Film thickness effect on mechanical properties and milling performance of nano-structured multilayer PVD coated tools

A Critical Review of Measures for an Effective Application of Nano-Structured Coatings in Milling

“…The deposition of multilayer nano-structured PVD coatings on cemented carbide tools contributes to a significant improvement of the coated tool life due to their capability to prevent the crack propagation [7]. Characteristic SEM photos demonstrating cross sections of nanolayered HPPMS PVD TiAlN coatings with film thickness of approximately 2 μm and 8 μm are shown in Fig.…”

“…The annealing duration was adequately varied. To estimate the strength properties of the ADLs of the manufactured PVD films, nanoindentations coupled with appropriate FEM simulations were carried out on annealed coated specimens [7].…”

“…The R-rate was calculated at constant VB growth steps of 30 μm. The related numbers of cuts at the beginning and at the end of these steps were estimated by conducting milling experiments [7]. In the considered milling case, the undeformed chip length lcu amounted to 16 mm.…”

“…The effectiveness of the adhesive nano-interlayers depends on the substrate surface's integrity and on the layer material [3,4]. Moreover, nano multi-layer PVD structures has to be applied for restricting the film brittleness [7,8]. Furthermore, diamond coatings deposited on cemented carbide tools are characterized by high residual stresses in their structure mainly due to epitaxial crystal differences and thermal expansion coefficients mismatch of the diamond coating and its cemented-carbide substrate [9][10][11].…”

Multilayer composition coatings for cutting tools: formation and performance properties

“…Cutting tools with functional coatings are increasingly used in industry, since they solve a range of complex tasks to improve the productivity of production processes of machining; however, they remain the weak component in the technological process of cutting and limits its development [1][2][3][4][5][6]. In this context, the challenge to improve compositions and structures of wear-resistant coatings for cutting tools, methods and technologies of their production is relevant and aimed at further improvement of the efficiency of machining.…”