Fig. 1. Schematic of friction and wear test

Fig. 2. XRD test results of coatings

Fig. 3. Micro-morphologies of coating 1. (a) OM image; (b) SEM image of central region of coating; (c) partially enlarged view of Fig.3 (b); (d) SEM image of bottom region of coating; (e) partially enlarged view of Fig. 3(d)

Fig. 4. Micro-morphologies of coating 2. (a) OM image; (b) SEM image of central region of coating;(c) partially enlarged view of Fig. 4(b)

Fig. 5. Microhardness of coatings

Fig. 6. Friction and wear test results. (a) Friction coefficient; (b) weight loss

Fig. 7. Worn surface profiles

Fig. 8. SEM morphologies of coatings after dry sliding friction and wear. (a) Coating 1; (b) coating 2