scholarly journals EFFECT OF AGING ON THE FLEXURAL STRENGTH OF TRANSLUCENT MONOLITHIC YTTRIA STABILIZED ZIRCONIA

2018 ◽  
Vol 64 (2) ◽  
pp. 1539-1546
Author(s):  
Maha Abd El Moaty ◽  
Mohamed Mohey Eldien
Keyword(s):  
Flexural Strength ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia

Roughness and its effects on flexural strength of dental yttria-stabilized zirconia ceramics

2019 ◽  
Vol 739 ◽  
pp. 149-157 ◽  
Author(s):  
José Eduardo Vasconcellos Amarante ◽  
Marcos Venícius Soares Pereira ◽  
Grace Mendonça de Souza ◽  
Manuel Fellipe R. Pais Alves ◽  
Bruno Galvão Simba ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Zirconia Ceramics

Microstructure and Mechanical Properties of Multiscale Zirconia Ceramics Prepared by Field Assisted Sintering Technique

2016 ◽  
Vol 697 ◽  
pp. 354-359
Author(s):  
Khalid Eltayeb ◽  
Dong Qin Jin ◽  
Young Hwan Han ◽  
Fei Chen ◽  
Qiang Shen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Yttria Stabilized Zirconia ◽  
Milling Machine ◽  
Stabilized Zirconia ◽  
Zirconia Ceramics ◽  
Dense Structure ◽  
Zirconia Composites ◽  
20 Nm ◽  
Field Assisted Sintering

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.

Thermal Cycling Effect on Mechanical Properties of Yttria-Stabilized Tetragonal Zirconia

2013 ◽  
Vol 538 ◽  
pp. 121-124
Author(s):  
Jing Zhang
Keyword(s):  
Mechanical Properties ◽  
Phase Transition ◽  
Thermal Expansion ◽  
Flexural Strength ◽  
Thermal Cycling ◽  
Tetragonal Zirconia ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Optical Applications ◽  
The Stability

Yttria-stabilized zirconia (YSZ) is an important material in the area of energy and optical applications. In this study, the mechanical properties (Young’s modulus, Vickers hardness, flexural strength, and coefficient thermal expansion) and physical properties (phase transition) of yttria-stabilized tetragonal zirconia polycrystalline (Y-TZP) was reported. The effect of thermal cycling on the mechanical properties and the stability was also evaluated.

Effect of metal chloride solutions on coloration and biaxial flexural strength of yttria-stabilized zirconia

2012 ◽  
Vol 18 (5) ◽  
pp. 805-812 ◽  
Author(s):  
Gye-Jeong Oh ◽  
Kwangmin Lee ◽  
Doh-Jae Lee ◽  
Hyun-Pil Lim ◽  
Kwi-Dug Yun ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Metal Chloride ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Chloride Solutions ◽  
Biaxial Flexural Strength

The Effect of Sintering Temperature on the Physical Properties and Bending Strength of Zirconia Toughened Ceramic

2012 ◽  
Vol 519 ◽  
pp. 273-276
Author(s):  
Ze Quan Hua ◽  
Bin Zhang ◽  
Ji Hua Chen ◽  
Lian Jun Sun ◽  
Ying Zhang
Keyword(s):  
Flexural Strength ◽  
Physical Properties ◽  
Bending Strength ◽  
Sintering Temperature ◽  
Yttria Stabilized Zirconia ◽  
Surface Porosity ◽  
Stabilized Zirconia ◽  
Three Point Bending ◽  
Temperature Range ◽  
Press Method

This research investigated the effect of sintering temperature on the physical properties and bending strength of zirconia toughened ceramic (ZTC). 3mol% yttria-stabilized zirconia compacts were prepared by dry press method and then sintered with different final sintering temperature: 1490°C, 1530°C, 1570°C and 1610°C respectively. The physical properties and three-point bending strength were measured. The results of the test indicated that the density and shrinkage of ZTC increased along with the rise of sintering temperature, while the surface porosity of the samples decreased. The curve of flexural strength is indicated the variolation tendency of falling after rising, being the maximum at 1570°C. The results of this experiment showed that the best sintering temperature of yttria-stabilized zirconia was showed at 1570°C in terms of physical properties and bending strength among the selected temperature range.

Analysis of Flexural Strength of Ceramics Based on Zirconia Stabilized by Yttria with Ceramic Cover

2015 ◽  
Vol 820 ◽  
pp. 325-329
Author(s):  
C.F. Carvalho ◽  
C.L. Melo-Silva ◽  
T.C.F. Melo-Silva ◽  
R.X. Freitas ◽  
J.P.S. Sudré ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Yttria Stabilized Zirconia ◽  
Control Group ◽  
Stabilized Zirconia ◽  
Dental Prostheses ◽  
Different Types

The aim of this study was to analyze the flexural strength of ceramics based on yttria-stabilized zirconia ( Y-TZP) , used in the manufacture of dental prostheses infrastructure with different types of coating ceramics. The rectangular samples measuring 18mm x 4mm x 1.2 mm were divided into groups (n = 10): G1 = control Y-TZP, G2= Y-TZP + sintered feldspathic ceramic and G3= Y-TZP + pressable feldspathic ceramic and submitted to assay of three points with a speed of 0.5 mm / min. Compared to the control group (G1), the group that showed the greatest resistance to bending was the G2, however, not significant relative to G3. No group provided the infrastructure fracture. It was observed by means of the methodology applied to all groups are suitable for use in dental prostheses.

Microstructural examination of modified yttria stabilized zirconia by EM analytical techniques

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).

Characterizations of Synthetic 8mol% YSZ with Comparison to 3mol %YSZ for HT-SOFC

2020 ◽  
Vol 38 (4A) ◽  
pp. 491-500
Author(s):  
Abeer F. Al-Attar ◽  
Saad B. H. Farid ◽  
Fadhil A. Hashim
Keyword(s):  
Ionic Conductivity ◽  
Electrochemical Impedance ◽  
Structural Information ◽  
Impedance Analysis ◽  
High Energy ◽  
Yttria Stabilized Zirconia ◽  
X Ray Diffraction ◽  
Stabilized Zirconia ◽  
Powder Morphology ◽  
X Ray

In this work, Yttria (Y2O3) was successfully doped into tetragonal 3mol% yttria stabilized Zirconia (3YSZ) by high energy-mechanical milling to synthesize 8mol% yttria stabilized Zirconia (8YSZ) used as an electrolyte for high temperature solid oxide fuel cells (HT-SOFC). This work aims to evaluate the densification and ionic conductivity of the sintered electrolytes at 1650°C. The bulk density was measured according to ASTM C373-17. The powder morphology and the microstructure of the sintered electrolytes were analyzed via Field Emission Scanning Electron Microscopy (FESEM). The chemical analysis was obtained with Energy-dispersive X-ray spectroscopy (EDS). Also, X-ray diffraction (XRD) was used to obtain structural information of the starting materials and the sintered electrolytes. The ionic conductivity was obtained through electrochemical impedance spectroscopy (EIS) in the air as a function of temperatures at a frequency range of 100(mHz)-100(kHz). It is found that the 3YSZ has a higher density than the 8YSZ. The impedance analysis showed that the ionic conductivity of the prepared 8YSZ at 800°C is0.906 (S.cm) and it was 0.214(S.cm) of the 3YSZ. Besides, 8YSZ has a lower activation energy 0.774(eV) than that of the 3YSZ 0.901(eV). Thus, the prepared 8YSZ can be nominated as an electrolyte for the HT-SOFC.

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