**4. Conclusion**

**Figure 8.** The morphology of wear track in TiN film and wear scar in upper zirconia ball after friction tests under the

**Figure 7.** Morphology of wear track in TiN film and wear scar in upper silicon nitride ball after friction tests under the

starve lubrication regime.

starve lubrication regime.

108 Lubrication - Tribology, Lubricants and Additives

One thick TiN film was prepared by ion-plated technology on the grit-blasted steel substrate. The tribological performance was evaluated with four upper balls made up of different materials under the starved lubrication regime. Compared with their higher friction coefficients for grit-blasting steel against different balls, the friction coefficients for TiN films on the gritblasting steel were lower and steady. It was due to the hardness of TiN film and small contact area in the contact zone. During the sliding process, the strong load capacity of TiN films ensures the negligible wear rate, and the small contact area between of the friction pairs plays an important role in the steady friction coefficient.

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Effects of Different Materials on the Tribological Performance of PVD TiN Films under Starved…

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