Abstract
This article discusses the influence of the thickness of a nano-structured wear-resistant layer of the Ti–TiN–(Ti,Al,Si)N multilayer composite coating on its mechanical and performance properties. The study was focused on the coatings with the following thicknesses of its wear-resistant layers: 2, 3.5, 5, 7, 11, and 15 μm. The relation between the thickness of a wear-resistant layer and the time of its deposition was investigated, and the effect of the above thickness on hardness and wear resistance in scratch testing was considered. Cutting tests were conducted in turning steel C45 with carbide inserts with the coatings under study at various cutting speeds (vc = 250, 300 and 350 m/min). The study found the value of thickness of wear-resistant layer providing the longest tool life at various cutting speeds. The differences in the nature of wear for the coatings with various thicknesses of wear-resistant layers were considered.
Highlights
The challenge to choose the optimal thickness for coatings of different compositions is considered in several studies devoted to the investigation of the properties of physical vapor deposition (PVD)coatings
Cutters with cemented carbide SNUN ISO 1832:2012 [51] inserts were used as cutting tools
The coating is characterized by sufficient plasticity, since delamination and longitudinal
Summary
The challenge to choose the optimal thickness for coatings of different compositions is considered in several studies devoted to the investigation of the properties of physical vapor deposition (PVD). In Reference [1], Klocke et al found that the coating with the maximum thickness provided the longest metal-cutting tool life. It is indicated that, at the deposition of a single layer of coating, the grains increase with an increase in the thickness of the coating [2]. This fact is related to the mobility of adatoms (adsorbed atoms) during the deposition of a coating, since the deposited coating becomes gradually insulating. The adatoms move around the surface until they find a potential “crater” for embedding, usually a defect or a position near the steps of a growing crystal on the surface (Figure 1) [3]
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