Cold spray is one of the many names for describing solid-state coating process that uses a highspeed gas jet to accelerate powder particles toward a substrate to form a coating or deposit. The term "cold spray" refers to the relatively low process temperature involved in the process, which is typically much lower than the melting point of the spray material. Although the concept of cold spraying metal powders onto substrates goes back to the early 1900s, it was not until the 1980s that the applicability of this technology was demonstrated and patented by the Institute of Theoretical and Applied Mechanics of the Academy of Sciences in Novosibirisk (high-pressure cold spray) and then by the Obninsk Center for Powder Spraying (OCPS) (low-pressure cold spray) in the former Soviet Union.
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