxide
Zirconium dioxide
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma13071546