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.

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

A New Direct Measurement Method of Time Dependent Dielectric Breakdown at High Frequency

2020 ◽  
Vol 41 (10) ◽  
pp. 1460-1463
Author(s):  
Melissa Arabi ◽  
Xavier Garros ◽  
Jacques Cluzel ◽  
Mustapha Rafik ◽  
Xavier Federspiel ◽  
...  
Keyword(s):  
Direct Measurement ◽  
High Frequency ◽  
Measurement Method ◽  
Dielectric Breakdown ◽  
Time Dependent ◽  
Time Dependent Dielectric Breakdown ◽  
Direct Measurement Method

scholarly journals JOM-4S Overhauser Magnetometer and Sensitivity Estimation

Sensors ◽  
2021 ◽  
Vol 21 (22) ◽  
pp. 7698
Author(s):  
Xiaorong Gong ◽  
Shudong Chen ◽  
Shuang Zhang
Keyword(s):  
Magnetic Field ◽  
Direct Measurement ◽  
Measurement Method ◽  
Technical Specification ◽  
Estimation Method ◽  
Earth’S Magnetic Field ◽  
Sensitivity Estimation ◽  
Earth's Magnetic Field ◽  
Direct Measurement Method ◽  
Synchronous Measurement

The Overhauser magnetometer is a scalar quantum magnetometer based on the dynamic nuclear polarization (DNP) effect in the Earth’s magnetic field. Sensitivity is a key technical specification reflecting the ability of instruments to sense small variations of the Earth’s magnetic field and is closely related to the signal-to-noise ratio (SNR) of the free induction decay (FID) signal. In this study, deuterated 15N TEMPONE radical is used in our sensor to obtain high DNP enhancement. The measured SNR of the FID signal is approximately 63/1, and the transverse relaxation time T2 is 2.68 s. The direct measurement method with a single instrument and the synchronous measurement method with two instruments are discussed for sensitivity estimation in time and frequency domains under different electromagnetic interference (EMI) environments and different time periods. For the first time, the correlation coefficient of the magnetic field measured by the two instruments is used to judge the degree of the influence of the environmental noise on the sensitivity estimation. The sensitivity evaluation in the field environment is successfully realized without electrical and magnetic shields. The direct measurement method is susceptible to EMI and cannot work in general electromagnetic environments, except it is sufficiently quiet. The synchronous measurement method has an excellent ability to remove most natural and artificial EMIs and can be used under noisy environments. Direct and synchronous experimental results show that the estimated sensitivity of the JOM-4S magnetometer is approximately 0.01 nT in time domain and approximately 0.01 nT/ in frequency domain at a 3 s cycling time. This study provides a low-cost, simple, and effective sensitivity estimation method, which is especially suitable for developers and users to estimate the performance of the instrument.

MACRO- AND MICRO-DISPERSION OF SILICA IN TIRE TREAD COMPOUNDS: ARE THEY RELATED?

2021 ◽  
Author(s):  
J. Jin ◽  
W. Kaewsakul ◽  
J.W.M. Noordermeer ◽  
W.K. Dierkes ◽  
A. Blume
Keyword(s):  
Measurement Method ◽  
Silane Coupling Agent ◽  
Quantitative Measurement ◽  
Large Problem ◽  
Common View ◽  
Surface Areas ◽  
Silane Coupling ◽  
Filler Dispersion ◽  
The Common ◽  
Direct Measurement Method

ABSTRACT The dispersion of rubber fillers, such as silica, can be divided into two categories: macro- and micro-dispersion. Both dispersions are important; however, to achieve the best reinforcement of rubber, micro-dispersion of silica is crucial. The common view is that these filler dispersions are strongly related. The micro-dispersion is understood as the consequence of the continuous breakdown of filler clusters from macro-dispersion. Yet, a large problem is that an objective unequivocal direct measurement method for micro-dispersion is not available. In this study, a set of parameters is defined that are anticipated to have an influence on the micro- as well as the macro-dispersion. Mixing trials are performed with varying silanization temperature and time, different amounts of silane coupling agent, and by using silicas with different structures and specific surface areas. The degrees of micro- and macro-dispersion are evaluated by measuring the Payne effect as an indirect method for micro-dispersion and using a dispergrader for quantitative measurement of macro-dispersion. The results show that the filler dispersion processes happen simultaneously but independently. These results are supported by earlier work of Blume and Uhrlandt, who stated as well that micro- and macro-dispersion are independent. The major influencing factors on micro- and macro-dispersion of silica are also identified.

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

Novel quantitative assessment system of liver steatosis using a newly developed attenuation measurement method

2018 ◽  
Vol 48 (10) ◽  
pp. 821-828 ◽  
Author(s):  
Nobuharu Tamaki ◽  
Yohei Koizumi ◽  
Masashi Hirooka ◽  
Norihisa Yada ◽  
Hitomi Takada ◽  
...  
Keyword(s):  
Measurement Method ◽  
Quantitative Assessment ◽  
Liver Steatosis ◽  
Assessment System ◽  
Attenuation Measurement

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.

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