Effect of colourants on the optical characteristics and structure of Y 2 O 3 stabilised tetragonal zirconia ceramic

2021 ◽  
Author(s):  
Jianfeng Chen ◽  
Ning Wen ◽  
Chundong Xue ◽  
Zhaocen Liu ◽  
Zhuoran Liang ◽  
...  
Keyword(s):  
Tetragonal Zirconia ◽  
Optical Characteristics ◽  
Zirconia Ceramic

Sintering Behavior of Tetragonal Zirconia Ceramic Stabilized with Yttria and Rare Earth Oxide (YRE) Mixtures

2003 ◽  
Vol 416-418 ◽  
pp. 609-615 ◽  
Author(s):  
Sergio Luiz Mineiro ◽  
Maria do Carmo de Andrade Nono ◽  
Carlos Kuranaga ◽  
M.L.B. Mattos
Keyword(s):  
Rare Earth ◽  
Tetragonal Zirconia ◽  
Rare Earth Oxide ◽  
Zirconia Ceramic ◽  
Sintering Behavior

Tribological Property Investigation of Self-Lubricating Molybdenum-Based Zirconia Ceramic Composite Operational at Elevated Temperature

2019 ◽  
Vol 142 (2) ◽  
Author(s):  
Kunal Ghosh ◽  
Subhrojyoti Mazumder ◽  
Bipin Kumar Singh ◽  
Harish Hirani ◽  
Poulomi Roy ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Wear Rate ◽  
Photoelectron Spectroscopy ◽  
Ceramic Composite ◽  
Wear Behavior ◽  
Substantial Reduction ◽  
Tetragonal Zirconia ◽  
Zirconia Ceramic ◽  
Sintering Process ◽  
Wear Debris Analysis

Abstract Three mol% yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP) with 0.5 wt% of magnesium oxide (MgO) and 6 wt% of molybdenum (Mo) were prepared by the pressureless sintering process, and the friction and wear behavior of the ceramic composite were studied against the alumina disc. Tribological tests were carried out both at room temperature as well as at an elevated temperature (500 °C). The result revealed that a substantial reduction of ∼50% in the friction coefficient and ∼31% reduction in the wear rate were achieved while 6 wt% Mo was added into the 3Y-TZP matrix operational at 500 °C. No significant tribological influence was observed with the addition of Mo at the normal operating temperature. The minimum coefficient of friction and low specific wear rate were achieved because of the formation of MoO3 in between the mating surfaces at elevated temperature. The worn surfaces were characterized by means of field emission scanning electron microscopy (FESEM). The formation of MoO3 phases was identified by wear debris analysis which was performed with the help of X-ray photoelectron spectroscopy (XPS).

scholarly journals Effect of cleaning agent, primer application and their combination on the bond strength of a resin cement to two yttrium-tetragonal zirconia polycrystal zirconia ceramics

2017 ◽  
Vol 11 (01) ◽  
pp. 006-011 ◽  
Author(s):  
William Matthew Negreiros ◽  
Glaucia Maria Bovi Ambrosano ◽  
Marcelo Giannini
Keyword(s):  
Bond Strength ◽  
Water Storage ◽  
Tetragonal Zirconia ◽  
Resin Cement ◽  
Zirconia Ceramic ◽  
Coupling Agents ◽  
Zirconia Ceramics ◽  
Cleaning Agent ◽  
Failure Data ◽  
Significant Difference

ABSTRACT Objective: The objective of this study is to evaluate the effect of a cleaning agent and priming on the bond strength (BS) of a resin cement (RC) to zirconia ceramics after 24 h and 1 year of water-storage. Materials and Methods: Fifty-six Katana and 56 ZirCAD zirconia ceramic plates were prepared and each zirconia brand was divided into four groups (n = 14): (1) untreated; (2) treated with Ivoclean cleaning agent; (3) treated with Monobond Plus coupling agent; (4) treated with Ivoclean + Monobond Plus. Cleaning and coupling agents were applied to zirconia following the manufacturers' instructions. The RC was manipulated, inserted into tubes (0.75 mm diameter/1 mm height) that were positioned on the zirconia surfaces and light activated. Specimens were tested after 24 h and 1 year of water storage. A shear load was applied to the base of the RC cylinders (until failure. Data were analyzed by three-way ANOVA and Tukey tests (α = 5%). Results: No significant difference in BS was noted between zirconia ceramics, except when the combination of cleaning and coupling agents was used. This combination increased the BS for Katana zirconia. One year of water storage leads to a decrease in BS for all experimental groups. Conclusion: The combination of cleaning agent and priming can yield higher BS for Katana at 24 h. BS to zirconia ceramics reduced approximately 50% after 1 year.

Effect of Two Kinds of Rare Earth Oxides on Zirconia Restoration

2013 ◽  
Vol 591 ◽  
pp. 113-116
Author(s):  
Jian Feng Chen ◽  
Rui Jie Dang ◽  
Li Sheng Zhao ◽  
Bin Deng ◽  
Bin Gu ◽  
...  
Keyword(s):  
Rare Earth ◽  
Color Change ◽  
Tetragonal Zirconia ◽  
Rare Earth Oxides ◽  
Zirconia Ceramic ◽  
Green Color ◽  
Cerium Oxides ◽  
Cold Isostatic Pressure

Objective: To evaluate the colouration of zirconia ceramic by adding two kinds of rare earth oxides. Methods: Added different concentrations of Fe2O3and CeO2in tetragonal zirconia poly crystals stabilized with 3Y-TZP powder compacted at 200MPa using cold isostatic pressure, and fully sinter. The chromaticity of sintered bodies was measured with spectrophotometer. Results: self-colored zirconia by two kinds of rare earth oxides: The lightness of zirconia by adding cerium oxides was about 85 and a* decreased slightly. The color shifted to more yellow-green color. The chroma of the ceramics became more intensity, the lightness decreased with the increasing of the content of ferrum oxides and the color change to red-yellow direction. Conclusion: Zirconia ceramic could be colorized by Fe2O3and CeO2.

Surface Properties of Dental 3Y-TZP with Different Treatments

2014 ◽  
Vol 633 ◽  
pp. 352-356
Author(s):  
Yi Hong Liu ◽  
Yong Wang
Keyword(s):  
Computer Aided Design ◽  
Tetragonal Zirconia ◽  
Optical Microscope ◽  
Milling Process ◽  
Machining Process ◽  
Uniaxial Pressure ◽  
Zirconia Ceramic ◽  
Full Density ◽  
Green Body ◽  
Dental Restorations

The purpose of this study was to study the surface characteristics of the dental 3Y-TZP (3 mol% yttria stabilized tetragonal zirconia) ceramic treated by machining process and analysis what impact on the mechanical properties of the 3Y-TZP dental restorations. Dense core ceramic discs were made of 3Y-TZP. The samples were partially sintered to get part strength after uniaxial pressure moulding. The partially sintering green body could be treated by grinding, incising and milling and incising to simulate the CAD-CAM (computer aided design/computer aidedmanufacturing) process in dentistry. The partially sintering samples were then sintered to achieve full density. The dense sintered ceramics were also treated by grinding and incising to simulate the dental restorations adjusting process in dental clinic. The both surface of thespecimens were studied with an optical microscope and field emission SEM. Bulges were observed on the surface of the sample after uniaxial pressure moulding process. The defects due to partially sintered green body milling process were different from incising process in size and shape. Groves are observed on the surfaces of the samples after grinding process. The conclusions were that (i) machining of the final sintered dental 3Y-TZP ceramic brought more critical damage than the machining of partly-sintered green-bodies; (ii) the milling process ofthe partially sintered green-body brought less damage to the 3Y-TZP samples than the incising process.

Thermal Conductivity of Porous Alumina-Zirconia Prepared by Foam Technique for Applications in Cooling Systems of Artificial Satellites

2010 ◽  
Vol 636-637 ◽  
pp. 161-167 ◽  
Author(s):  
Ana Coh O. Hirschmann ◽  
Maria do Carmo de Andrade Nono ◽  
Cosme Roberto Moreira Silva
Keyword(s):  
Thermal Conductivity ◽  
Porous Alumina ◽  
Mercury Porosimetry ◽  
Tetragonal Zirconia ◽  
Porous Ceramics ◽  
Zirconia Ceramic ◽  
Artificial Satellites ◽  
High Porosity ◽  
Cooling Systems ◽  
Loop Heat Pipes

Porous ceramics are of great interest due to their numerous potential applications. The objective of the present investigation was to produce porous alumina with 3 mol % yttria-stabilized tetragonal zirconia (Y-TZP). This material will be used in cooling systems of satellites. To obtain the porous ceramics the direct foaming technique was used. This method is based on the preparation of a stable foam to which a slurry of alumina and zirconia is added. The mixture is then vigorously stirred for incorporation of air. The sintered ceramics were characterized by scanning electron microscopy, mercury porosimetry and thermal conductivity. The tests performed with the porous alumina-zirconia ceramic composite obtained by this method, showed low thermal conductivity values, high porosity and uniform microstructure with 20–100 µm open pores. The results show that the alumina-zirconia composites tested in this study have a potential for application in loop heat pipes of cooling systems of satellites.

scholarly journals Effect of Fe2O3 and CeO2 on Transmittance of Y2O3 Stabilized Tetragonal Zirconia Polycrystals

2020 ◽  
Author(s):  
Jianfeng Chen ◽  
Chundong Xue ◽  
Zhaocen Liu ◽  
Zhuoran Liang ◽  
Bo Wang ◽  
...  
Keyword(s):  
Measurement Method ◽  
Quantitative Assessment ◽  
Tetragonal Zirconia ◽  
Xrd Analysis ◽  
Dental Restoration ◽  
Light Transmittance ◽  
Zirconia Ceramic ◽  
Indirect Methods ◽  
Assessment Approach ◽  
Direct Measurement Method

Abstract The present study is to investigate the effect of metal oxides Fe2O3 and CeO2 on the structural and optical characteristics of Y2O3 stabilized tetragonal zirconia ceramic (Y-TZP). Different concentrations of Fe2O3 and CeO2 are added into Y-TZP to fabricate the colored Y-TZP. The chromaticity and transmittance were measured by spectrophotometer. The effect of each colorant on color and transmittance of Y-TZP is quantitatively studied. Most of the previous related studies used indirect methods for measurement, but in order to get more accurate results, we chose the direct measurement method. It is found that the addition of Fe2O3 and CeO2 not only changes the color of Y-TZP, but also reduces the light transmittance. The SEM characterization and XRD analysis are then performed to check the microstructure and crystal structure respectively, by which we try to understand the microscopic principle. Our findings can improve the understanding of coloration of Y-TZP by mental oxides, and support a quantitative assessment approach for aesthetic performance of dental restoration material.

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