Mechanisms and energetics in the early stages of solvent-assisted low-temperature sintering of ZnO

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.

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Work Title Mechanisms and energetics in the early stages of solvent-assisted low-temperature sintering of ZnO
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Open Access
Creators
  1. Lucas Villatte
  2. Maria Isabel Rua-Taborda
  3. Arnaud Ndayishimiye
  4. Clive A. Randall
  5. Alain Largeteau
  6. Graziella Goglio
  7. Catherine Elissalde
  8. Sylvie Bordère
Keyword
  1. Hydrothermal sintering
  2. Modelling
  3. Kinetics analysis
  4. Mechanism
  5. Stepwise isothermal densification approach
  6. Zinc oxide
License In Copyright (Rights Reserved)
Work Type Article
Publisher
  1. Materialia
Publication Date April 23, 2022
Publisher Identifier (DOI)
  1. https://doi.org/10.1016/j.mtla.2022.101418
Deposited August 02, 2022

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  • Created

    August 02, 2022 13:50 by Researcher Metadata Database

  • Added Villatte-Materialia-May2022.pdf

    August 02, 2022 13:50 by Researcher Metadata Database

  • Added Creator Lucas Villatte

    August 02, 2022 13:50 by Researcher Metadata Database

  • Added Creator Maria Isabel Rua-Taborda

    August 02, 2022 13:50 by Researcher Metadata Database

  • Added Creator Arnaud Ndayishimiye

    August 02, 2022 13:50 by Researcher Metadata Database

  • Added Creator Clive A. Randall

    August 02, 2022 13:50 by Researcher Metadata Database

  • Added Creator Alain Largeteau

    August 02, 2022 13:50 by Researcher Metadata Database

  • Added Creator Graziella Goglio

    August 02, 2022 13:50 by Researcher Metadata Database

  • Added Creator Catherine Elissalde

    August 02, 2022 13:50 by Researcher Metadata Database

  • Added Creator Sylvie Bordère

    August 02, 2022 13:50 by Researcher Metadata Database

  • Published

    August 02, 2022 13:50 by Researcher Metadata Database

  • Updated Keyword, Description, Publication Date Show Changes

    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
    • 2022-05-01
    • 2022-04-23
  • Updated

    April 04, 2024 10:21 by [unknown user]