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

Journal Article · · Journal of the European Ceramic Society

In this study, we report 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. Lastly, 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.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Multi-Scale Fluid-Solid Interactions in Architected and Natural Materials (MUSE); Univ. of Utah, Salt Lake City, UT (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Murata Manufacturing Co., Ltd; National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR); USDOE
Grant/Contract Number:
SC0019285; 432-43 42MM; DMR-1728634; DMR-1842922; FA9550-16-1-0429
OSTI ID:
1597006
Alternate ID(s):
OSTI ID: 1596865
Journal Information:
Journal of the European Ceramic Society, Vol. 40, Issue 4; ISSN 0955-2219
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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