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Nanocrystalline Copper Coatings Produced by Cold Spraying
Jingchun Liu,Hua Cui,Xianglin Zhou,Jishan Zhang,Xiangkun Wu 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.1
Copper powder was cryomilled for 12 hours to achieve particle size in the range of 2 µm to 25 µm, which powder was subsequently used as feedstock for the deposition of nanocrystalline (nc) Cu coating via cold spraying. The as-milled copper powder was characterized by X-ray diffraction (XRD), scanning electron micros-copy (SEM) and high resolution transmission electron microscopy (HRTEM). The particle size of the cryomilled Cu powder was detected by laser scattering. The microstructure of the coating was analyzed using SEM and scanning transmission electron microscopy (STEM). The XRD and HRTEM analysis showed that the grain size of the cryomilled Cu powder was about 5 to 40 nm. This nanoscale structure was retained after the cold spraying. The nanoindentation analysis showed that the nc Cu coating hardness value reached 3.3GPa, which was higher than that of its coarse grained counterpart.