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Cold Spray
Cold Spray processing (or simply Cold Spray) is a high-rate material deposition process in which small powder particles in solid state ("unmelted" -- typically 1 - 50 microns in diameter) are mixed with heated gas (helium, nitrogen, or air) in the range of 20 to 700 C and accelerated to supersonic velocities on the order of 600 - 1000 m/s through a de Lavell nozzle. The particles impact the target surface with sufficient kinetic energy to cause plastic deformation and consolidation with the underlying material to bond together, rapidly building up a layer of deposited material. The process is thought to be analogous to explosive welding.
Rick Blose |
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