4. Conclusion

Figure 22. Outer corner wear of 6-mm diameter WC–co drills as a function of the number of holes drilled. Cutting speed: 100 m/min (5304 rpm), feed rate: 0.18 mm/rev. Workpiece: Carbon steel (S50C). Cutting fluid: Water soluble agent. Hole

Figure 23. SEM images of the outer corner of worn areas of (a) TiAlN, (b) multilayer TiAlSiN, and (c) multilayer

TiAlCrSiN coated 6 mm diameter WC–co drills after 1000-hole drilling test.

depth 30 mm (5diameter).

96 Lubrication - Tribology, Lubricants and Additives

TiAlN monolayer, TiAlN/SiNx, TiAlN/CNx, TiAlSiN, and TiAlCrSiN multilayer coatings were deposited on WC–Co carbide tools and silicon wafer substrates by reactive magnetron sputtering. We show that the multilayer structure affects the surface morphology, microstructure, mechanical, and tribological properties.


4. The tribological properties of the multilayer TiAlCrSiN-base coatings make these coatings effective at resisting wear and improved the cutting tool performance under wet conditions. The multilayer TiAlCrSiN coated drills outperformed the single layer TiAlN and multilayer TiAlSiN coated drills, which might be attributed to the multilayered structure of the TiAlCrSiN coating and to the improved tribological properties of the multilayer TiAlCrSiN coating owing to the incorporation Cr. The influence of the latter on cutting tool performance of the TiAlCrSiN coatings requires further investigation and will form part of our ongoing research into PVD coatings for dry machining in the automobile and aerospace industries.

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Surface Morphology and Tribological Properties of Nanoscale (Ti, Al, Si, C)N Multilayer Coatings Deposited by…

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