Nanostructured Hard Coatings - From Nanocomposites to Nanomultilayers

2006 ◽  
pp. 35-42
Author(s):  
J. Patscheider ◽  
T. Zehnder ◽  
J. Matthey ◽  
M. Diserens
Keyword(s):  
Hard Coatings

Microstructural characterization of sol-gel coating on PET films

1994 ◽  
Vol 52 ◽  
pp. 886-887
Author(s):  
R. T. Chen ◽  
R.A. Norwood
Keyword(s):  
Ion Beam ◽  
Sol Gel ◽  
Industrial Applications ◽  
Hard Coatings ◽  
Nanometer Scale ◽  
Ion Beam Sputtering ◽  
Process Technology ◽  
Refractive Index Measurement ◽  
Organically Modified ◽  
Pet Films

Sol-gel processing has been used to control the structure of a material on a nanometer scale in preparing advanced ceramics and glasses. Film coating using the sol-gel process was also found to be a viable process technology in applications such as optical, porous, antireflection and hard coatings. In this study, organically modified silicate (Ormosil) coatings are applied to PET films for various industrial applications. Sol-gel materials are known to exhibit nanometer scale structures which havepreviously been characterized by small-angle X-ray scattering (SAXS), neutron scattering and light scattering. Imaging of the ultrafine sol-gel structures has also been performed using an ultrahigh resolution replica/TEM technique. The objective of this study was to evaluate the ultrafine structures inthe sol gel coatings using a direct imaging technique: atomic force microscopy (AFM). In addition, correlation of microstructures with processing parameters, coating density and other physical properties will be discussed.The materials evaluated are organically modified silicate coatings on PET film substrates. Refractive index measurement by the prism coupling method was used to assess density of the sol-gel coating.AFM imaging was performed on a Nanoscope III AFM (by Digital Instruments) using constant force mode. Solgel coating samples coated with a thin layer of Ft (by ion beam sputtering) were also examined by STM in order to confirm the structures observed in the contact type AFM. In addition, to compare the previous results, sol-gel powder samples were also prepared by ultrasonication followed by Pt/Au shadowing and examined using a JEOL 100CX TEM.

Properties and Performance of Hard Coatings on Tool Steels under Cyclic Indentation

2009 ◽  
Vol 13 (3) ◽  
pp. 84-95 ◽  
Author(s):  
Alina Sivitski ◽  
Andre Gregor ◽  
Mart Saarna ◽  
Priit Kulu ◽  
Fjodor Sergejev
Keyword(s):  
Hard Coatings ◽  
Tool Steels ◽  
Cyclic Indentation ◽  
And Performance

Generalized approach of scratch adhesion testing and failure classification for hard coatings using the concept of relative area of delamination and properly scaled indenters

2021 ◽  
pp. 127118
Author(s):  
Martin Zawischa ◽  
Muhammad Muiz Azri Bin Mohamad Supian ◽  
Stefan Makowski ◽  
Frank Schaller ◽  
Volker Weihnacht
Keyword(s):  
Hard Coatings ◽  
Relative Area ◽  
Adhesion Testing ◽  
Failure Classification

scholarly journals Characterization of Ta-B-C nanostructured hard coatings

2017 ◽  
Vol 175 ◽  
pp. 012020 ◽  
Author(s):  
J Buršík ◽  
V Buršíková ◽  
P Souček ◽  
L Zábranský ◽  
P Vašina
Keyword(s):  
Hard Coatings

scholarly journals Wear Resistance of (Ti,Al)N Metallic Coatings for Extremal Working Conditions

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 157
Author(s):  
Jarosław Mikuła ◽  
Daniel Pakuła ◽  
Ludwina Żukowska ◽  
Klaudiusz Gołombek ◽  
Antonín Kříž
Keyword(s):  
Wear Resistance ◽  
Functional Properties ◽  
Tool Life ◽  
Cutting Tools ◽  
Hard Coatings ◽  
Metallographic Analysis ◽  
Process Conditions ◽  
Tool Materials ◽  
Coated Materials ◽  
Wide Range

The article includes research results for the functional properties achieved for a wide range of sintered tool materials, including sintered carbides, cermets and three types of Al2O3 oxide tool ceramics ((Al2O3 + ZrO2, Al2O3 + TiC and Al2O3 + SiC(w)) with (Ti,Al)N coating deposited in the cathodic arc evaporation (CAE-PVD) method and comparison with uncoated tool materials. For all coated samples, a uniform wear pattern on tool shank was observed during metallographic analysis. Based on the scanning electron microscope (SEM) metallographic analysis, it was found that the most common types of tribological defects identified in tested materials are: mechanical defects and abrasive wear of the tool side, crater formation on the tool face, cracks on the tool side, chipping on the cutting edge and built-up edge from chip fragments. Deposition of (Ti,Al)N coating on all tested substrates increases the wear resistance and also limits the exceeding of critical levels of permanent stresses. It even increases the tool life many times over. Such a significant increase in tool life results, among other things, from a large increase in microhardness of PVD coated materials compared to uncoated samples, increased resistance to thermal and chemical abrasion, improved chip formation and removal process conditions. Use of hard coatings applied to sintered tool materials is considered to be one of the most important achievements in improving the functional properties of cutting tools and can still be developed by improving the coating structure solutions (sorted and nanocrystalline structures) and extending the range of coating applications (Ti,Al)N in a variety of substrates.

Increasing hydrophobicity of sol–gel hard coatings by chemical and morphological modifications

2005 ◽  
Vol 198 (1-3) ◽  
pp. 420-424 ◽  
Author(s):  
Linda Y.L. Wu ◽  
A.M. Soutar ◽  
X.T. Zeng
Keyword(s):  
Sol Gel ◽  
Hard Coatings

scholarly journals Increased Surface Fatigue Lives of Spur Gears by Application of a Coating

2004 ◽  
Vol 126 (6) ◽  
pp. 1047-1054 ◽  
Author(s):  
Timothy Krantz ◽  
Clark Cooper ◽  
Dennis Townsend ◽  
Bruce Hansen
Keyword(s):  
Magnetron Sputtering ◽  
Fatigue Failure ◽  
Hard Coatings ◽  
Spur Gears ◽  
Surface Fatigue ◽  
Accelerated Life Tests ◽  
Accelerated Life ◽  
Life Tests ◽  
Carbon Based

Hard coatings have potential for increasing gear surface fatigue lives. Experiments were conducted using gears both with and without a metal-containing, carbon-based coating. The gears were case-carburized AISI 9310 steel spur gears. Some gears were provided with the coating by magnetron sputtering. Lives were evaluated by accelerated life tests. For uncoated gears, all of 15 tests resulted in fatigue failure before completing 275 million revolutions. For coated gears, 11 of the 14 tests were suspended with no fatigue failure after 275 million revolutions. The improved life owing to the coating, approximately a sixfold increase, was a statistically significant result.

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