Aging resistance, mechanical properties and translucency of different yttria-stabilized zirconia ceramics for monolithic dental crown applications

Two kinds of powders of 3 mol. % yttria stabilized zirconia (3Y–TZP) with different particles sizes; one was 20 nm denoted by N whereas the other was 0.5 µm denoted by M, were mechanically mixed via ball milling machine using different amounts of N wt. % to obtain multiscale zirconia composite powder. Then the mixed powders were sintered by field assisted sintering technique (FAST). The effect of N content on the microstructure as well as on mechanical properties of zirconia is investigated. Results show that the microstructure of M completely surrounded by N emerged in zirconia composites, and tetragonal phase is presented in all the sintered samples. The obtained zirconia ceramics with 15 wt. % N own a highly dense structure (~ 99.9 % relative density) and high flexural strength of 813.59 MPa wherein a 15 % increase in flexural strength compared to zirconia ceramics without adding N, but the fracture toughness of the composites just lightly decreases. The improved flexural strength of the composites is caused by the multiscale effect.

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Investigating the effect of yttria contents on the structure and mechanical properties of zirconia ceramics

Science and Technology Development Journal ◽

10.32508/stdj.v19i4.685 ◽

2016 ◽

Vol 19 (4) ◽

pp. 232-240

Author(s):

Linh Ba Ngoc Nguyen ◽

Dung Van Hoang ◽

Van Thi Thanh Tran

Keyword(s):

Mechanical Properties ◽

Low Temperature ◽

Critical Concentration ◽

Annealing Process ◽

Yttria Stabilized Zirconia ◽

Precipitation Method ◽

Stabilized Zirconia ◽

Zirconia Ceramics ◽

Grain Sizes ◽

Co Precipitation

In this study, the co- precipitation method and annealing process were used to prepare the yttria stabilized zirconia ceramics. Data of Raman and XRD showed that an increase of yttria doping leads to an decrease of the ratio between monoclinic and tetragonal phases. Howerver, it existed a critical concentration of yttrium at which the highest value of hardness was about 14.5 GPa and grain sizes of 0.2–0.5 m. An investigation of low temperature degradation indicated that theaging process only occurred in the first 5 hours and then virtually negligible changes.

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Effects of He ion irradiation on the microstructures and mechanical properties of t' phase yttria-stabilized zirconia ceramics

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2018.08.259 ◽

2019 ◽

Vol 771 ◽

pp. 777-783 ◽

Cited By ~ 3

Author(s):

Guo Pu ◽

Jianxiong Zou ◽

Liwei Lin ◽

Kun Zhang ◽

Bo Liu ◽

...

Keyword(s):

Mechanical Properties ◽

Ion Irradiation ◽

Yttria Stabilized Zirconia ◽

Stabilized Zirconia ◽

Zirconia Ceramics ◽

Microstructures And Mechanical Properties ◽

T Phase

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Microstructural examination of modified yttria stabilized zirconia by EM analytical techniques

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100145558 ◽

1986 ◽

Vol 44 ◽

pp. 842-843

Author(s):

W. W. Davison ◽

R. C. Buchanan

Keyword(s):

Mechanical Properties ◽

Analytical Techniques ◽

Yttria Stabilized Zirconia ◽

Stabilized Zirconia ◽

Transmission Microscopy ◽

Sintering Aid ◽

Densification Temperature ◽

Chemical Inertness ◽

Scanning Transmission ◽

Microstructural Examination

Yttria stabilized zirconia (YSZ) has become a significant technological material due to its high ionic conductivity, chemical inertness, and good mechanical properties. Temperatures on the order of 1700°C are required, however, to densify YSZ to the degree necessary for good electrical and mechanical properties. A technique for lowering the densification temperature is the addition of small amounts of material which facilitate the formation of a liquid phase at comparatively low temperatures. In this study, sintered microstructures obtained from the use of Al2O3 as a sintering aid were examined with scanning, transmission, and scanning transmission microscopy (SEM, TEM, and STEM).

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Mechanical properties and phase-transformation behavior of carbon nanotube-reinforced yttria-stabilized zirconia composites

Ceramics International ◽

10.1016/j.ceramint.2021.09.071 ◽

2021 ◽

Author(s):

Byung-Koog Jang ◽

Ji-Hwoan Lee ◽

Craig A.J. Fisher

Keyword(s):

Mechanical Properties ◽

Phase Transformation ◽

Carbon Nanotube ◽

Yttria Stabilized Zirconia ◽

Transformation Behavior ◽

Stabilized Zirconia ◽

Phase Transformation Behavior ◽

Zirconia Composites

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Effect of Coupled Conditions of Thermal Cycle and Dump Environment on Conductivity of 5mol% Yttria Stabilized Zirconia

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.591.245 ◽

2013 ◽

Vol 591 ◽

pp. 245-248 ◽

Cited By ~ 1

Author(s):

Jin Feng Xia ◽

Hong Qiang Nian ◽

Tao Feng ◽

Hai Fang Xu ◽

Dan Yu Jiang

Keyword(s):

Electron Microscopy ◽

Mechanical Properties ◽

Transmission Electron Microscopy ◽

High Temperature ◽

Thermal Cycle ◽

Oxygen Sensor ◽

Yttria Stabilized Zirconia ◽

Cyclic Change ◽

Stabilized Zirconia ◽

Transmission Electron

In some applications such as automotive oxygen sensor, 5mol% Y2O3stabilized zirconia (5YSZ) is generally used because it has both excellent ionic conductivity and mechanical properties. The automotive oxygen sensor would experience a cyclic change from high temperature (engine running) environment to the low temperature damp environment (in the tail pipe when vehicle stops). The conductivity change with coupled conditions of thermal cycle and dump environment in the 5mol%Y2O3ZrO2(5YSZ) system was examined by XRD,Impedance spectroscopy and transmission electron microscopy (SEM) in this paper.

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