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Comparing hydrothermal sintering and cold sintering process: Mechanisms, microstructure, kinetics and chemistry

Ndayishimiye, Arnaud and Sengul, Mert Y. and Bang, Sun Hwi and Tsuji, Kosuke and Takashima, Kenji and Hérisson de Beauvoir, Thomas and Denux, Dominique and Thibaud, Jean-Marc and van Duin, Adri C.T. and Elissalde, Catherine and Goglio, Graziella and Randall, Clive A. Comparing hydrothermal sintering and cold sintering process: Mechanisms, microstructure, kinetics and chemistry. (2020) Journal of the European Ceramic Society, 40 (4). 1312-1324. ISSN 0955-2219

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Official URL: https://doi.org/10.1016/j.jeurceramsoc.2019.11.049

Abstract

This study reports the sintering of zinc oxide (ZnO) through the comparison between the hydrothermal sintering (HS) and the cold sintering process (CSP) operating in closed and open conditions, respectively. Sintering was performed at 155 ± 5 °C applying a pressure of 320 MPa, and during different holding times (0 min, 20 min, 40 min and 80 min). Whatever the low sintering process used, ceramics characteristics are almost similar in terms of relative densities and ZnO structure. However, several differences such as the nature of stabilized phases, grain sizes and quantities of residual molecules in the densified pellets, were characterized and explained. The formation of zinc acetate “bridges” was observed ex situ in hydrothermally sintered samples. A detailed ReaxFF molecular dynamics simulation was performed to help understand the formation mechanisms of zinc acetate “bridges” and compare the chemical activities between HS and CSP.

Item Type:Article
HAL Id:hal-02506703
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > TAIYO YUDEN CO. (JAPAN)
Other partners > The Pennsylvania State University - PENNSTATE (USA)
Laboratory name:
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Deposited On:23 Mar 2021 08:33

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