Improved wettability of barium-aluminium-silicate glass on carbon/carbon composites via coating modification
Authors: F. Lan, K. Li, H. Li, L. Zhang, X. Shen
Source: Surface Engineering
Publisher: Maney Publishing
Abstract:
In this paper, three kinds of modification coating were prepared to improve wettability of barium-aluminium-silicate glass on carbon/carbon (C/C) composites. The SiC coating was prepared by pack cementation; Cr3C2 and ternary Cr-Si-C coatings were prepared by evaporation reaction process. Contact angles of glass on modified C/C composites were measured at different temperatures by sessile drop technique. Microstructures and morphologies of the wetting interface were determined by scanning electron microscopy, X-ray diffraction and energy dispersive spectroscopy. Wetting experimental results revealed that barium-aluminium-silicate glass failed to wet the surface of pure C/C composites, but wettability of molten glass on C/C composites clearly improved by surface coating modification. Cr3C2 and Cr-Si-C coatings have a better wettability with glass than SiC coating. Cr-Si-C coating shows the best wettability with barium-aluminium-silicate glass, and the contact angle between them can be reduced to only 10° at 1673 K. The effects of test temperatures of sessile drop, coating surface condition and coating dissolution on wettability between glass and coated C/C composites were discussed.Document Type:
DOI: 10.1179/026708410X12459349720051
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