Beyond flash sintering: How the flash event could change ceramics and glass processing

2020 ◽  
Vol 187 ◽  
pp. 49-56 ◽  
Author(s):  
Mattia Biesuz ◽  
Vincenzo M. Sglavo
Keyword(s):  
Flash Sintering ◽  
Glass Processing ◽  
Flash Event

scholarly journals Gd/Sm-Pr Co-Doped Ceria: A First Report of the Precipitation Method Effect on Flash Sintering

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1218 ◽  
Author(s):  
Luca Spiridigliozzi ◽  
Lorenzo Pinter ◽  
Mattia Biesuz ◽  
Gianfranco Dell’Agli ◽  
Grazia Accardo ◽  
...  
Keyword(s):  
Ammonia Solution ◽  
Current Control ◽  
Precipitation Method ◽  
Precipitation Process ◽  
Sintering Behavior ◽  
Method Effect ◽  
Flash Sintering ◽  
Co Precipitation ◽  
First Time ◽  
Flash Event

In this work, ceria-based ceramics with the composition Gd0.14Pr0.06Ce0.8O2-δ and Sm0.14Pr0.06Ce0.8O2-δ, were synthesized by a simple co-precipitation process using either ammonium carbonate or ammonia solution as a precipitating agent. After the calcination, all of the produced samples were constituted by fluorite-structured ceria only, thus showing that both dopant and co-dopant cations were dissolved in the fluorite lattice. The ceria-based nanopowders were uniaxially compacted and consequently flash-sintered using different electrical cycles (including current-ramps). Different results were obtained as a function of both the adopted precipitating agent and the applied electrical cycle. In particular, highly densified products were obtained using current-ramps instead of “traditional” flash treatments (with the power source switching from voltage to current control at the flash event). Moreover, the powders that were synthesized using ammonia solution exhibited a low tendency to hotspot formation, whereas the materials obtained using carbonates as the precipitating agent were highly inhomogeneous. This points out for the first time the unexpected relevance of the precipitating agent (and of the powder shape/degree of agglomeration) for the flash sintering behavior.

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

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 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

scholarly journals Development of a processing map for safe flash sintering of Gadolinium‐doped Ceria

2021 ◽  
Author(s):  
Tarini Prasad Mishra ◽  
Christian Lenser ◽  
Rishi Raj ◽  
Olivier Guillon ◽  
Martin Bram
Keyword(s):  
Processing Map ◽  
Doped Ceria ◽  
Flash Sintering ◽  
Gadolinium Doped Ceria

Fabrication of ZrO 2 /rGO nanocomposites by flash sintering under AC electric fields

2021 ◽  
Author(s):  
Xinghua Su ◽  
Mengying Fu ◽  
Gai An ◽  
Zhihua Jiao ◽  
Qiang Tian ◽  
...  
Keyword(s):  
Electric Fields ◽  
Ac Electric Fields ◽  
Flash Sintering

scholarly journals Controlled current-rate AC flash sintering of uranium dioxide

2021 ◽  
Vol 547 ◽  
pp. 152780
Author(s):  
R.R. Ingraci Neto ◽  
K.J. McClellan ◽  
D.D. Byler ◽  
E. Kardoulaki
Keyword(s):  
Uranium Dioxide ◽  
Flash Sintering
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