Green preparation of in situ Cr3C2 nano-coatings on graphite surface and their water-wettability and rheological properties |
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Authors: | Xiaoguang Liu Shaowei Zhang Yan Li |
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Affiliation: | 1. Department of Inorganic Nonmetallic Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. College of Engineering, Mathematics and Physics Sciences, University of Exeter, EX4 4QF Exeter, UK |
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Abstract: | Cr3C2 coatings were successfully prepared on the surface of graphite flakes via a molten salt route by mixing Cr powders with natural graphite flakes in a binary LiCl-KCl salt at 450–950?°C for 4–12?h. The phases and microstructures of the coatings were verified by its XRD/XPS spectra and SEM/AFM observations, respectively. Together with the dissolution/dispersion evidence of chromium powders after interaction with the salt, and the slightly increased particle sizes due to the formation of Cr3C2 coatings on graphite flakes, a ‘template-growth’ kinetic process was therefore proposed on the formation of such coatings in the molten salt. The resultant coatings decreased the contact angle between water and graphite from 101° to ~ 75° and lowered the apparent viscosities of graphite water slurry by two orders of magnitude accordingly, suggesting that the coatings will afford graphite with good processing abilities for carbon-water based materials. |
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Keywords: | Molten salt(A) Coatings (B) Rheology (C) Water-wettability (C) Graphite (D) Corresponding author |
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