Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 41, Issue 15, Pages 7464-7468Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2021.08.016
Keywords
Wetting behavior; Interfacial reaction; Microstructure; Wetting mechanism
Categories
Funding
- National Natural ScienceFoundations of China [52005410]
- Natural Science Basic Research Program of Shaanxi [2020JQ-190]
- China Post-doctoral Science Foundation [2019TQ0263, 2020M683560]
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The study investigated the wetting and spreading behaviors of molten Ag-Zr filler on ZrC-SiC ceramic surface, showing that the wetting process was controlled by interfacial reaction due to Zr activity difference, leading to the promotion of wetting and spreading on the ZrC-SiC surface.
In this study, the isotherm wetting and spreading behaviors of molten Ag-Zr filler on ZrC-SiC ceramic surface was investigated using a sessile drop method in vacuum. The effect of Zr content in Ag-Zr filler on the wetting behavior was studied, and the wetting mechanism was revealed in details. The results showed that the contact angle of Ag-Zr filler on the ZrC-SiC surface decreased from 140 degrees to 20 degrees with the Zr content varied from 0 to 8 wt.%, and the Zr was the key factor to the wetting process. The wetting dynamic analysis illustrated that the interfacial reaction controlled the wetting of Ag-Zr filler on the ZrC-SiC surface. Due to the Zr activity difference at Ag-Zr/ZrC interface, the ZrC released C into Ag-Zr filler, and reacted with Zr to form new-born ZrC with higher Zr content. The formation of the new-born ZrC promoted wetting and spreading of Ag-Zr filler on ZrC-SiC surface.
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