Carbon based coatings for applications in friction couples with bearing steel and aluminium alloy

2017 ◽  
Vol 1 (87) ◽  
pp. 12-20
Author(s):  
M. Makówka ◽  
B. Wendler
Keyword(s):  
Tribological Properties ◽  
Steel Substrate ◽  
Bearing Steel ◽  
Friction Couple ◽  
Low Friction ◽  
Alsi Alloy ◽  
Pin On Disc ◽  
New Type ◽  
Steel Substrates ◽  
Carbon Based

Purpose: Low friction nc-WC/a-C:H coatings deposited by means of magnetron sputtering provide very good tribological properties in friction couple against hard steels and good adhesion to steel substrates. Nevertheless, it was necessary to elaborate a new type of coatings because the nc-WC/a-C:H one had no use in friction couple against aluminium alloys. Design/methodology/approach: In the paper the WC/a-C:H and (Si, Cr)C/a-C:H coatings were investigated. The coatings were investigated by means of SEM, EDS, in order to obtain thickness, surface morphology and chemical composition of coatings. Tribological properties of deposited coatings were elaborated by means of 'pin-on-disc' method in friction couple against 100Cr6 bearing steel and AlSi alloy. Findings: It was stated that (Si, Cr)C/a-C:H coatings have very good tribological properties in friction couple against bearing steel and AlSi alloy (friction coefficient <0,1). In case of WC/a-C:H coatings, good tribological properties were achieved in friction couple with bearing steel. Both coatings have very low wear rate in investigated friction couples. Research limitations/implications: The (Si,Cr)C/a-C:H coating have a worse quality of adhesion to quenched and tempered Vanadis 23 HS steel substrate in comparison with the nc-WC/a-C:H coating. Resolving this disadvantage can increase potential of application of (Si, Cr)C/a-C:H coatings. Practical implications: Newly developed (Si, Cr)C/a-C:H coating has a greater application potential for modification of surfaces of elements working in friction couples against hardened steels and light alloys like AlSi. Originality/value: There are numerous publications where low friction carbon based coatings were described mostly as a coatings deposited on elements working in friction couples against hard steels. Undertaken tests showed that the newly developed (Si,Cr)C/a- C:H coating can have a broad spectrum of applications in friction couples against different counterbodies, including light Al alloys.

Tribological Properties of Plasma-Sprayed 20 wt. % ZrO2-Al2O3-17 wt.% TiO2 Coatings on Plain Carbon Steel Substrate

2012 ◽  
Vol 463-464 ◽  
pp. 420-424
Author(s):  
San Ming Du ◽  
Yong Ping Niu ◽  
Yong Zhen Zhang
Keyword(s):  
Carbon Steel ◽  
Tribological Properties ◽  
Steel Substrate ◽  
Plain Carbon Steel ◽  
X Ray Diffraction ◽  
Properties Of Coatings ◽  
Bond Layer ◽  
Spray Technique ◽  
Pin On Disc ◽  
Plasma Sprayed

In the present study, 20 Wt. % ZrO2-Al2O3-17 wt.% TiO2 powders were sprayed using a plasma-spray technique after a NiAl bond layer was deposited on plain carbon steel substrate. The produced coatings were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) including energy-dispersive spectroscopy (EDS). The tribological properties of coatings against hard alloy ball were investigated by using a pin-on-disc tribo-meter under dry environments. The predominant wear mechanism of coating is fatigue.

Assessment of Tribological Properties of Low Friction Thin Layers Produced by Vacuum Methods

2019 ◽  
Vol 293 ◽  
pp. 125-140
Author(s):  
Agnieszka Paradecka ◽  
Krzysztof Lukaszkowicz ◽  
Jozef Sondor
Keyword(s):  
Wear Resistance ◽  
Friction Coefficient ◽  
Chemical Analysis ◽  
Coefficient Of Friction ◽  
Tribological Properties ◽  
Structural Changes ◽  
Thin Layers ◽  
Low Friction ◽  
Topographic Analysis ◽  
Steel Substrates

Low friction thin layers are an excellent alternative for conventional coatings. They provide increased life of the elements, to which they were applied, due to enhancing the hardness or chemical and electrochemical resistance. They help to avoid the cracks, oxidation, as well as possible structural changes during the element's work. However, they primarily improve tribological properties by increasing wear resistance and reducing the friction. This also applies to components operating under variable conditions such as load, speed, temperature. The presented article analyzes the properties of various low-friction thin layers deposited by vacuum methods on the steel substrates. DLC, TiC, MoS2, CrCN thin layers were chosen, as they achieve the lowest possible coefficient of friction. In the framework of this work the measurements of adhesion of the investigated layers to the substrate as well as the friction coefficient, chemical analysis, microstructure and topographic analysis of the low-friction layers were carried out.

A Study on the Tribological Properties of DLC Films Deposited with Different Reaction Gases

2005 ◽  
Vol 903 ◽  
Author(s):  
Yong Ki Cho ◽  
Gang San Kim ◽  
Kyoung Il Moon ◽  
Sang Gweon Kim ◽  
Sung Wan Kim
Keyword(s):  
Friction Coefficient ◽  
Tribological Properties ◽  
Hydrogen Content ◽  
Automobile Industry ◽  
High Strength ◽  
Optical Microscope ◽  
Low Friction ◽  
Pulsed Dc ◽  
Graphite Structure ◽  
Steel Substrates

AbstractDiamond like carbon (DLC) coatings have attracted great attention for use in various applications in automobile industry and machinery because they have excellent properties such as low friction coefficient and ultra high strength. The low friction coefficient of DLC comes from anti-adhesion with other materials, smooth surface, lubrication of graphite structure at the contacting point of films, and the hydrogen content of the films. Many researches have been focused on the microstructure effects on the tribological properties of DLC films but few have been reported on the effect of hydrogen content. In this study, the effect of hydrogen content on the friction coefficient of DLC films has been investigated.DLC films have been deposited on D2 steel by plasma enhanced CVD (Pulsed DC PECVD) method with different precursor gas of C2H2and CH4and different gas pressure. The effects of gas composition on the hydrogen content in DLC films and the resulting tribological properties have been reviewed. Si interlayer was deposited on D2 to improve adhesion of DLC on steel substrates. The characteristics of microstructure were evaluated by Raman spectroscope and composition was measured by RBS and EDS. The tribological behaviors of DLC films were investigated using ball on disk tribometer. The hardness of films was examined by nano-indenter. The failure mechanism of DLC deposited on steel substrates was examined using optical microscope and SEM/EDS. The results showed that the friction coefficient of DLC films deposited with C2H2was 0.06 and that of the film with CH4was 0.15. The friction coefficient improved with decreasing hydrogen content in DLC films.

Micromechanical and Tribological Properties of Nanostructured Carbonitride Coatings Deposited by PVD Technique

2021 ◽  
Vol 903 ◽  
pp. 177-182
Author(s):  
Armands Leitans ◽  
Janis Lungevics ◽  
Uldis Kanders ◽  
Irina Boiko
Keyword(s):  
Tribological Properties ◽  
High Power ◽  
Physical Vapor Deposition ◽  
Bearing Steel ◽  
High Tech ◽  
The Novel ◽  
Mechanical And Tribological Properties ◽  
Smart Coatings ◽  
Steel Substrates ◽  
Erosion Zone

Nanostructured smart coatings (NSC) based on the TiAlSi-CN composite structure elements were deposited using reactive high-power physical vapor deposition (PVD) technique. The advanced modular deposition system included up to 8 high-power magnetron sputtering devices (MSD) allowing operate them simultaneously and exceed power density of 120 W/cm2 within each device erosion zone. The novel designed NSC on bearing steel 100Cr6 substrates demonstrated enhanced mechanical and tribological properties comparably with bearing steel ones required for multifunctional high-tech applications. The deposited NSC containing TiAlSi-CN nanoparticles strengthened by elemental additives Cr and Nb exhibited microhardness as high as 2500 HV values in comparison with 750 HV of 100Cr6 steel substrates. Load-displacement curves obey Meyer’s power-law surprisingly well because power-trendline fitted ones by R-squared value of 0.9999 for all the film-samples. Tribological properties were measured under dry friction conditions between the bearing steel ball of Ø 6 mm and the film-samples’ flat surface. Coefficient of friction (CoF) ranges between 0.22-0.56 depending on a sample and load. Tribotracks worn under the friction indenter were too shallow to evaluate them by Mitutoyo profilometer SJ-500. Therefore, the wear rate was estimated as ball wear of the friction indenter.

Research on the Tribological Properties of SF Polymer Water-Lubricated Bearings

2010 ◽  
Vol 150-151 ◽  
pp. 102-107 ◽  
Author(s):  
Zhu Xin Wu ◽  
Lin Liu Zheng ◽  
Fa Xiao Fan
Keyword(s):  
Friction Coefficient ◽  
Tribological Properties ◽  
Load Capacity ◽  
Low Friction ◽  
Swelling Properties ◽  
Shipbuilding Industry ◽  
Simulation Testing ◽  
New Type ◽  
Water Swelling ◽  
High Load Capacity

In the paper, the SF polymer water lubricated bearings is taken as the research objects. Both material testing and bearing simulation testing are carried out to research the tribological properties of bearings including water swelling properties, friction coefficient, and wear-resistant properties mainly. The results show that the SF material, which is a new type of material used in water lubricated tail bearing, has the characteristics of low friction coefficient, high load capacity, good wear-resistance, excellent self-lubricating properties, and low water swelling, which has a broad application in the shipbuilding industry.

scholarly journals The Structural, Mechanical and Tribological Properties of Vanadium Nitride Film Deposited by Magnetron Sputtering

2020 ◽  
Author(s):  
Ayşenur Keleş ◽  
Hossein Ahmad Aghdam ◽  
Özlem Baran ◽  
İhsan Efeoğlu
Keyword(s):  
Magnetron Sputtering ◽  
Tribological Properties ◽  
Pulse Frequency ◽  
Fatigue Properties ◽  
Nitride Film ◽  
Vanadium Nitride ◽  
Mechanical And Tribological Properties ◽  
Gas Atmosphere ◽  
Pin On Disc ◽  
Steel Substrates

Abstract In this work, vanadium nitride (VN) thin films deposited on 52100 steel substrates with magnetron sputtering system using two vanadium targets and Ar/N 2 gas atmosphere at different substrate pulse frequencies. X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS) were used to analyze the microstructure and elemental composition of the films. Adhesion and fatigue properties of films were analyzed a scratch tester. Pin-on-disc tribo-tester was carried out to determine tribological properties. It was observed from the test results that substrate pulse frequency has a significant effect on mechanical and tribological properties of VN films. According to XRD, all films have VN and V 2 N phases. The intensity of V 2 N (211) peak decreased with increasing frequency, whereas VN (111) peak intensity were increased. Also, the film thickness slightly changed depending on the pulse frequency. The best mechanical and tribological properties were found at 200kHz substrate pulse frequency.

scholarly journals Structure and tribological properties of DLC:Si/AlCrN low friction thin film

2019 ◽  
Vol 252 ◽  
pp. 08002 ◽  
Author(s):  
Agnieszka Paradecka ◽  
Krzysztof Lukaszkowicz ◽  
Mirosława Pawlyta
Keyword(s):  
Raman Spectroscopy ◽  
Tribological Properties ◽  
Steel Substrate ◽  
Scratch Test ◽  
Composition Analysis ◽  
Low Friction ◽  
Carbon Coatings ◽  
Dlc Coatings ◽  
Wide Range ◽  
The Subject

A wide range of diamond-like carbon coatings is caused by their structure composed of sp2 and sp3 carbon hybridisation and the possibility of both metallic and non-metallic admixtures or the creation of a hydrogenated form. One of the ways to improve the tribological properties of DLC is to dope it with silicon. Deposited on stainless steel substrate coating system composed of AlCrN film covered by DLC:Si was the subject of the studies. The AlCrN and DLC:Si layers were deposited by PVD lateral rotating ARC-cathodes and PACVD on the X6CrNiMoTi17-12-2 steel respectively. Characteristics of DLC:Si film was performed by imaging the topography using SEM and AFM. The structure was investigated using a Raman spectroscopy and HRTEM. Tribological and adhesion tests were carried out using a ball-on-disc and a scratch test respectively. Tests using the TEM confirmed an amorphous character of DLC:Si layer. A phase composition analysis of the DLC:Si layer with the Raman spectroscopy method showed the presence of bonds distinctive for diamond (sp3) and graphite (sp2), typically observed in DLC coatings. Under the technically dry friction conditions, the friction coefficient for the associations tested is within the range 0.14 for the investigated coating.

Study on Wear and Friction Resistance of CrTiAlMoN Coatings Deposited by Magnetron Sputtering

2011 ◽  
Vol 413 ◽  
pp. 295-299
Author(s):  
Tao Wang ◽  
Guo Jun Zhang ◽  
Bai Ling Jiang
Keyword(s):  
Carbon Steel ◽  
Magnetron Sputtering ◽  
Adhesive Wear ◽  
High Hardness ◽  
Bearing Steel ◽  
Friction Resistance ◽  
Wear And Friction ◽  
Pin On Disc ◽  
Friction Performance ◽  
Steel Substrates

The present research aims to synthesize a nanoscale multilayer CrTiAlMoN hard coating for the modification of wear and friction performance, as compare to CrTiAlN coatings. CrTiAlMoN coatings were deposited on 1045 carbon steel substrates by magnetron sputtering at different Mo target current. The wear and friction resistance were characterized by pin-on-disc test. When a WC-Co ball was used as the counterpart, the coefficients of friction of CrTiAlMoN coatings were found to decrease with the increase of Mo target current, with the lowest value (0.34) being only one half that of CrTiAlN coating (0.76). The combination of high hardness above 36GPa and low coefficients of friction reduces the specific wear rate of the CrTiAlMoN coatings to only 10% of CrTiAlN coatings. When tested against a bearing steel ball, results demonstrate that the effect of Mo on reducing friction of the CrTiAlMoN coatings is not significant and even negative due to adhesive wear.

Study on Microstructure and Tribological Properties of Graphite-Like Carbon Films

2014 ◽  
Vol 852 ◽  
pp. 309-313
Author(s):  
Bai Jun Shi ◽  
Si Chi Wu ◽  
Yuan Ping Peng ◽  
Shu Hui Liao
Keyword(s):  
Tribological Properties ◽  
Steel Substrate ◽  
Energy Dispersive Spectrometer ◽  
Carbon Films ◽  
Low Friction ◽  
Columnar Crystal ◽  
Unbalanced Magnetron Sputtering ◽  
Unbalanced Magnetron ◽  
Low Wear ◽  
Ball On Disc

Graphite-like carbon films were deposited on DC53 steel substrate by unbalanced magnetron sputtering. The microstructures of the resultant films were investigated by Raman spectroscopy, scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffractometer (XRD), respectively. Ball-on-disc tribometer was employed to analyze the tribological properties of the film. The results show that the films were dominated by sp2 sites. The surfaces are uniform and dense, the sectional morphology of the films present dense columnar crystal. The films have superior tribological properties under different loads, including low friction coefficient (0.18-0.33) and low wear rate (2.53×10-17m3/(Nm)- 8.47×10-17m3/(Nm)).

Effects of niobium pentoxide nanoparticles on the tribological properties of electrodeposited ZnNi coatings

2022 ◽  
Author(s):  
Hema C. R. Moreira ◽  
Jorge A. B. Oliveira ◽  
Neftali L. V. Carreño ◽  
Ricardo M. Silva ◽  
Irene T. S. Garcia ◽  
...  
Keyword(s):  
Tribological Properties ◽  
Photoelectron Spectroscopy ◽  
Normal Load ◽  
Niobium Pentoxide ◽  
X Ray Diffraction ◽  
Low Friction ◽  
Electrolytic Bath ◽  
X Ray ◽  
Coated Surfaces ◽  
Steel Substrates

Abstract Electrodeposited ZnNi coatings are widely used to improve the corrosion resistance of steel substrates, but their tribological properties are also relevant for loaded contacts under relative motion. This work investigates the hypothesis of improving tribological properties of electrodeposited ZnNi coatings via dispersion of niobium pentoxide nanoparticles (1g/L) in the electrolytic bath. The niobium pentoxide nanoparticles were produced via hydrothermal synthesis assisted by microwave. The surface morphology and chemical composition of the coatings were analysed by scanning electron microscopy coupled with X-ray dispersive energy, X-ray diffraction and X-ray photoelectron spectroscopy. The tribological performance of the coatings was assessed using dry reciprocating ball-on-flat tests at normal loads between 3 and 6 N. The use of niobium pentoxide nanoparticles resulted in significantly denser coatings, with some Nb incorporated in the coated surfaces. Under the lowest normal load, all coated specimens showed relatively low friction (~0.2) and negligible damag. As the normal load increased, the coating produced using niobium pentoxide nanoparticles showed stronger adherence, while conventional ZnNi coating showed increased friction and spalling for the highest load. It is believed that the Nb2O5 nanoparticles increased the number of sites for heterogeneous nucleation, refining the microstructure, so that tougher and more adherent coatings were produced.

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