Comparing hydrothermal sintering and cold sintering process: Mechanisms, microstructure, kinetics and chemistry
Comparing hydrothermal sintering and cold sintering process: Mechanisms, microstructure, kinetics and chemistry
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DOI：
10.1016/j.jeurceramsoc.2019.11.049
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发表时间：
2020-04-01
影响因子：
5.7
通讯作者：
Randall, Clive A.
中科院分区：
文献类型：
--
作者：
Ndayishimiye, Arnaud;Sengul, Mert Y.;Randall, Clive A.
本研究报告的氧化锌（ZnO）的烧结通过水热烧结（HS）和冷烧结工艺（CSP）之间的比较，分别在封闭和开放的条件下操作。烧结在155 +/-5 ° C下施加320 MPa的压力并且在不同的保持时间（0分钟、20分钟、40分钟和80分钟）期间进行。无论使用何种低烧结工艺，陶瓷特性在相对密度和ZnO结构方面几乎相似。然而，几个差异，如稳定相的性质，晶粒尺寸和致密化球团中的残留分子的量，进行了表征和解释。在水热烧结样品中观察到醋酸锌“桥”的形成。进行了详细的ReaxFF分子动力学模拟，以帮助理解乙酸锌“桥”的形成机制，并比较HS和CSP之间的化学活性。
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 degrees 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.