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In the present paper, prediction of the coating fatigue behaviour of coated cylindrical specimens during the ball-on-rod rolling contact fatigue (RCF) test is introduced. The prediction is based on a non-linear finite element method (FEM) simulation, considering analytically the experimentally determined coating fatigue properties. During the RCF test, coated rods are subjected to rolling contact...
Sand particle erosion remains a crucial problem in aeronautical engines. Blades are made out of titanium alloy known for its poor erosion resistance. To protect these pieces, tungsten-based multilayer coatings deposited by magnetron sputtering were developed. They were tested on a specific erosion rig. Tests allowed to choose deposition parameters leading to extremely resistant films. Impact tests...
Thin hard physical vapour deposition (PVD) coatings attribute excellent cutting performance to cemented carbide inserts, allowing a beneficial exploitation of modern CNC machine tools. Based on the continuous chip formation, coatings experience distinct failure mechanisms in turning. To clarify the influencing parameters on coating wear resistance release, turning experiments with TiAlN derived coatings,...
Multi-layers resulting from the combination of layers of different PVD nitrides (TiN, Ti 2 N, Ti(C,N), (Ti,Al)N) were deposited by arc evaporation on AISI M2 tool steel and their tribological behaviour has been investigated. The effect of a MoS 2 layer deposited on top of the PVD nitride multi-layers was also studied. Dry sliding and abrasive wear behaviour have been studied by a slider-on-cylinder...
Physical vapour deposited (PVD) coatings are often exposed to high temperatures in service, for example, in cutting tool applications, yet laboratory testing of such coatings is usually performed at room temperature. In this work two tribological test methods were used to rank the performance at room temperature and at 350°C in air of four PVD coatings (two TiN coatings of different thickness, TiCN...
A series of macroparticle-free TiN, TiC x N (1-x) and TiC coatings were deposited on 316 austenitic stainless steel using a titanium target in a filtered arc deposition system (FADS) and reactive mixtures of N 2 and/or CH 4 gases. The surface topography, chemical composition and microstructure of these coatings were characterised by optical microscopy...
In this paper, a physical vapour deposited (PVD) deposited TiB 2 coating is compared in dry sliding with commercial PVD titanium nitride (TiN), titanium aluminium nitride (TiAlN) and titanium carbonitirde (TiCN) as to frictional properties and tendency of counter material pick-up. The aim is to investigate if the superior behaviour of the TiB 2 coating experienced in severe sliding...
The corrosion–erosion resistance of TiN-coated AISI 304 and AISI 420 stainless steels in aqueous slurries was studied. TiN films with a thickness of 0.6μm were obtained by using the pulsed-arc plasma-assisted physical vapour deposition technique. The corrosion–erosion experiments were performed in a test machine in which the impingement velocity, impact angle, concentration of solids and pH of the...
The main goal of the work presented in this paper is to enable the use of biodegradable, additive-free lubricants for metal forming and cutting processes. Deficiencies in the tribological performance of these alternative cutting and forming lubricants shall be compensated for by the application of newly developed PVD tool coatings. In doing so, some of the functions that the lubricant used to perform,...
The aim of the present work was to investigate and compare different hard coatings as to the tendency for work material adhesion and galling properties when applied on forming tool steel and sliding against different work materials. The surface coatings included were PVD deposited TiN, TiB 2 , VN, TaC and DLC coatings. They were all applied to cold work tool steel. Tribological evaluation...
In the present work, the friction and wear behaviour of the AM60Mg-alloy (nominal chemical composition: Mg–6% Al–0.3% Mn; hardness: 52HV) dry sliding against coated AISI M2 high-speed steel has been investigated. Different coatings were deposited on the high-speed steel by means of the PVD technique: three hard coatings (TiN, CrN and ZrN) and two self-lubricating coatings (MoS 2 and WC/C)...
In this work, the tribological properties of tool coatings applied by physical vapour deposition are studied. A first aspect is the resistance to galling and abrasive wear, which are investigated by means of a flat/cylindrical multifrottement test. The observations for the evolution of the friction coefficient discriminate the various coatings as regards the onset of galling. In addition, topographic...
PVD coatings are of great interest due to their high hardness, wear and oxidation resistance, thermal stability and lubricity. Gradient deposition technology allows improving adhesion to substrate and mechanical properties of the coating-substrate system by elimination of the mismatch in materials properties at the interface and reduction of residual stresses. The present study aims at the assessment...
Within the frame of this work, low temperature Ti–Si–C films were deposited on high-speed steel and stainless steel substrates by combined dc/rf magnetron co-sputtering. Composition analysis revealed the existence of two distinct regions: (i) a silicon doped sub-stoichiometric titanium carbide zone and (ii) a titanium rich zone. Structural analysis confirmed the different nature of the prepared films...
This study focuses on the influence of surface geometry of hard coatings on tribological behavior. TiN, TiAlN, AlTiN and nanocomposite (nc-Ti 1−x Al x N)/(a-Si 3 N 4 ) (nACo) coatings were deposited by means of the lateral rotating cathode arc method on high speed steel (HSS) substrates. Surface topology (area of 50μm×50μm, 10μm×10μm and 5μm×5μm) investigations by the...
Application of MoS 2 -based solid lubricant has extreme potential as a coating material of cutting tools because of its superlubricity against most of the engineering materials. However, a detailed study on the effect of such lubricious coating in grinding has never been carried out before. In the present research, the tribological behaviour of MoS 2 -Ti composite coating with TiN...
In the present investigation, the wear resistance of tools for the precision stamping of a mechanical part for the automotive industry is optimised. The investigation is divided into two stages. In the first one, the progression of damage in the punches and dies is assessed. Wear mechanisms are evaluated by means of observations and measurements in a scanning electron microscope (SEM). In the second...
Titanium (Ti) coatings are widely used in biomedical engineering, microelectronics and thin film industry. However, very little is known about its tribological behaviour under dynamic contact conditions. In the light of this, the present work attempts to explore the tribological properties of a micrometer thick Ti coating deposited on a D9 steel substrate. Frictional tests were carried out using a...
The performed experiments revealed that the anti-wear resistance of chromium nitride and chromium carbonitride multilayer coatings obtained by the PVD method was higher than each of the phases separately.The CrN/CrCN coatings were obtained using cathodic arc evaporation. They consisted of seven modules, each approximately 400nm thick, characterised by different thickness ratio of the CrN and CrCN...
The aim of the present investigation was to examine the possibility of reducing lubrication and replacing expensive tungsten carbide material in blanking/piercing through introduction of hard tool coatings. Results show that hard PVD coatings can be successfully used in blanking/piercing applications, even on softer tool steels, thus leading to reduced friction and wear as well as to lower costs of...
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