[Abstract] A new spraying technology called Cold Gas Dynamics Spraying process (CGDS), is developed based on aerodynamics recent years. It uses a low temperature supersonic gas jet(typically below 600e) to accelerate unmelted solid powders overa critical velocity at which particles impacton the substrate, deform plastically and mechanically to form the coating. Comparing with thermal spraying processes, CGDS may minimize any changes of the micro-structure,such as over-heated, oxidation and grain growing-up. The principles, features, mechanisms and parameters of the CGDS were presented. The research processes on cold-sprayed nano-structured coatings were involved.
[Key words] CGDS; Processing parameter; Nanostructured coatings
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