Wetting behavior and mechanism of glass coatings on samarium–cobalt alloys in the heating process
| Autor: | Yong-Yan Li, Yikun Fang, Xiao-Jie Yu, Shuai Wang, Zhi-Yong Luo, Wei Han |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Scanning electron microscope Process Chemistry and Technology 02 engineering and technology Surface finish 021001 nanoscience & nanotechnology 01 natural sciences Capillary number Surfaces Coatings and Films Electronic Optical and Magnetic Materials Contact angle Sessile drop technique Wetting transition 0103 physical sciences Materials Chemistry Ceramics and Composites Surface roughness Wetting Composite material 0210 nano-technology |
| Zdroj: | Ceramics International. 46:22980-22986 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2020.06.073 |
| Popis: | The wetting behavior of glass coatings on samarium-cobalt alloys with different roughness at elevated temperatures in air was investigated by a sessile drop method. The wetting properties were analyzed through several parameters, including apparent contact angle, height and diameter of a glass cylinder on the samarium-cobalt alloy, determined by using a high temperature microscope. The morphology evolution of the glass coating was observed by using a scanning electron microscope. The results show that the glass cylinder contracts initially, and then swells followed by wetting and spreading on the samarium-cobalt alloy substrate. This process is explained by the role of air and the increase of capillary number. The dependence of apparent contact angle on surface roughness is related to interface reaction. It is concluded that the surface roughness firstly increases the contact angle, but then promotes wetting due to the wetting transition changing from the Cassie−Baxter state to the Wenzel state in the non-reactive wetting range. The surface roughness hinders the spreading of the glass melt due to the interface reaction between glass and samarium-cobalt alloys in the reactive wetting range. |
| Databáze: | OpenAIRE |
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