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Open AccessArticle

Deposition of Titanium Dioxide Coating by the Cold-Spray Process on Annealed Stainless Steel Substrate

1
Department of Mechanical Engineering, Toyohashi University of Technology,1-1, Tempaku-Cho, Toyohashi, Aichi 441-8580, Japan
2
Faculty of Mechanical Engineering and Manufacturing Technology, Technical University of Malacca, Durian Tunggal, Melaka 76100, Malaysia
*
Author to whom correspondence should be addressed.
Coatings 2020, 10(10), 991; https://doi.org/10.3390/coatings10100991
Received: 18 September 2020 / Revised: 15 October 2020 / Accepted: 15 October 2020 / Published: 17 October 2020
(This article belongs to the Special Issue Functional Ceramic Coatings)
The surface of most metals is covered with thin native oxide films. It has generally been believed that to achieve bonding, the oxide covering the surface of metallic particles or metal substrates must be broken and removed by adiabatic shear instability (ASI), whether induced at the particle–substrate interface or at the particle–particle interface. The aim of the present research is to investigate the correlation between the remaining oxide amorphous layer and substrate-deformation with the adhesion strength of cold-sprayed TiO2 coatings towards the bonding mechanism involved. Relevant experiments were executed using stainless steel (SUS 304), subjected to various annealing temperatures and cold-sprayed with TiO2 powder. The results indicate an increasing trend of coating adhesion strength with increasing annealed substrate temperature. The influence of substrate plastic deformation and atomic intermixing at the remaining amorphous oxide layer is discussed as the factors contributing to the increasing adhesion strength of cold-sprayed TiO2 coatings. View Full-Text
Keywords: adiabatic shear instability (ASI); cold spray; titanium dioxide; bonding mechanism; adhesion strength; substrate deformation; amorphous interface layer adiabatic shear instability (ASI); cold spray; titanium dioxide; bonding mechanism; adhesion strength; substrate deformation; amorphous interface layer
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MDPI and ACS Style

Omar, N.; Selvami, S.; Kaisho, M.; Yamada, M.; Yasui, T.; Fukumoto, M. Deposition of Titanium Dioxide Coating by the Cold-Spray Process on Annealed Stainless Steel Substrate. Coatings 2020, 10, 991.

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