Fig. 1 shows the wear scar morphology of the two composite coatings. Comparing Fig. 1a and b, it can be seen that the Ti-SiC(ht) Fig. 1. Wear scar morphology of two system coatings: (a) Ti-SiC, (b) Ti-SiC(ht), (c) (e) high magnification of (a) and (d) (f) high magnification of (b).Y.-d. Ma, et al. coating had narrower and shallower wear scars. Once again proved that Ti-SiC(ht) coating had higher wear resistance. As can be seen from Fig. 1c and e, there were obvious grooves (A) and spalling pits (B) on the wear scar surface of the Ti-SiC coating. Both the coating and the grinding ball were ceramic, and the abrasive debris generated during the wear process was sandwiched between the coating and the grinding ball, which was squeezed and slipped under the action of the normal load, thus created the grooves on the surface of the coating. As can be seen from Fig. 1d, no obvious grooves were observed in the Ti-SiC(ht) coating. It can be seen from Fig. 1f that shallow grooves (C) appeared on the surface of the wear scar, and there were grinding chips (D) attached. This may be because the hardness of the Ti-SiC(ht) coating was larger, and the abrasive chips were not easy to leave obvious furrows on the surface of the harder coating. However, the grinding debris attached to the grinding marks could form finer particles after repeated extrusion and fall to the rough area. These abrasive debris dropped in the rough area could alleviate the contact stress concentration and reduce the damage of the stress to the coating. Therefore, the comprehensive comparison shows that Ti-SiC(ht) coating had better wear resistance than Ti-SiC coating.
Fig. 1. Wear scar morphology of two system coatings: (a) Ti-SiC, (b) Ti-SiC(ht), (c) (e) high magnification of (a) and (d) (f) high magnification of (b).
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