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This chapter reviews the current understanding of high-pressure cold spraying for different materials, covering widely accepted general mechanisms for particle deposition and the processes and parameters involved. It begins by reviewing the mechanisms of bonding. An overview of the optimization of the critical process parameters for improving coating qualities is then provided. This is followed by a separate section dealing with bonding between different materials and addressing influences on adhesion to the substrate as well as the cohesion between dissimilar coating constituents. The knowledge of the basic science and mechanisms finally allows for discussion on the requirements for suitable cold spray equipment and of the parameter sets needed for successful coating deposition.

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