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Coatings 2018, 8(5), 158; https://doi.org/10.3390/coatings8050158

Study on Modified Water Glass Used in High Temperature Protective Glass Coating for Ti-6Al-4V Titanium Alloy

1
College of Materials Science and Engineering, Sichuan University, Chengdu 610064, China
2
Southwest Institute of Technical Physics, Chengdu 610041, China
*
Author to whom correspondence should be addressed.
Received: 27 February 2018 / Revised: 3 April 2018 / Accepted: 19 April 2018 / Published: 26 April 2018
(This article belongs to the Special Issue Coatings for Dies and Molds)
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Abstract

Sodium silicate water glass was modified with sodium polyacrylate as the binder, the composite slurry used for high-temperature oxidation-resistant coating was prepared by mixing glass powder with good lubrication properties in the binder. The properties of the modified binder and high-temperature oxidation resistance of Ti-6Al-4V titanium alloy coated with composite glass coating were studied by XRD, SEM, EDS, TG-DSC and so on. Results showed that sodium polyacrylate modified water glass could obviously improve the suspension stability of the binder, the pyrolytic carbon in the binder at high temperature could increase the surface tension in the molten glass system, and the composite glass coating could be smooth and dense after heating. Pyrolytic carbon diffused and combined with oxygen in the coating under the heating process to protect the titanium alloy from oxidation. The thickness of the oxide layer was reduced 51% after applying the high-temperature oxidation-resistant coating. The coating also showed a nearly 30% reduction in friction coefficient due to the boundary lubricant regime. During cooling, the coating could be peeled off easily because of the mismatched CTE between the coating and substrate. View Full-Text
Keywords: sodium silicate water glass; sodium polyacrylate; titanium alloy; coating; oxidation resistant; lubricant sodium silicate water glass; sodium polyacrylate; titanium alloy; coating; oxidation resistant; lubricant
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Yang, S.; Zhou, D.; Zhou, J.; Yang, L.; Fan, Q.; Yao, Q.; Yang, Y. Study on Modified Water Glass Used in High Temperature Protective Glass Coating for Ti-6Al-4V Titanium Alloy. Coatings 2018, 8, 158.

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