Thermally-insulated ultra-fast high temperature sintering (UHS) of zirconia: A master sintering curve analysis

Dong, Jin‐Yong; Pouchlý, Václav; Biesuz, Mattia; Tyrpekl, Václav; Vilémová, Monika; Kermani, Milad; Reece, Mike; Hu, Chunfeng; Grasso, Salvatore

doi:10.1016/j.scriptamat.2021.114076

Cited by 48 publications

(26 citation statements)

References 26 publications

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“…Very recently, density evolution during ultrafast high-temperature sintering of 3YSZ has been successfully modeled using the combined finite element method and MSC. 16 The authors have shown that experimental RD fits well with the results obtained from the model. Additionally, it was shown that the MSC model likely remains valid even in the case of ultrahigh heating rates (∼2000 • C/min.…”

Section: Introductionmentioning

confidence: 55%

“…MSC resolves this issue as it includes the effect of starting RD, microstructure, and independent of thermal history, once it is constructed from the experimental data for a particular set of powder aggregates. Very recently, density evolution during ultrafast high‐temperature sintering of 3YSZ has been successfully modeled using the combined finite element method and MSC 16 . The authors have shown that experimental RD fits well with the results obtained from the model.…”

Section: Introductionmentioning

confidence: 78%

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Investigation on the role of Joule heating on flash sintering using a combined experimental and modeling approach

et al. 2022

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Flash sintering is a novel technique of ultrafast densification. There is a continuous debate over the mechanisms that are responsible for such fast sintering. In this work, we have assessed the role of Joule heating and thermal runaway on densification using a combined experimental and modeling approach. First, flash sintering (FS) experiments have been carried out for three different oxides that have very different electrical and thermal conductivities, namely, 3-and 8-mol% yttria-stabilized zirconia and titania (TiO 2 ). Then, we modeled the densification during FS, for identical experimental conditions, using a novel combined finite element modeling and master sintering curve approach. The results obtained through experiment and modeling have been compared. Finally, our results show that ultrafast densification observed during FS cannot be replicated through Joule heating and thermal runaway alone at low current density (<100 mA/mm 2 ), suggesting that a contribution from other mechanisms is likely essential to explain the observed ultrafast densification. However, Joule heating and thermal runaway can account for the ultrafast densification at higher than 100 mA/mm 2 current density.

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Section: Introductionmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 78%

Investigation on the role of Joule heating on flash sintering using a combined experimental and modeling approach

et al. 2022

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“…The temperature inhomogeneity is induced by the rapid heat dissipation to the environment through conduction and radiation, therefore, can be suppressed by a thermal insulator. [ 9 ] Additionally, the simulation results reveal that the largest heat dissipation appears at the ends of the pellet sample close to the opening of the carbon felt. Hence, the temperature gradient can be mitigated by increasing the width of the carbon felt.…”

Section: Resultsmentioning

confidence: 99%

“…Mishra et al [ 26 ] adopted finite element methods (FEM) to simulate the temperature distribution in strontium titanite (STO) during UHS and found that the temperature required to densify the ceramic green body by UHS is comparable to that by conventional sintering (CS). Dong et al [ 9 ] used the master sintering curve (MSC) approach combined with FEM to predict the densification of 3 mol% yttria‐stabilized zirconia (3YSZ) during a thermally insulated UHS. In their study, the apparent activation energy for densification was fitted as 680 kJ mol −1 , which is similar to the literature values of 3YSZ.…”

Section: Introductionmentioning

confidence: 99%

Electric Current‐Assisted Sintering of 8YSZ: A Comparative Study of Ultrafast High‐Temperature Sintering and Flash Sintering

et al. 2023

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Electric current‐assisted sintering (ECAS) is a promising powder consolidation technique that can achieve short‐term sintering with high heating rates. Currently, main methods of performing ECAS are indirect heating of the powder compact in a conductive tool or direct heating with current flowing through the powder compact. Various influencing factors have been identified to explain the rapid densification during ECAS, such as ultrahigh heating rates, extra‐high temperatures, and electric field. However, the key consolidation‐enhancing factor is still under debate. This study aims at understanding the role of heating rate on the enhanced densification during ECAS of 8 mol% Y2O3‐stabilized ZrO2 (8YSZ) by experimental and numerical methods. Two different heating modes, ultrafast high‐temperature sintering (UHS, indirect heating) and flash sintering (FS, direct heating), are studied. The novel UHS technique is successfully applied to consolidate the 8YSZ samples. Additionally, finite element methods (FEM) combined with a constitutive model is adopted to predict the densification and grain growth. Furthermore, a comparison of UHS and FS is performed to investigate the thermal effect (heating rate) and athermal effect (electric field) individually. The results indicate that the high heating rate is the key factor of the rapid densification during UHS and FS of 8YSZ.

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“…during sintering, which is essential to prepare oxide electrolytes for solid-state batteries. [7][8][9] Third, the ultrafast heating rate and high temperature promote the materials evolving to a nonequilibrium state, which would possibly bring unexpected benefits, such as reducing activation energy for densification, 10 enhancing, 11 or hindering 12 certain phase transformations.…”

Section: Introductionmentioning

confidence: 99%

Far from equilibrium ultrafast high‐temperature sintering of ZrO₂–SiO₂ nanocrystalline glass–ceramics

Sathyanath

et al. 2023

J Am Ceram Soc.

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Ultrafast high‐temperature sintering (UHS) is a novel sintering technique with ultrashort firing cycles (e.g., a few tens of seconds). The feasibility of UHS has been validated on several ceramics and metals; however, its potential in consolidating glass–ceramics has not yet been demonstrated. In this work, an optimized carbon‐free UHS was utilized to prepare ZrO2–SiO2 nanocrystalline glass–ceramics (NCGCs). The phase composition, grain size, densification behavior, and microstructures of NCGCs prepared by UHS were investigated and compared with those of samples sintered by pressureless sintering. Results showed that NCGCs with a high relative density (～95%) can be obtained within ～50 s discharge time by UHS. The UHS processing not only hindered the formation of ZrSiO4 and cristobalite but also enhanced the stabilization of t‐ZrO2. Meanwhile, owing to the ultrashort firing cycles, the UHS technology allowed the NCGCs to be consolidated in a far from equilibrium state. The NCGCs showed a microstructure of spherical monocrystalline ZrO2 nanocrystallites embedded in an amorphous SiO2 matrix.

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Thermally-insulated ultra-fast high temperature sintering (UHS) of zirconia: A master sintering curve analysis

Cited by 48 publications

References 26 publications

Investigation on the role of Joule heating on flash sintering using a combined experimental and modeling approach

Investigation on the role of Joule heating on flash sintering using a combined experimental and modeling approach

Electric Current‐Assisted Sintering of 8YSZ: A Comparative Study of Ultrafast High‐Temperature Sintering and Flash Sintering

Far from equilibrium ultrafast high‐temperature sintering of ZrO₂–SiO₂ nanocrystalline glass–ceramics

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Thermally-insulated ultra-fast high temperature sintering (UHS) of zirconia: A master sintering curve analysis

Cited by 48 publications

References 26 publications

Investigation on the role of Joule heating on flash sintering using a combined experimental and modeling approach

Investigation on the role of Joule heating on flash sintering using a combined experimental and modeling approach

Electric Current‐Assisted Sintering of 8YSZ: A Comparative Study of Ultrafast High‐Temperature Sintering and Flash Sintering

Far from equilibrium ultrafast high‐temperature sintering of ZrO2–SiO2 nanocrystalline glass–ceramics

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Far from equilibrium ultrafast high‐temperature sintering of ZrO₂–SiO₂ nanocrystalline glass–ceramics