DEPOSITION AND MECHANICAL-PROPERTIES OF MULTILAYERED PVD TI-TIN COATINGS

This work aims at the development of multilayered coatings with increa sed fracture resistance, retained hardness and adhesion (compared with current state-of-the-art coatings) to the substrate. One way of obtai ning this effect is to deposit multilayered coatings consisting of alt ernating thin layers of hard and softer, more ductile materials. A mod ified commercial PVD deposition process was used for deposition of mul tilayered Ti-TiN coatings on both high speed steel (HSS) and cemented carbide (CC) substrates in order to explore this. The multilayer coati ngs were evaluated with respect to fundamental properties such as morp hology, microstructure, hardness, adhesion and fracture resistance. Th e deposition process was found to yield well-adhered coatings with an increased fracture resistance due to the multilayered structure, on bo th HSS and CC substrates.