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Indexed by:期刊论文

Date of Publication:2012-11-01

Journal:POWDER TECHNOLOGY

Included Journals:SCIE、EI、Scopus

Volume:230

Page Number:134-138

ISSN No.:0032-5910

Key Words:Titanium alloy; Glass-ceramic coating; Sodium polyacrylate/sodium silicate binder; Oxidation resistance

Abstract:A sodium polyacrylate/sodium silicate binder used in oxidation resistant coating was investigated, and its effect on oxidation behavior of titanium alloy was studied at 800 degrees C in air. Glass-ceramic coating slurry mixed with the binder had good dispersity and stability. The coating was deposited on Ti-6Al-4V titanium alloy through the slurry-dipping method. Better oxidation resistance was obtained at an elevated temperature, and the thickness of the alpha-case layer was reduced by 71%. The microstructure of the binder consisted of spherical molecules, large molecules, and a stick organization. The phase was composed of several crystalline phases and an amorphous phase. At a temperature range of 100 degrees C to 1200 degrees C. the total weight loss was 28.3%. A stable state could be obtained at above 700 degrees C, which ensured a perfect barrier for protecting the alloy from oxidation. During cooling, the coating can be peeled off easily because of the mismatched coefficient of thermal expansion between the glass and substrate, and the carbon oxidation of the binder. (C) 2012 Elsevier By. All rights reserved.