Abstract:

Cold spray (CS) is a solid-state deposition process in which solid powders are accelerated towards the substrate via a converging/diverging nozzle. Coating deposition occurs without melting the sprayed particles. Spray particles adhere to the substrate on impact because of their high kinetic energy. For successful bonding, powder particles have to exceed a critical velocity on impact, which is dependent on the properties of the particular spray material. Different materials such as metals, ceramics, composites and polymers can be deposited using CS. CS is a novel and promising technology to obtain surface coating, offering several technological advantages over thermal spray since it utilizes kinetic energy rather than thermal energy for deposition. As a result, residual stresses, oxidation and undesired chemical reactions can be avoided. Cold spray technology has many applications in the industry. It has been developed for the protection and repair of components used in many industries. In recent years, cold spray process has been used in application fields such as repair of electronic systems, additive manufacturing, welding, brazing, surface protection, medical devices, and medical materials. This study summarizes the cold spray process by briefly reviewing the historical development, basic principles and features, adhesion mechanism and application areas of the cold spray process.

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