Microstructure and Microhardness of Alumina-3wt. % Titania Coating Formed by a New Multi-Chamber Gas-Dynamic Accelerator

Abstract:

Alumina-titania coatings are widely used in industry for wear, abrasion or corrosion protection components. This paper presents the results of the investigation of the structure and microhardness of the alumina-titania (Al₂O₃:Ti wt ratio = 97:3) coating was prepared by a new multi-chamber gas-dynamic accelerator on corrosion-resistant steel substrate. Morphology of the powder particles, microstructure and phase composition of the coating were characterized with the use of scanning electron microscopy, X-ray phase analysis and Vickers hardness tester at a test load 0.2 kg. The results show that the microstructure of the alumina–3wt.% titania coating consists of region with different degrees of melting: the lamella built up from the fully melted particles of the powder, and partially melted regions. The developed coating by this method is highly dense (porosity of less than 0.2%) and tightly adherent.

• Periodical: Applied Mechanics and Materials (Volume 851)
• Pages: 3-7
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.851.3
• Online since: August 2016
• Authors: Marina G. Kovaleva*, M.S. Prozorova, M.Yu. Arseenko, V.Yu. Novikov, V.V. Sirota
• Keywords: Alumina-Titania Coating, Hardness, Microstructure, Multi-Chamber Gas-Dynamic Accelerator

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