The effect of liquid phase chemistry on the densification and strength of cold sintered ZnO
The effect of liquid phase chemistry on the densification and strength of cold sintered ZnO
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DOI：
10.1016/j.jeurceramsoc.2022.11.071
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发表时间：
2022-12-15
影响因子：
5.7
通讯作者：
Randall, Clive
中科院分区：
文献类型：
--
作者：
Jabr, Abdullah;Fanghanel, Julian;Randall, Clive
冷烧结是一种化学机械致密化工艺，其允许陶瓷在低于300 ℃的低温下致密化。烧结温度的这种显著降低是通过外部施加的压力和相容的瞬时液相实现的。在本文中，氧化锌冷烧结使用各种商业有机酸：甲酸，乙酸和柠檬酸。这些不同的瞬态阶段的致密化，显微组织演变和力学响应的影响进行了研究。通过傅里叶变换红外光谱、热重分析和透射电子显微镜分析，解释了冷烧结过程中的化学相互作用。甲酸和乙酸实现了高相对密度（~96%），而柠檬酸获得了差的致密化（<80%），尽管氧化锌的预期溶解度较高。与乙酸相比，在用甲酸烧结的样品中发现更高的双轴强度（即，90 MPa与- 40 MPa）的断裂力学性能进行了讨论。
Cold sintering is a chemo-mechanical densification process which allows densification of ceramics at low tem-peratures below 300 degrees C. This substantial reduction in the sintering temperature is enabled by an externally applied pressure and a compatible transient liquid phase. In this paper, ZnO is cold sintered using various commercial organic acids: formic, acetic and citric acid. The effect of these different transient phases on densification, microstructural evolution and mechanical response is investigated. Fourier transform infrared spectroscopy, thermogravimetric analyses and transmission electron microscopy were conducted to explain the chemical interactions in the cold sintering process. High relative densities (-96 %) were achieved by formic and acetic acid, whereas poor densification was obtained for citric acid (< 80 %), despite the higher expected sol-ubility of zinc oxide. The higher biaxial strength found in samples sintered with formic acid compared to acetic acid (i.e.-90 MPa vs.-40 MPa) is discussed supported by fractographic analyses.