Processing Conditions Affecting Grain Size and Mechanical Properties in Nanocomposites Produced via Cold Spray

摘要: Cold spray is a coating technology based on aerodynamics and high-speed impact dynamics. In this process, particles (usually 1-50 μm in diameter) are accelerated to high velocity (typically 300-1200 m/s) by gas (pre-heated air, nitrogen, or helium) flow that generated through convergent-divergent de Laval-type nozzle. A formed the intensive plastic deformation of impacting substrate at temperature below melting point material. present paper main processing parameters affecting microstructural mechanical behavior metal-metal cold deposits described. The effect process grain refinement properties were analyzed for composite Al-Al2O3, Ni-BN, Cu-Al2O3, Co-SiC. nanocomposites compared with those parent materials sprayed under same conditions. conditions, leading strong an acceptable level deposit such as porosity adhesion strength, discussed.