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Created
August 02, 2022 13:50
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Researcher Metadata Database
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Added
Villatte-Materialia-May2022.pdf
August 02, 2022 13:50
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Researcher Metadata Database
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Added Creator Lucas Villatte
August 02, 2022 13:50
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Added Creator Maria Isabel Rua-Taborda
August 02, 2022 13:50
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Added Creator Arnaud Ndayishimiye
August 02, 2022 13:50
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Added Creator Clive A. Randall
August 02, 2022 13:50
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Added Creator Alain Largeteau
August 02, 2022 13:50
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Researcher Metadata Database
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Added Creator Graziella Goglio
August 02, 2022 13:50
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Added Creator Catherine Elissalde
August 02, 2022 13:50
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Added Creator Sylvie Bordère
August 02, 2022 13:50
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Published
August 02, 2022 13:50
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Researcher Metadata Database
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September 30, 2023 09:41
by
avs5190
Keyword
- Hydrothermal sintering, Modelling, Kinetics analysis, Mechanism, Stepwise isothermal densification approach, Zinc oxide
Description
<p>The Hydro/Solvothermal Sintering (HSS) is a technique enabling the low temperature sintering of ceramics and composites, by using a solvent and uniaxial pressure. This energy-efficient technique also opens new perspectives in designing new composites with tailored functional properties. While the solvent plays a key role in reducing the sintering temperature, the modeling and deep understanding of sintering mechanisms remain an open field of investigation. This study unveils the energetics and mechanisms involved in the first stage of HSS. The strategy highlighted in this paper includes: (i) the building of a hydrothermal sintering device equipped with a dilatometer to monitor the shrinkage in situ, (ii) numerical stress calculations at the contact between particles to show the suitability of the two-particle kinetic equation, and (iii) the use of anisothermal and non-conventional stepwise isothermal methodologies for the investigation of mechanisms and energetics. The model material, ZnO, was densified to high relative densities with acetic acid as a solvent, and a pressure and temperature of 320 MPa and 150 °C, respectively. With these experimental conditions, the kinetic analysis obtained from the two methodologies is consistent and implies a dissolution reaction of the material as the rate controlling mechanism with possible coupling to grain boundary sliding. The activation energy of 90 kJ.mol<sup>—1</sup> is determined with the different analysis methodologies. The interest of the stepwise isothermal methodology in obtaining accurate activation energy is also discussed.</p>
- <p>The Hydro/Solvothermal Sintering (HSS) is a technique enabling the low temperature sintering of ceramics and composites, by using a solvent and uniaxial pressure. This energy-efficient technique also opens new perspectives in designing new composites with tailored functional properties. While the solvent plays a key role in reducing the sintering temperature, the modeling and deep understanding of sintering mechanisms remain an open field of investigation. This study unveils the energetics and mechanisms involved in the first stage of HSS. The strategy highlighted in this paper includes: (i) the building of a hydrothermal sintering device equipped with a dilatometer to monitor the shrinkage in situ, (ii) numerical stress calculations at the contact between particles to show the suitability of the two-particle kinetic equation, and (iii) the use of anisothermal and non-conventional stepwise isothermal methodologies for the investigation of mechanisms and energetics. The model material, ZnO, was densified to high relative densities with acetic acid as a solvent, and a pressure and temperature of 320 MPa and 150 °C, respectively. With these experimental conditions, the kinetic analysis obtained from the two methodologies is consistent and implies a dissolution reaction of the material as the rate controlling mechanism with possible coupling to grain boundary sliding. The activation energy of 90 kJ.mol^(-1) is determined with the different analysis methodologies. The interest of the stepwise isothermal methodology in obtaining accurate activation energy is also discussed.</p>
Publication Date
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Updated
April 04, 2024 10:21
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