Influence of substrate pre-treatments on residual stresses and tribo-mechanical properties of TiAlN-based PVD coatings

Laser texturing of substrate of coated tools — Performance during machining and in adhesion tests

“…Tool manufacturers use hard particles for blasting the surface of the tools, claiming that the residual stresses are reduced and thus the tool lifespan is increased. The correlation between coating adhesiveness and residual stresses was studied by [29], who found a strong influence of not only the residual stresses of the multilayer and monolayer coatings but also the residual stresses of the substrate on the adhesiveness of the coatings. Harder substrates and higher compressive stresses improve adhesion.…”

Restrictions of stress measurements using the curvature method by thermally induced plastic deformation of silicon substrates

“…The errors in the calculation may become excessively large at high coating/substrate thickness ratios, or when the elastic constants of coating and substrate differ to a considerable extent [17,18]. In the case treated above, for example, the error resulting from the coating/ substrate thickness ratio of~1.1% and from the difference in elastic constants (Young's modulus of TiAlN~450 GPa [6], biaxial modulus of (100) Si~180 GPa [8]) is already 10-15% [17]. This can be assumed as a considerable error and the validity of Stoney's approach is thus questionable.…”

“…Frequently, they are deposited by physical vapor deposition, which typically generates residual stresses within the coatings [2,3]. These residual stresses influence the properties of coatings, and therefore their performance to a great extent [2,[4][5][6][7]. Compressive residual stresses for example hinder crack propagation, because they reduce harmful tensile stresses generated under mechanical or thermal loads [2].…”

Impact of fracture toughness on surface properties of PVD coated cold work tool steel

“…However, although also in the case of the most brittle nano-composite (Ti,Si)N coating substrate hardness was decisive for good adhesion [32,33] and indentation resistance [34], the best results were obtained when combining hardness above 64 HRc and high fracture toughness (Groups 1P, 2 and 2P). As shown in Fig.…”