Graphite assisted flash sintering of Sm2O3 doped CeO2 ceramics at the onset temperature of 25 °C

2019 ◽  
Vol 159 ◽  
pp. 72-75 ◽  
Author(s):  
Lili Guan ◽  
Jian Li ◽  
Xiwen Song ◽  
Jinxiao Bao ◽  
Tao Jiang
Keyword(s):  
Onset Temperature ◽  
Flash Sintering ◽  
Doped Ceo2

Flash sintering scaling-up challenges: Influence of the sample size on the microstructure and onset temperature of the flash event

2020 ◽  
Vol 186 ◽  
pp. 1-5
Author(s):  
João V. Campos ◽  
Isabela R. Lavagnini ◽  
João G. Pereira da Silva ◽  
Julieta A. Ferreira ◽  
Rafael V. Sousa ◽  
...  
Keyword(s):  
Sample Size ◽  
Scaling Up ◽  
Onset Temperature ◽  
Flash Sintering ◽  
Flash Event

Flash Sintering of (La, Sr)(Co, Fe)O3 -Gd-Doped CeO2 Composite

2015 ◽  
Vol 98 (6) ◽  
pp. 1747-1752 ◽  
Author(s):  
Anshu Gaur ◽  
Vincenzo M. Sglavo
Keyword(s):  
Flash Sintering ◽  
Doped Ceo2

scholarly journals Liquid-Film Assisted Mechanism of Reactive Flash Sintering in Oxide Systems

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1494 ◽  
Author(s):  
Rachman Chaim ◽  
Yaron Amouyal
Keyword(s):  
Liquid Film ◽  
Binary Systems ◽  
Solid Phase ◽  
Equilibrium Phase ◽  
Equilibrium Phase Diagram ◽  
Onset Temperature ◽  
Phase Assemblage ◽  
Reaction Products ◽  
Oxide Systems ◽  
Flash Sintering

Reactive flash sintering in oxide systems is analyzed assuming the formation of a liquid film at the particle contacts at the flash onset temperature. Formation of intermediate phases, as well as phase assemblage, are predicted upon optimal conditions of the electric field and current density. In single-phase impure oxides, the solidus and the solubility limit determine the flash onset temperature. In reacting binary systems, the composition of the liquidus determines primarily the reaction products during the cooling. In multicomponent systems, the oxide with the lowest flash temperature forms the interfacial liquid film, and the solid phase assemblage follows the equilibrium phase diagram. Examples from literature are consistent with reactive flash sintering and flash sintering assisted by a transient liquid film.

scholarly journals Effect of Processing Conditions on the Flash Onset Temperature in Hydroxyapatite

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5229
Author(s):  
Changhun Hwang ◽  
Jondo Yun
Keyword(s):  
Grain Size ◽  
Electric Field ◽  
Color Change ◽  
Onset Temperature ◽  
Processing Conditions ◽  
Conduction Path ◽  
Flash Sintering ◽  
Vacuum Atmosphere ◽  
Lower Temperature ◽  
Short Time

When heat and electric field are applied to the sample, sintering takes place within a short time of a few seconds by the flash phenomenon that occurs. In what condition flash does occur is a main issue for the flash sintering technique. In this study, the effect of processing conditions such as sintering atmosphere, sample size, density and grain size on the flash onset of hydroxyapatite was investigated. In a vacuum atmosphere, a flash occurred at a lower temperature by 50–100 °C than in air. The smaller the thickness of the sample, the higher the flash onset temperature due to the larger specific surface area. Flash was also observed in samples which were presintered, having a density of 86–100% and a grain size of 0.2–0.9 μm. When the density and grain size of the sample were higher and larger, the flash onset temperature was higher. It was because the diffusion and conduction path through the grain boundary and the inner surface of the pores with high defect concentration are blocked with an increase of density or grain size. When an electric field was applied during flash sintering, a color change of the sample was observed and the reason was discussed.

Reordering and Crystallization of Silicon Carbide Amorphized by Neutron Irradiation

2000 ◽  
Vol 650 ◽  
Author(s):  
Lance L. Snead ◽  
Martin Balden
Keyword(s):  
Thin Film ◽  
Silicon Carbide ◽  
Crystallization Kinetics ◽  
Neutron Irradiation ◽  
Onset Temperature ◽  
Kinetics Of Crystallization ◽  
Crystallization Onset Temperature ◽  
Crystallization Onset ◽  
Kinetics Of

ABSTRACTDensification and crystallization kinetics of bulk SiC amorphized by neutron irradiation is studied. The temperature of crystallization onset of this highly pure, fully amorphous bulk SiC was found to be between 875-885°C and crystallization is nearly complete by 950°C. In-situ TEM imaging confirms the onset of crystallization, though thin-film effects apparently alter the kinetics of crystallization above this temperature. It requires >1125°C for complete crystallization of the TEM foil. Annealing at temperatures between the irradiation and crystallization onset temperature is seen to cause significant densification attributed to a relaxation, or reordering, of the as-amorphized structure.

Zn-Doped CeO2 Nanorods for Glycerol Carbonylation with CO2

2021 ◽  
Author(s):  
Nagendra Kulal ◽  
Rajappan Vetrivel ◽  
N. S. Ganesh Krishna ◽  
Ganapati V. Shanbhag
Keyword(s):  
Doped Ceo2

scholarly journals Effects of Flash Sintering Parameters on Performance of Ceramic Insulator

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1157
Author(s):  
Yong Liu ◽  
Xingwang Huang
Keyword(s):  
Grain Size ◽  
Electric Field ◽  
Field Intensity ◽  
Current Density ◽  
Electric Field Intensity ◽  
Unit Cell ◽  
Uniform Structure ◽  
Ceramic Insulator ◽  
Flash Sintering ◽  
Ceramic Insulators

Ceramic outdoor insulators play an important role in electrical insulation and mechanical support because of good chemical and thermal stability, which have been widely used in power systems. However, the brittleness and surface discharge of ceramic material greatly limit the application of ceramic insulators. From the perspective of sintering technology, flash sintering technology is used to improve the performance of ceramic insulators. In this paper, the simulation model of producing the ceramic insulator by the flash sintering technology was set up. Material Studio was used to study the influence of electric field intensity and temperature on the alumina unit cell. COMSOL was used to study the influence of electric field intensity and current density on sintering speed, density and grain size. Obtained results showed that under high temperature and high voltage, the volume of the unit cell becomes smaller and the atoms are arranged more closely. The increase of current density can result in higher ceramic density and larger grain size. With the electric field intensity increasing, incubation time shows a decreasing tendency and energy consumption is reduced. Ceramic insulators with a higher uniform structure and a smaller grain size can show better dielectric performance and higher flashover voltage.

scholarly journals Effect of the Hybrid Hydrophobic-Hydrophilic Nanostructured Surface on Explosive Boiling

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 212
Author(s):  
Ming-Jun Liao ◽  
Li-Qiang Duan
Keyword(s):  
Liquid Film ◽  
Coating Thickness ◽  
Bubble Nucleation ◽  
Onset Temperature ◽  
Dynamics Simulation ◽  
Hydrophilic Surface ◽  
Pillar Width ◽  
Nanostructured Surface ◽  
Explosive Boiling ◽  
Hydrophobic Coating

The influence of different wettability on explosive boiling exhibits a significant distinction, where the hydrophobic surface is beneficial for bubble nucleation and the hydrophilic surface enhances the critical heat flux. Therefore, to receive a more suitable surface for the explosive boiling, in this paper a hybrid hydrophobic–hydrophilic nanostructured surface was built by the method of molecular dynamics simulation. The onset temperatures of explosive boiling with various coating thickness, pillar width, and film thicknesses were investigated. The simulation results show that the hybrid nanostructure can decrease the onset temperature compared to the pure hydrophilic surface. It is attributed to the effect of hydrophobic coating, which promotes the formation of bubbles and causes a quicker liquid film break. Furthermore, with the increase of the hydrophobic coating thickness, the onset temperature of explosive boiling decreases. This is because the process of heat transfer between the liquid film and the hybrid nanostructured surface is inevitably enhanced. In addition, the onset temperature of explosive boiling on the hybrid wetting surface decreases with the increase of pillar width and liquid film thickness.

scholarly journals Flash sintering of zircon: rapid consolidation of an ultrahigh bandgap ceramic

2021 ◽  
pp. 1-8
Author(s):  
Juan Manuel Martinez ◽  
Mattia Biesuz ◽  
Jian Dong ◽  
Matias Gauna ◽  
Gustavo Suarez ◽  
...  
Keyword(s):  
Flash Sintering
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