Abstract
Cold gas dynamic spraying (CGDS) is a relatively new technology of cold spraying techniques that uses converging-diverging (De Laval) nozzle at a supersonic velocity to accelerate different solid powders towards a substrate where it plastically deforms on the substrate. This deformation results in adhesion to the surface. Several materials with viable deposition capability have been processed through cold spraying, including metals, ceramics, composite materials, and polymers, thereby creating a wide range of opportunities towards harnessing various properties. CGDS is one of the innovative cold spraying processes with fast-growing scientific interests and industrial applications in the field of aerospace, automotive and biotechnology, over the past years. Cold gas spraying with a wide range of materials offers corrosion protection and results in increases in mechanical durability and wear resistance. It creates components with different thermal and electrical conductivities than that substrates would yield, or produces coatings on the substrate components as thermal insulators and high fatigue-strength coatings, and for clearance control, restoration and repairing, or prostheses with improved wear, and produces components with attractive appearances. This review extensively exploits the latest developments in the experimental analysis of CGDS processes. Cold gas dynamic spraying system, coating formation and deposit development, description of process parameter and principles, are summarized. Industrial applications and prospectives of CGDS in future research are also commented.
Highlights
Cold gas dynamic spraying (CGDS), is one of the embracing powder deposition spraying processes
This review provides a comprehensive and reliable baseline for the choice of process parameters used during CGDS
The cold dynamic spraying (CGDS) method, apart from evolving as one of the embracing powder deposition spraying processeses with a notable research finding including the basic evolutions introduced in Russia by the institute for theoretical and applied mechanics in 1980s, has significantly grown over the years and with the integration of De Laval nozzle as an innovative contrivance
Summary
Cold gas dynamic spraying (CGDS), is one of the embracing powder deposition spraying processes. Such advantages are: ability to protect materials against corrosion, increase wear resistance and mechanical durability, create components with different thermal and electrical conductivities than substrate would yield, or producing coatings on the substrate components as thermal insulators, high fatigue strength coating, prohibiting creep in an environment with high temperature, clearance control, restoration and repair, prostheses with improved wear, and produce components with attractive appearance [14,15,16,17] These make cold spraying processes industrially commercialized because of its wide range of applications in aerospace- repair of solid rocket boosters space shuttle, aircraft industry, gas turbine, petrochemicals, electronics, bioengineering, casting, oil and gas, automotive industry, etc.
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