Fig. 1. Morphologies of original powders. (a) Cu powder; (b) CNTs powder

Fig. 2. Schematic diagram of electroless plating of Ni and Cu on CNTs powder

Fig. 3. Morphology of Ni-Cu-CNTs powder. (a) Overall morphology; (b) EDS elemental analysis

Fig. 4. Morphology of Ni-Cu-CNTs/Cu composite powder after ball milling

Fig. 5. Cross-sectional microstructures of Ni-Cu-CNTs/Cu composite coatings prepared by laser-assisted low pressure cold spray. (a) (b) Mass fraction of 5% Ni-Cu-CNTs; (c) (d) mass fraction of 10% Ni-Cu-CNTs

Fig. 6. Morphology and elemental analysis of Ni-Cu-CNTs in composite coating. (a) Micromorphology; (b) EDS composition analysis

Fig. 7. Friction coefficient of Ni-Cu-CNTs/Cu composite coatings prepared by laser-assisted low pressure cold spray

Fig. 8. 3D profiles of wear scars. (a) Pure Cu coating; (b) mass fraction of 5% Ni-Cu-CNTs; (c) mass fraction of 10% Ni-Cu-CNTs

Fig. 9. Abrasion resistance of coating. (a) Track size; (b) wear rate

Fig. 10. Morphology and EDS analysis of wear scar of Ni-Cu-CNTs/Cu composite coatings prepared by laser-assisted low pressure cold spray. (a) (b) Mass fraction of 5% Ni-Cu-CNTs; (c) (d) mass fraction of 10% Ni-Cu-CNTs