scholarly journals Fractal corrections of BaTiO3-ceramic sintering parameters

2014 ◽  
Vol 46 (2) ◽  
pp. 149-156 ◽  
Author(s):  
V.V. Mitic ◽  
Lj. Kocic ◽  
V. Paunovic ◽  
V. Pavlovic
Keyword(s):  
Viscous Flow ◽  
Fractal Geometry ◽  
Particle Dynamics ◽  
Quasi Equilibrium ◽  
Green Body ◽  
Sintering Process ◽  
Area Reduction ◽  
Ceramic Sintering ◽  
Angle Of View ◽  
Surface Area Reduction

Morphology of ceramics grains and pores as well as Brownian character of particle dynamics inside ceramics specimen contributes to better understanding of the sintering process. BaTiO3-ceramics, studied in this paper, has light fractal form and it is emanated in three aspects. First, the surface of grains, even in starting green body as well as distribution of grains shows fractal behavior. Second, existence of pores and their distribution follow the rules of fractal geometry. Third, movement of particles inside viscous flow underlies the rule of Brownian motion, which is essentially a fractal category. These three elements, each in its domain influence sintering dynamics, and can be described by dimensionless quantitative factors, ?s ?p and ?m, being normalized to the interval [0,1]. Following sintering process, the associate formulae of Frenkel, Scherer and Mackenzie-Shuttleworth are shown from the angle of view of ceramics fractal dimension changing that approaches to 3. Also, it is shown that the energy balance is not violated after applying fractal correction to quasi equilibrium of the energy emanating from surface area reduction ES and energy adopted by viscous flow Ef .

Correction to Hydrothermal-Assisted Cold Sintering Process: A New Guidance for Low Temperature Ceramic Sintering

2016 ◽  
Vol 8 (49) ◽  
pp. 34170-34170 ◽  
Author(s):  
Hanzheng Guo ◽  
Jing Guo ◽  
Amanda Baker ◽  
Clive A. Randall
Keyword(s):  
Low Temperature ◽  
Sintering Process ◽  
Ceramic Sintering

Three-Dimensional Photography for Measuring Volumetric Changes After Submental Cryolipolysis

2018 ◽  
Vol 35 (3) ◽  
pp. 135-142
Author(s):  
Adam Honeybrook ◽  
Jason D. Bloom ◽  
Charles Woodard ◽  
Eric F. Bernstein
Keyword(s):  
Surface Area ◽  
Imaging Technique ◽  
Three Dimensional ◽  
Prospective Analysis ◽  
High Quality ◽  
3 Dimensional ◽  
Area Reduction ◽  
Fat Thickness ◽  
Submental Fat ◽  
Surface Area Reduction

High-resolution 3-dimensional photography offers unparalleled advantages in objective and detailed skin contour characterization, quantification, volumetric and surface area analysis. This study aims to illustrate the benefits of 3-dimensional photography through analysis of noninvasive reduction of submental fat using cryolipolysis. A nonrandomized prospective analysis was performed of 14 selected patients who underwent treatment with cryolipolysis (CoolSculpting System; Zeltiq) between February and June 2016. The benefits of 3-dimensional photography (Vectra; Canfield Scientific) are presented. High-quality 3-dimensional images are presented to illustrate the utility of 3-dimensional photography as a means to quantitatively evaluate changes in submental volume, fat thickness, and surface area reduction, thereby exemplifying the broad applicability of this imaging technique. Three-dimensional photography technology provides clinicians with enhanced options that extend beyond simple 2-dimensional photography. Our study illustrates the benefits of the technology for accurately measuring volumetric changes after submental cryolipolysis treatment.

scholarly journals Multiferroic Properties of Nanopowder-Synthesized Ferroelectric-Ferromagnetic 0.6BaTiO3-0.4NiFe2O4Ceramic

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Xinye Xu ◽  
Zheng Wu ◽  
Yanmin Jia ◽  
Weijian Li ◽  
Yongsheng Liu ◽  
...  
Keyword(s):  
Relative Dielectric Constant ◽  
Composite Ceramic ◽  
Sintering Process ◽  
Frequency Range ◽  
Multiferroic Properties ◽  
Measured Frequency Range ◽  
Ceramic Sintering ◽  
Chemical Synthesis Route ◽  
Ferromagnetic Magnetization ◽  
Sol Precursor

Multiferroic 0.6BaTiO3-0.4NiFe2O4dense nanoceramic composites were synthesized via a powder-in-sol precursor hybrid chemical synthesis route and a ceramic sintering process. At the measured frequency range (1 kHz~1 MHz), the relative dielectric constant is 150~1670 and the dielectric loss is 0.05~0.70. The composite ceramic showed obvious coexistence of ferroelectric and ferromagnetic phases. With the increase of temperature, the saturation ferromagnetic magnetization decreases, while the ferroelectric polarization increases.

MgO-Al2O3-SiO2 Glass-Ceramic Prepared by Sol-Gel Method

2010 ◽  
Vol 92 ◽  
pp. 131-137 ◽  
Author(s):  
Qiu Hua Yuan ◽  
Pei Xin Zhang ◽  
Li Gao ◽  
Hai Lin Peng ◽  
Xiang Zhong Ren ◽  
...  
Keyword(s):  
Glass Ceramic ◽  
Crystallization Behavior ◽  
Glass Powder ◽  
Sol Gel ◽  
Glass Ceramics ◽  
Green Body ◽  
Sintering Process ◽  
X Ray Diffraction ◽  
Sio2 Glass ◽  
X Ray

The crystallization behavior of MgO-Al2O3-SiO2 glass-ceramics by sol-gel technology was investigated by using x-ray diffraction (XRD), differential thermal analysis (DTA), Scanning electron microscopy (SEM). The results showed that: (1)α-cordierite phase was precipitated when the green body was calcined at 1050°C, and α-cordierite of high purity and stability could be formed at 1100°C; (2) Adding an appropriate amount of low melting point glass powder into the green body may provide liquid-phase environment during the sintering process, which will help enhance the tightness density of glass-ceramic, and thus improve its flexural strength.

Fabrication of SiC Dense-Porous Laminates by Electrophoretic Deposition Process

2008 ◽  
Vol 368-372 ◽  
pp. 1841-1843
Author(s):  
Yuan Li ◽  
Ji Qiang Gao ◽  
Jian Feng Yang ◽  
Hong Jie Wang ◽  
Guan Jun Qiao
Keyword(s):  
Electrophoretic Deposition ◽  
Deposition Process ◽  
Green Body ◽  
Sintering Process ◽  
Laminated Structure ◽  
Porous Layers ◽  
Sic Ceramics ◽  
Vacuum Atmosphere ◽  
One Step ◽  
Pore Fraction

In order to obtain dense-porous laminated structure in green bodies of SiC ceramics, rapid aqueous electrophoretic deposition (EPD) was introduced. The suspension for the electrophoretic deposition was prepared using silicon carbide, silicon and carbon powders as the starting materials. During the electrophoretic deposition process, the intending dense and porous layers were deposited alternately to form the green body. After drying, the green bodies were reaction-bonded at 1550°C in vacuum atmosphere. Pore fraction of the porous layers could be adjusted by changing process preferences of EPD and suspension composition. Pore size and size distribution could be controlled by using different sized starting powders. Using this process, no additional substance is necessary to generate the pores via burnt-off, and the dense/porous laminated structure can be obtained by one-step sintering process.

Hydrothermal-Assisted Cold Sintering Process: A New Guidance for Low-Temperature Ceramic Sintering

2016 ◽  
Vol 8 (32) ◽  
pp. 20909-20915 ◽  
Author(s):  
Hanzheng Guo ◽  
Jing Guo ◽  
Amanda Baker ◽  
Clive A. Randall
Keyword(s):  
Low Temperature ◽  
Sintering Process ◽  
Ceramic Sintering

Microwave Sintering of Large Products

1996 ◽  
Vol 430 ◽  
Author(s):  
Tasaburo Saji
Keyword(s):  
Dielectric Loss ◽  
Wave Energy ◽  
Microwave Sintering ◽  
Processing System ◽  
Uniform Electric Field ◽  
Sintering Process ◽  
Gyrotron Oscillator ◽  
Microwave Ceramic ◽  
Fine Crystalline Structure ◽  
Ceramic Sintering

AbstractA practical microwave ceramic sintering technology has been developed. To achieve the highest merit from microwave sintering, susceptors were not used. In this paper, the ceramic sintering process using the 28GHz mm-wave energy generated by a Gyrotron oscillator is described. Large sized (Φ 200 × 200 ) and complex shaped material of Si3N4, A12O3, and ZrO2 were successfully and reproducibly sintered. The sintered bodies exhibited high density and fine crystalline structure. The processed materials were found to have exceptional strength and toughness.The critical processing technology developed dealt with the means by which uniform and defect free sintered bodies are obtained. The processing stressed the importance of achieving a uniform electric field within the applicator and to decrease the sintering dependence on the materials’ temperature based dielectric loss properties. With the use of innovative support and thermal insulation structures, the processing system allowed for very precise temperature controls.

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