Crack and Wear Resistance of Hard Coatings

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.

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Wear resistance of hard coatings in plastics processing

Surface and Coatings Technology ◽

10.1016/s0257-8972(98)00449-6 ◽

1998 ◽

Vol 105 (1-2) ◽

pp. 38-44 ◽

Cited By ~ 37

Author(s):

M Heinze

Keyword(s):

Wear Resistance ◽

Hard Coatings ◽

Plastics Processing

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Fretting wear resistance of DLC hard coatings deposited on nitrided martensitic stainless steel

Journal of Materials Research and Technology ◽

10.1016/j.jmrt.2017.12.004 ◽

2019 ◽

Vol 8 (1) ◽

pp. 259-266 ◽

Cited By ~ 3

Author(s):

Eugenia L. Dalibon ◽

Jorge N. Pecina ◽

Amado Cabo ◽

Vladimir J. Trava-Airoldi ◽

Sonia P. Brühl

Keyword(s):

Stainless Steel ◽

Wear Resistance ◽

Martensitic Stainless Steel ◽

Hard Coatings ◽

Fretting Wear

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Wear Resistance of Hard Coatings in Powder Injection Molding (PIM)

ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, Volume 1 ◽

10.1115/esda2010-24590 ◽

2010 ◽

Author(s):

Ali Keshavarz Panahi ◽

Hossein Khoshkish ◽

Mostafa Rezaee Saraji

Keyword(s):

Wear Resistance ◽

Injection Molding ◽

Wear Behavior ◽

Chemical Vapour ◽

Powder Injection Molding ◽

Economic Feasibility ◽

Hard Coatings ◽

Powder Injection ◽

Good Opportunity ◽

Wear Protection

The degree of machine wear decisively determines the economic feasibility of powder injection molding. According to higher hardness of alumina powders (ca. 2000HV), manufacturing of ceramic components via PIM requires hard wear resistance equipments to overcome the wear phenomena. The wear test is based on the ASTM rubber wheel but the rubber wheel is replaced by a steel wheel of the same grade used in the barrel of an injection molding machine. The potential of hard coatings for wear protection in feedstock processing units is investigated in the present study. Model wear tests were carried out to demonstrate the tribological situation inside the screw/barrel system of extruders and injection molding machines. The substrate material was AISI 4140 steel which is used for PIM machine components. Hard coatings prepared by physical vapor deposition (PVD) and chemical vapour deposition (CVD) offer a good opportunity for wear protection. Due to higher temperature of feedstock and compression, the amount of wear in the metering zone is higher in comparison with other zones. The wear behavior also was strongly influenced by the characteristics of the feedstock (e.g. amount, size, shape and hardness of ceramic particles).

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A comparative study on the high temperature dry sliding wear behavior of TiN and AlTiN/TiSiN coatings fabricated by PVD technique

Industrial Lubrication and Tribology ◽

10.1108/ilt-12-2018-0458 ◽

2019 ◽

Vol 71 (7) ◽

pp. 861-868 ◽

Cited By ~ 1

Author(s):

Emre Altaş ◽

Azmi Erdogan ◽

Fatih Koçyiğit

Keyword(s):

Wear Resistance ◽

High Temperature ◽

Physical Vapor Deposition ◽

Wear Behavior ◽

Experimental Studies ◽

Hard Coatings ◽

Dry Sliding Wear ◽

Microstructural Investigation ◽

Content Type ◽

High Temperature Wear

Purpose This study aims to investigate the high-temperature wear behavior of the TiN- and AlTiN/TiSiN-coated WC materials. Design/methodology/approach The coating process was carried out using the physical vapor deposition (PVD) method. Wear tests were performed by a ball-on-disc wear device with a high-temperature wear module. In microstructural investigation of the materials, it was benefited from traditional characterization methods such as, SEM, EDX analysis and microhardness measurement. Findings The best wear performance was obtained with AlTiN/TiSiN-coated WC materials at all loads and temperatures, followed by TiN-coated and uncoated WC samples. An important wear was not observed on the samples tested at room temperature tests. It was found that the temperature increase is an effective parameter on the decrease of the wear resistance of the samples. In addition, it was seen that the increasing load and temperature change the wear mechanism on the uncoated WC sample. The wear mechanisms observed at high temperatures were delamination and oxidation for the WC, fatigue for AlTiN/TiSiN-coated WC and micro-scratch and micro-spalling for TiN-coated WC. Originality/value The results of the experimental studies demonstrated that hard coatings improving wear resistance of WC.

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Wear Resistance of Chromium- Nitride and Diamond-like Carbon Thin Hard Coatings

Materials Testing ◽

10.3139/120.100892 ◽

2008 ◽

Vol 50 (6) ◽

pp. 326-331 ◽

Cited By ~ 3

Author(s):

Zdravko Schauperl ◽

Vinko Ivušić ◽

Biserka Runje

Keyword(s):

Wear Resistance ◽

Hard Coatings ◽

Chromium Nitride ◽

Diamond Like Carbon

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PVD Hard Coatings for High Loaded Al Alloys – Potentials and Limitations

Materials Science Forum ◽

10.4028/www.scientific.net/msf.828-829.334 ◽

2015 ◽

Vol 828-829 ◽

pp. 334-339 ◽

Cited By ~ 1

Author(s):

Anja Buchwalder ◽

Erik Zaulig ◽

Rolf Zenker ◽

Jürgen Liebich

Keyword(s):

Wear Resistance ◽

Corrosion Resistance ◽

Bearing Capacity ◽

Base Material ◽

Al Alloys ◽

Hard Coatings ◽

Hard Coating ◽

Load Bearing Capacity ◽

Load Bearing ◽

Research Activities

PVD hard coating is a well-known surface treatment technology for steels to improve wear resistance and, to some extent, corrosion resistance. In principle, hard coating can be carried out for Al alloys, but due to the natural oxide layer and the insufficient load-bearing capacity of the soft base material, the application of this technology for wear protection of components is not regarded as being particularly promising. The research activities described in this paper focused on electron beam (EB) surface alloying with a Co-based additive, and the influence of two different hardness levels (270HV0.1 and 390HV0.1) on the improvement of the local load-bearing capacity of Al alloys with thin PVD hard coatings. A further focus of this research was on the material-specific aspects of the coating deposition. Compared to steels, the hard coated surface of Al alloys is rougher and the measured adhesion of the coating is significantly lower. For this purpose, different technological PVD parameters (e.g. Ti interlayer, deposition temperature, and time) were adapted to optimize the coating properties – especially adhesion. The paper deals with comparative studies of single (PVD hard coating of Al base material) and duplex treatment (EB alloying of Al base material and subsequent PVD hard coating) by means of improvement of the coating and compound hardness, friction and wear behavior (pin-on-disc test), as well as the corrosion resistance (potentiodynamic measurements in 0.05M H2SO4). While the level of improvement in wear resistance as a result of the duplex treatments strongly depended on the adhesion of the thin coatings, the corrosion behavior was strongly influenced by the PVD deposition process and coating thickness.

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Tribomechanical Properties of Self Lubricated Oxide Ceramic Hard Coatings

2002 International Joint Power Generation Conference ◽

10.1115/ijpgc2002-26089 ◽

2002 ◽

Author(s):

Maksim Kireitseu ◽

Sergey Yerakhavets ◽

M. Istomin

Keyword(s):

Wear Resistance ◽

Wear Rate ◽

Ceramic Coating ◽

Hard Coatings ◽

Oxide Ceramic ◽

Load Range ◽

Optimal Load ◽

Tribomechanical Properties ◽

Sprayed Coatings ◽

Thermal Sprayed Coatings

A lot of researches indicate a great importance of thermal sprayed coatings for wear resistance. However some valuable properties such as self-lubrication ability of thermal sprayed coatings become hesitated some times. This paper revealed tribomechanic properties of hard oxide aluminum ceramic coating and bronze-based thermal flame sprayed coatings in view of self lubrication that take place under insufficient lubrication due to vaporization, localized load etc. In this work, hard oxide ceramic coating and bronze based coatings were investigated. Some of them were impregnated by polyethylene or oil sealant. The test revealed an effect of lubricant temperature on tribological properties of the coatings and its self sealing properties. The tests revealed an effect of porosity, hardness, adhesion and structure on wear rate and coefficient of friction of the coatings. The obtained results demonstrate an optimal load range for the coatings.

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