Structure and mechanical properties of PVD coatings for tool materials
L. A. Dobrzanski; A. Sliwa; L. W. Zukowska
Journal of Achievements in Materials and Manufacturing Engineering
Abstract
Purpose: The goal of this work is to investigate and compare the properties of (Ti, Al)N, Ti(C, N) and (Ti, Al, Si) N coatings, deposited on cemented carbide and cermet substrates. Design/methodology/approach: Coatings deposition were carried out using the PVD method by the cathodic arc evaporation (CAE) process. Investigations of surfaces and structures of the deposited coatings were carried out with use of SEM and TEM methods. Roughness parameter measurements, adhesion evaluation of the coatin...Moregs on the investigated inserts, the Vickers microhardness measurements and detailed cutting tests were carried out to compare the properties of the investigated materials. Findings: The results of the investigations carried out confirm the advantages of PVD coatings deposited onto both: cemented carbides and cermets, especially in case of (Ti, Al)N and (Ti, Al, Si)N coatings. Coatings deposited onto the investigated substrates are characterised by good adhesion, high microhardness, taking effect in very high increasing of wear resistance. Practical implications: Deposition of hard, thin, multicomponent coatings on materials surface by PVD method features one of the most intensely developed directions of improvement of the working properties of materials. Employment of introduced combinations of substrates and coatings make it possible to transit of machining of semi-products from roughing to semi-finishing or finishing in one setting. Originality/value: Coatings based on (Ti, Al)N, (Ti, Al, Si)N as well as Ti(C, N) were developed to provide better performance over titanium nitride since the incorporation of aluminum or carbon in TiN increased hardness, decreased coefficient of friction of the coatings. Tools with such coatings reveal a significant life extension in service compared to the uncoated tools or coated with simple coatings based on monolayers of nitrides or carbonitrides, improvement of the tribological contact conditions in the tool-chip-machined material contact zone, and protection of the tool edge from oxidation and extensive overheating.
keywords:Tool materials; Multicomponent coatings; PVD
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