A Numerical Study on the Mechanical Behaviour of Hard Coatings with Ductile Interlayers under Depth-Sensing Indentation

2010 ◽  
Vol 636-637 ◽  
pp. 1194-1198
Author(s):  
Nataliya A. Sakharova ◽  
José Valdemar Fernandes ◽  
Marta C. Oliveira ◽  
Jorge M. Antunes
Keyword(s):  
Mechanical Properties ◽  
Mechanical Behaviour ◽  
Numerical Study ◽  
Multilayer Coating ◽  
Hard Coatings ◽  
Multilayer Coatings ◽  
Depth Sensing ◽  
Ductile Metals ◽  
Titanium Aluminium

In the present study, numerical simulations of nanohardness tests of titanium aluminium nitride (TiAlN) hard coatings with titanium and aluminium ductile interlayers were performed in order to determine the influence of interlayers of ductile metals on the overall mechanical properties of multilayer coatings. The investigation was designed to determine the role of ductile interlayers in altering the hardness value and the Young´s modulus of the multilayer coating as a whole, in comparison with a monolayer TiAlN hard coating, for the cases of composites with different numbers and thicknesses of interlayers.

Influence of the nanostructure of the functional layers of a multilayer coating on the wear of a carbide tool

2021 ◽  
pp. 332-336
Author(s):  
A.A. Vereshchaka ◽  
V.P. Tabakov
Keyword(s):  
Fracture Resistance ◽  
Crack Formation ◽  
Multilayer Coating ◽  
Multilayer Coatings ◽  
Carbide Tool ◽  
Scratch Testing ◽  
Nanolayer Thickness

The results of studies of the effect of nanolayer thickness on the wear of carbide tools are presented. The effect of nanolayer thicknesses on microhardness and fracture resistance of a multilayer coating during scratch testing is shown. The role of nanostructure in the processes of crack formation in multilayer coatings during cutting is revealed.

Structure and mechanical properties of nanocrystalline Ni/Cu multilayer coatings produced by the electrocrystallization method

2019 ◽  
Vol 24 (2) ◽  
pp. 3-10
Author(s):  
Grzegorz Cieślak ◽  
Maria Trzaska ◽  
Marek Betiuk
Keyword(s):  
Mechanical Properties ◽  
Steel Substrate ◽  
Diffraction Method ◽  
Nanocrystalline Structure ◽  
Scratch Test ◽  
Multilayer Coatings ◽  
Indentation Hardness ◽  
X Ray Diffraction ◽  
Depth Sensing ◽  
The Individual

The paper presents the results of studies on the structure and mechanical properties of nanocrystalline multilayer Ni/Cu coatings. and for comparative purposes, also of nanocrystalline Ni and Cu coatings deposited by the electrocrystallization method. The structure of the produced coatings was characterized by the X-ray diffraction method and scanning electron microscopy. The tests of mechanical properties were carried out using the Depth Sensing Indentation (DSI) method. The curves of dependence of the loading force as a function of the penetration depth of the indenter of the tested coatings were determined. as well as the parameters characterizing the tested materials: indentation hardness (HIT), Martens hardness (HM), elastic modulus (EIT), elastic strain index (KH) and creep (CIT). The scratch test evaluated the adhesion of the material of coatings to the steel substrate as well as between the individual layers in multilayer coatings. Multilayer Ni/Cu coatings are characterized by, nanocrystalline structure, compact construction and uniform thickness over the entire covered surface. The materials of the tested coatings differ significantly in the course of plastic deformation and elastic deformation. The thickness of the layers in multilayer Ni/Cu coatings affects their mechanical properties.

Towards an improvement of performance of TiAlN hard coatings using metal interlayers

2002 ◽  
Vol 750 ◽  
Author(s):  
J. M. Castanho ◽  
M. T. Vieira
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Shear Stress ◽  
High Speed ◽  
Cutting Tools ◽  
Hard Coatings ◽  
Deformation Mechanisms ◽  
Multilayer Coatings ◽  
High Speed Machining ◽  
High Speed Cutting

ABSTRACTTiAlN sputtered coatings have been used with success in high-speed cutting tools in the last few years. However, the adhesive failures of the coatings refrain its application in more severe wear conditions like as high-speed machining. The assumptions for the present research were based on the hypothesis that thin metal interlayers will behave as shear stress sinkers, which could decrease the delamination of the thin films. In the present work, coatings of TiAlN with thin ductile metallic interlayers (Al, Ti, Cu and Ag) were deposited by reactive d.c. magnetron sputtering. Multilayer coatings with aluminum, titanium and silver interlayers achieve higher adhesion values (70N) than TiAlN monolithic coating (40N). Three and five metal ductile layers contribute to an increase of hardness and Young's modulus without change the residual stresses of the monolithic coating. Contrarily, the introduction of copper layers reduces all the studied mechanical properties of the TiAlN monolithic coatings, which are related to the different deformation mechanisms of the ductile interlayers.

Measuring Elastic Properties of the Constituent Multilayer Coatings for Different Modulation Periods

2018 ◽  
Vol 10 (04) ◽  
pp. 1850046 ◽  
Author(s):  
Nadia Chakroun ◽  
Aymen Tekaya ◽  
Hedi Belhadjsalah ◽  
Tarek Benameur
Keyword(s):  
Mechanical Properties ◽  
Multilayer Coating ◽  
Multilayer Coatings ◽  
Multilayer Thin Films ◽  
Analysis Method ◽  
New Model ◽  
Proposed Model ◽  
Reverse Analysis ◽  
Dimensional Analysis Method

This paper is developed to characterize mechanical properties of multilayer coatings for different modulation periods. To that end, Dimensional Analysis Method (DAM) and Finite Element Method (FEM) are applied. Based on these methodologies, two dimensionless forms for the new model are expressed. Numerical nanoindentation tests are carried out for different set properties of multilayer coatings in order to validate the proposed model. Therefore, the mechanical properties of multilayer thin films are identified according to the reverse analysis algorithm. Hence, the input and the identified properties are consistent which ensure the effectiveness and the reliability of the proposed model. Moreover, a case study of Ti-TiN multilayer coating deposited on Zr-based metallic glasses was considered. As a result, the new model is useful for multilayer coatings for different modulation periods and can be used for technological applications.

scholarly journals Hard X-Ray Focusing with Curved Reflective Multilayers

2010 ◽  
Vol 2010 ◽  
pp. 1-8 ◽  
Author(s):  
Christian Morawe ◽  
Markus Osterhoff
Keyword(s):  
Experimental Data ◽  
Essential Role ◽  
Multilayer Coating ◽  
Multilayer Coatings ◽  
X Rays ◽  
Optical Performance ◽  
Comprehensive Overview ◽  
X Ray ◽  
Numerical Approaches

This paper provides a comprehensive overview on the utilization of curved graded multilayer coatings as focusing elements for hard X-rays. It concentrates on the Kirkpatrick-Baez (KB) focusing setup that has been developed at 3rd generation synchrotron sources worldwide. The optical performance of these devices is evaluated applying analytical and numerical approaches. The essential role of the multilayer coating and its meridional d-spacing gradient are discussed as well as important technological issues. Experimental data and examples of operational KB focusing devices and applications complement the work.

Evaluation of Tribological and Mechanical Properties of Nitride Thin Films Prepared by Cathodic ARC Deposition

2002 ◽  
Vol 750 ◽  
Author(s):  
Pallavi Shukla ◽  
A. K. Sikder ◽  
Ashok Kumar ◽  
Robert Durvin ◽  
Mark McDonough ◽  
...  
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Tribological Properties ◽  
High Speed Steel ◽  
Hard Coatings ◽  
Depth Sensing ◽  
Wear Resistant ◽  
Cathodic Arc Deposition ◽  
Cathodic Arc ◽  
Arc Deposition

ABSTRACTMechanical and tribological properties of thin films draw special attention and differ from those of bulk materials due to the effects of interfaces, microstructure and thick underlying substrates. In this study hard wear resistant nitride coatings (TiN, ZrN, TiAlN, TiCN and CrN) were coated on high speed steel substrates using cathodic arc deposition method. Mechanical properties of the films were evaluated using nanoindentation technique. Continuous stiffness method was employed to evaluate the depth sensing hardness and modulus values. Studies of tribological properties were performed using ball-on-disk friction and wear test. We have also investigated the wear track using optical microscopy. Variation of coefficient of friction with time has been analyzed and coating endpoint was estimated. Nanoindentation evaluation of mechanical properties along with the measurement of tribological properties is very useful in order to use them as wear resistant hard coatings.

Pulse laser processing of hard-alloy cutting tool with multilayer coating

2021 ◽  
pp. 74-78
Author(s):  
Keyword(s):  
Mechanical Properties ◽  
Laser Processing ◽  
Cutting Tool ◽  
Structural Parameters ◽  
Multilayer Coating ◽  
Pulsed Laser ◽  
Multilayer Coatings ◽  
Carbide Cutting Tool ◽  
Structural Indicators ◽  
Coated Carbide

The influence of pulsed laser treatment (PLT) on the structural parameters and mechanical properties of singlelayer and multilayer coatings is investigated. The contact indicators during cutting, indicators of the thermal and stressed state of the cutting wedge of a tool with multilayer coatings that have passed the PLT are presented. The effectiveness of PLT for multi-coated carbide cutting tool is shown. Keywords: pulsed laser processing, carbide cutting tool, multilayer coating, structural indicators, indicators of mechanical properties, durability period. [email protected], [email protected]

AN ANALYSIS OF MECHANICAL AND TRIBOLOGICAL PROPERTIES OF Zr/Zr2N MULTILAYER COATINGS

Tribologia ◽  
2019 ◽  
Vol 286 (4) ◽  
pp. 15-22
Author(s):  
Marcin KOT ◽  
Jurgen LACKNER ◽  
Łukasz MAJOR ◽  
Marcin SZCZĘCH ◽  
Grzegorz WIĄZANIA ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Resistance ◽  
Multilayer Coating ◽  
Microscopic Analysis ◽  
Scratch Resistance ◽  
Multilayer Coatings ◽  
Ratio Increase ◽  
Ceramic Phase ◽  
Mechanical And Tribological Properties ◽  
Metal Layers

The paper presents the analysis of effect of the Zr to Zr2N layer thickness ratios of 1:1, 1:2, and 1:4 on the mechanical properties of Zr /Zr2N multilayer coatings. With the increase in the amount of the ceramic phase in the multilayer coating, an increase in hardness from 11 to 14.5 GPa and Young's modulus from 158 to 211 GPa was observed. This was accompanied by improved scratch resistance as critical load LC2 raises from 17 to over 30N. A ratio increase from 1:1 to 1:2 caused a 3-fold improvement in the coating wear resistance, which was also accompanied by a change in the wear mechanism. However, there was no further improvement of this parameter with a ratio increase to 1:4. Microscopic analysis of wear tracks, using the TEM technique revealed that the Zr metal layers change the direction of crack propagation. This phenomenon results in the improved fracture resistance of multilayer coatings compared to single coatings. Such a mechanism was even observed for the 1:4 coating with the thinnest 58nm Zr layers.

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