Properties of Alumina-Titania Coating Formed by a New Multi-Chamber Gas-Dynamic Accelerator

Abstract:

Thermal-sprayed alumina–titania coatings (Al₂O₃:Ti wt ratio = 60:40) were prepared by a new multi-chamber gas-dynamic accelerator. The coatings were examined by using scanning electron microscopy, X-ray phase analysis and Vickers hardness tester at a test load 0.2 kg. The coating was well-adhered with corrosion-resistant steel substrate. The results show that the microstructure of the alumina–titania coatings consists of areas with different degrees of melting: the lamella built up from the fully melted particles of the powder, and partially melted areas. The developed coating is highly dense (porosity is less than 0.7%). Research results show that hardness of alumina–titania coatings (Al₂O₃:Ti wt ratio = 60:40) can achieve up to 655 HV_0.2 and the specific wear rate of alumina-titania coatings is 52.40∙10^-5 mm³ (m∙N)^-1.

• Periodical: Key Engineering Materials (Volume 753)
• Pages: 117-122
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.753.117
• Online since: August 2017
• Authors: M.G. Kovaleva*, Mayya S. Prozorova, M.Yu. Arseenko, Olga N. Vagina, Viacheslav V. Sirota
• Keywords: Alumina-Titania Coating, Hardness, Microstructure, Multi-Chamber Gas-Dynamic Accelerator

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