Ni-Ti Shape Memory Alloy Coatings for Structural Applications: Optimization of HVOF Spraying Parameters

This work aims at contributing to the development of a revolutionary technology based on shape memory alloy (SMA) coatings deposited on-site to large-scale metallic structural elements, which operate in extreme environmental conditions, such as steel bridges and buildings. The proposed technology wi...

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Bibliographic Details
Published in:Advances in materials science and engineering 2018-01, Vol.2018 (2018), p.1-10
Main Authors: Matikas, Theodore E., Dassios, Konstantinos G., Dalla, Panagiota T., Baxevanis, Theocharis, Chianese, Simeone, Musmarra, Dino, Karatza, Despina, De Crescenzo, Carmen, Exarchos, Dimitrios A.
Format: Article
Language:English
Subjects:
Alloys
Bond strength
Coating effects
Corrosion
Corrosion prevention
Feed rate
Flame spraying
Gases
High velocity oxyfuel spraying
Intermetallic compounds
Laboratories
Materials science
Mechanical properties
Microelectromechanical systems
Nickel titanides
Parameters
Protective coatings
Shape memory alloys
Sprayed coatings
Steel bridges
Stiffness
Structural members
Substrates
Thin films
Titanium
Velocity
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Summary:This work aims at contributing to the development of a revolutionary technology based on shape memory alloy (SMA) coatings deposited on-site to large-scale metallic structural elements, which operate in extreme environmental conditions, such as steel bridges and buildings. The proposed technology will contribute to improve the integrity of metallic civil structures, to alter and control their mechanical properties by external stimuli, to contribute to the stiffness and rigidity of an elastic metallic structure, to safely withstand the expected loading conditions, and to provide corrosion protection. To prove the feasibility of the concept, investigations were carried out by depositing commercial NiTinol Ni50.8Ti (at.%) powder, onto stainless steel substrates by using high-velocity oxygen-fuel thermal spray technology. While the NiTinol has been known since decades, this intermetallic alloy, as well as no other alloy, was ever used as the SMA-coating material. Due to the influence of dynamics of spraying and the impact energy of the powder particles on the properties of thermally sprayed coatings, the effects of the main spray parameters, namely, spray distance, fuel-to-oxygen feed rate ratio, and coating thickness, on the quality and properties of the coating, in terms of hardness, adhesion, roughness, and microstructure, were investigated.
ISSN:1687-8434
1687-8442
DOI:10.1155/2018/7867302