NDAYISHIMIYE, Arnaud; SENGUL, Mert; BANG, Sun Hwi; TSUJI, Kosuke; TAKASHIMA, Kenji; HÉRISSON DE BEAUVOIR, Thomas; DENUX, Dominique; THIBAUD, Jean-Marc; VAN DUIN, Adri C.T.; ELISSALDE, Catherine; GOGLIO, Graziella; RANDALL, Clive

doi:10.1016/j.jeurceramsoc.2019.11.049

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NDAYISHIMIYE, Arnaud
Materials Research Institute
Department of Materials Science and Engineering

SENGUL, Mert
Materials Research Institute
Department of Materials Science and Engineering

BANG, Sun Hwi
Materials Research Institute
Department of Materials Science and Engineering

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Journal of the European Ceramic Society. 2020-04, vol. 40, n° 4, p. 1312-1324

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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.< Réduire

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Molecular dynamics

ReaxFF

Ceramics

Cold sintering

Hydrothermal sintering

Molecular dynamics

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

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