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Coating as Micro-Structural System

The paper provides the application of nanostructured TiAlN and nanocomposite structured TiAlSiN coatings on step drills. The analyses proved that the obtained tool lives are different despite the fact that the same tool geometry, coating, and PVD (physical vapour deposition) technology are used. This disproportion was experimentally tested focusing on surface condition using the pre and post treatment and on the chemical and structural coating composition.