New Advances in High and Low Temperature Spray Processes for Functional Metallic Coatings

Dear Colleagues,

Spray processes for metallic materials have been successfully used for many years to solve and address problems in industry. The vast majority of methods are based on the melting temperature of the feedstock material in order to form a coating layer (such as in the plasma spray of HVOF). Much has been achieved using this strategy academically, as well as industrially with applications in several key sectors (aerospace, automotive, oil, and gas are tangible examples). Other methodologies (such as cold spray) are, by definition, not crossing the melting point of materials. On paper, these are younger methods, which have attracted a relatively large academic population for their development, and are in progress for large scale industrial application. Overall, we have witnessed research work on this topic in several key areas, such as material development, process development, equipment design, and fundamental studies. However, some key issues remain. For example, in high temperature spray thermal distortion, coating oxidation and phases control are not comprehensively solved; while in lower temperature spray, the substrate bond-strength, coating density, and deposition efficiency (related to process cost) have so far been difficult hurdles to overcome.

The interest of this Special Issue is to collect new advances that are promising for solving the major key issues of the past and the present. These could be material, equipment, or process related. We are looking to receive ground-breaking contributions in order to gather compelling evidence of how metallic spray processes are likely to be re-shaped within the next 10–15 years.

Prof. Dr. Rocco Lupoi
Prof. Dr. Shuo Yin
Prof. Dr. Guanjun Yang
Guest Editors

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• Cold spray
• Plasma spray
• Thermal spray
• PS-PVD
• PS-CVD
• Nozzle design
• Microstructure 
• New materials
• Equipment development
• Parameters development
• Material characterization
• Coating performance
• Coating properties
• Coating bond strength