Fabrication and characterization of Ni-Coated Graphite/Al–Zn coatings by cold spraying

Abstract

This work focus on the influence of Ni-Coated Graphite contents on microstructure and properties of Al-Zn composite coatings. The morphology and composition of the coatings were analysed by SEM and EDS. The result showed that the coating is dense, the composition is uniform, and there is no phase change. The bonding mechanism between coating particles and between coating and substrate was also analysed. The hardness and wear resistance of the four coatings were tested. It was found that the addition of Ni-Coated Graphite improves the hardness and wear resistance of the coating. In general, the addition of 20% Ni-Coated Graphite powder is the best for Al-Zn composite coatings with low porosity.

Investigation on Microstructure and Properties of Cold-Sprayed Ni-Mo-Al2O3 Composite Coating

“…During the deposition process, Ni is more prone to severe plastic deformation and adiabatic shear instability. In addition, the excellent viscosity of Ni is also conducive to the deposition of other components on Ni to form a multi-component composite coating based on Ni [19]. As can be seen in Figure 3d-f, the coating has good adhesion with the base material, and the internal composition of the layer is uniform.…”