Structure of monolayer coatings deposited by PVD techniques (original) (raw)

Comparison of the PVD coatings deposited onto hot work tool steel and brass substrates

2007

The aim of the research is the investigation of the structure and mechanical properties of monolayers CrN, TiN and multilayers TiN/TiAlN and Ti/TiAlN coatings deposited by PVD techniques onto the substrate from the X37CrMoV5-1 steel and CuZn40Pb2 brass. Design/methodology/approach: The microhardness tests were made on the dynamic ultra-microhardness tester. Tests of the coatings' adhesion to the substrate material were made using the scratch test. The wear and friction tests were performed on a standard pin-on-disc device. Findings: The monolayer PVD coatings deposited onto hot work steel and brass substrate demonstrate the high hardness, adhesion and wear resistance. The critical load L C2 , which is in the range 32-60 N, depends on the coating and substrate type. The friction coefficient for the investigated coatings is within the range of 0.33-0.75. Practical implications: The investigation results will provide useful information to applying the PVD coating for the improvement of mechanical properties of the hot work tool steels and brass substrates. Originality/value: It should be stressed that the mechanical properties of the PVD coatings obtained in this work are very encouraging and therefore their application for products manufactured at mass scale is possible in all cases where reliable, very hard and abrasion resistant coatings, deposited onto tools steel and brass substrate are needed.

A Study of PVD Mono-And Multicomponent Thin Coatings for Tools Applications

2013

Two types of coatings a monoand a multi-component were deposited by Arc-PVD method to steel substrate made of machined steel (Cr-Mo-V) produced by powder metallurgy (PM). We used fractographic analysis employing an SEM technique with EDS to evaluate morphology of fractures across monoand multi-component system coatings. The surface of fractures was examined macroscopically and microscopically. Nanoindentation measurements with dynamic loading were carried out on deposited layers of TiN and AlTiCrN type in order to verify their deformation behaviour. The nanoindentation measurements revealed higher surface hardness of the layer AlTiCrN (47.7 GPa) resulting from the presence of Cr and Al in its composition and the TiN layer exhibited somewhat lower hardness (26.1 GPa). With decreasing hardness the elastic modulus decreased proportionally and it was interesting that that despite lower hardness of the TiN layer the modulus of elasticity E of this coat was higher compared to the AlTiCrN ...

Hardness and scratch response of PVD multilayer coatings

2009

In the present investigation, novel Cr/CrN, CrN/CrAlN and Cr/CrN/CrAlN multilayered coatings thin films have been developed by dual RF magnetron sputtering. They consist of superposing Cr, CrN and CrAlN layers of 50-500nm thick, up to a total thickness of 0.45-1µm. These coatings were grown on AISI4140 steel samples. The mechanical properties of these coatings were studied by scratch-tests and nano-indentation measurements. The hardness of the films reaches 15.8 GPa for a Cr/CrN multilayered coating sputtered at a bias voltage of -900V. High peak load tests were used to estimate the film adhesion on steel substrates; critical loads (Lc2) of 11N showed weak adhesion properties of the film. Moreover, an inventory of the major scratch-tests failure modes was established, which were classified into plastic deformation and different forms of cracking, spallation and coating perforation events. No evidence of interfacial failure(s) of the sub-layers was observed after the adhesion and nan...

Comparison of the PVD coatings

2009

Purpose: of the paper was comparison of the structure, adhesion and wear resistance of the monolayers CrN and TiN PVD coatings deposited onto plasma nitrited X37CrMoV5-1 type hot work tool steel. Design/methodology/approach: Diffraction and thin film structue were tested with the use of the transmision electron microscopy. The surfaces' thopography and the structure of the PVD coatings were observed on the scanning electron microscopy.The evaluation of the adhesion of coatings to the substrate was made using the scratch test. The wear and friction tests were performed on a pin-on-disc device at the room temperature and at the temperature of 500°C. Findings: The best wear resistance in both conditions (20°C, 500°C temperature) demonstrate the TiN coating. These test results correspond with the very good adhesion of the coating to the substrate material and its high hardness. The critical load L c5 (coating total delamination) lies within the range 86-92 N, depending on the coating type. It was revealed that the coating damage mechanism in the scrtch test commences in all cases with the widespread coating at the edge of the scratch being made and next develops depending on the coating type and location of the originated defects. Practical implications: The good properties of the plasma nitriding and the PVD coatings make them suitable in various engineering and industrial applications. Originality/value: The duplex surfaces treatment of the hot work tool steel for tools made for work at the elevated temperature improves their abrasion wear resistance significantly, compared to coatings developed with the PVD process.

Surface density of growth defects in different PVD hard coatings prepared by sputtering

Vacuum, 2012

Growth defects are present in all PVD hard coatings. They have detrimental influence on their tribological properties (higher sticking of workpiece material, higher friction coefficient, worse corrosion resistance, higher gas permeation). In order to improve the tribological properties of PVD hard coatings it is important to minimize the concentration of growth defects. Conventional TiAlN single layer as well as AlTiN/TiN and TiAlN/CrN nanolayer coatings were deposited on cemented carbide, powder metallurgical high speed steel (ASP30) and cold work tool steel (D2) by magnetron sputtering in the CC800/7 and CC800/9 sinOx ML (CemeCon) deposition systems, respectively. The surface morphology of the coated substrates was examined by scanning electron microscope (FE-SEM) in combination with focused ion beam (FIB), and 3D stylus profilometer. By means of 3D-profilometry we performed several measurements and detailed analysis on a series of samples from the several hundred production batches. The influence of growth defects on GDOES (glow-discharge optical emission spectrometry) depth resolution and pitting corrosion was also studied.

THE MICROSTRUCTURE AND CHARACTERIZATION OF TiN COATINGS PREPARED BY PHYSICAL VAPOUR DEPOSITION (PVD

Transstellar Journals, 2019

Titanium nitride (TiN) possesses excellent property as corrosion resistance, aesthetic appear Titanium nitride (TiN) is being used for coating materials on SS, Mild steel. Since many techniques are there amongst, reactive DC magnetron sputtering has many advantages to deposit ceramic coatings using metallic targets. In the present work, our main aim is to improve the hardness of mild steel. The titanium of 2'' diameter and 3 mm thickness is used as a target (99.99 % purity) for the deposition of TiN coatings. The micro structural, mechanical and wear properties are investigated using

Corrosion resistance of multilayer coatings deposited by PVD techniques onto the brass substrate

Journal of Materials Processing Technology, 2005

The paper presents investigation results of the structure and corrosion resistance of the CuZn40Pb2 brass deposited by PVD process with the thin multilayer Ti/CrN, Ti/ZrN, Ti/TiAlN, TiAlN/Mo coatings. The corrosion tests were made in a 1 M HCl solution. It was found out that coatings deposited by PVD method on the brass substrate improve significantly its corrosion resistance. It has been demonstrated that the increase of the number of layers results in a significant increase of the corrosion resistance. The best results were obtained for the multilayer Ti/ZrN and Ti/CrN coatings.

Assessment of the mechanical and tribological performance of a ZrN PVD coating

Surface Engineering

The present work has been conducted in order to assess the mechanical and tribological performance of a ZrN coating deposited onto a H13 steel substrate by means of a closed field unbalanced magnetron-sputtering ion-plating (CFUMSIP) process. The hardness and elastic modulus of the coated system have been determined by means of nanoindentation techniques. Dry and wet sliding wear tests, employing a tribometer under a ball-on-disc configuration, were carried out making use of an alumina ball as counterpart, with an applied normal load of 2 N at a constant speed of 5 cm/s. For the wet wear tests, a 3.5 wt% NaCl solution was used. The resulting wear scars were analyzed by means of both SEM and optical profilometry techniques. It has been determined that, during testing under the corrosive solution, the coating experiences a severe abrasive wear mechanism, due to the combined action of the alumina ball, the hard "debris" and the phenomenon of crevice corrosion. On the other hand, it has also been shown that the coated system is able to increase the wear resistance of the substrate by more than one order of magnitude, if the wear tests are carried out in air under the same conditions.

Comparison of the PVD gradient coatings deposited onto X40CrMoV5-1 and HS6-5-2 tool steel substrate

2008

Purpose: The main aim of this research was investigation and comparison of selected properties of gradient coatings TiCN and AlSiCrN. In this paper both coatings were deposited by cathode arc evaporation physical vapour deposition (CAE-PVD) method onto high speed steel HS6-5-2 and hot work tool steel X40CrMoV5-1. Design/methodology/approach: Observations of surface and structures of the deposited coatings were carried out on cross sections in the scanning electron microscope. The phase composition of the investigated coatings was determined by means of the X-ray diffractometer. Tests of the coatings' adhesion to the substrate material were made using the scratch test. The microhardness tests of coatings were made with the ultra microhardness tester. Findings: The hard PVD gradient coatings deposited by cathodic arc evaporation method demonstrate the high hardness, adhesion and wear resistance. The critical load L C2 , which is in the range 35-67 N, depends on the coating type and material substrate. The values of friction coefficient for the investigated coatings are changing within the range of 0.08-0.25. Research limitations/implications: In order to evaluate with more detail the possibility of applying these surface layers in tools, further investigations should be concentrated on the determination of the thermal fatigue resistance of the coatings. Originality/value: It should be emphasized that the mechanical properties of the PVD coatings obtained in this work are very encouraging and therefore their application for products manufactured at mass scale is possible in all cases where reliable, very hard and abrasion resistant coatings, deposited onto tools steel substrate are needed.