scholarly journals WEAR RESISTANCE OF ELECTRODEPOSITED Fe-W ALLOY COATINGS UNDER DRY CONDITIONS AND IN THE PRESENCE OF RAPESEED OIL

2018 ◽  
Vol 1 (1) ◽  
pp. 16-23 ◽  
Author(s):  
A. Nicolenco ◽  
N. Tsyntsaru ◽  
T. Matijošius ◽  
S. Asadauskas ◽  
H. Cesiulis
Keyword(s):  
Coefficient Of Friction ◽  
Wear Mechanism ◽  
Dry Friction ◽  
Rapeseed Oil ◽  
Wear Track ◽  
Adhesive Wear ◽  
Tribological Behavior ◽  
Wear Depth ◽  
Dry Conditions ◽  
Oil Films

Amorphous Fe-W alloys with 25 at.% of W were electrodeposited under direct and pulse modes from glycolate-citrate bath with and without addition of polyethylene glycol. The tribological behavior of the coatings was studied at 1, 2 and 5 N loads under dry friction and in the presence of rapeseed oil films of 0.2-5.0 m thickness. The tribological behavior of obtained coatings at dry friction reveals their severe tribo-oxidation resulting in a high wear depth and coefficient of friction. Observed groove like surface with well-adhered particles inside the wear track point out on abrasive-adhesive wear mechanism of Fe-W alloys. In the presence of rapeseed oil films the wear mechanism changes, and values of coefficient of friction decrease up to 10 times compared to dry friction conditions. The optimum thickness of rapeseed oil film was 1 μm. This film has the satisfactory adhesion and uniform distribution on the surface, and could withstand up to 2 000 cycles.

The Effect of Silica Abrasive Particle Sizes in Polyester Based Composite on the Tribological Properties of Ti64

2017 ◽  
Vol 886 ◽  
pp. 69-73
Author(s):  
Myo Minn ◽  
Sylvie Castagne
Keyword(s):  
Polymer Composite ◽  
Coefficient Of Friction ◽  
Wear Track ◽  
Abrasive Particle ◽  
Optical Microscope ◽  
Silica Particles ◽  
Resin Matrix ◽  
Wear Depth ◽  
Particle Sizes ◽  
Surface Features

Investigation of the tribological characteristics of Ti6Al4V (Ti64) was performed by using a pin-on-disc tribometer. Polymer composites composed of a polyester resin matrix and silica abrasives with two different particle sizes were used as the counterface pin material. The macro and micro surface features on the wear track in relation to different abrasive particle sizes were analyzed by using optical microscope and scanning electron microscope. The wear depth was monitored by utilizing surface profiler and the change in hardness of Ti64 was measured by using Vickers hardness tester before and after the test. The effect of sliding speeds on the coefficient of friction was also studied. During sliding against Ti64 substrate, the results showed lower coefficient of friction, smoother surface features, and lower wear rate for the case of the polymer composite pin with smaller silica particles size when compared to that of polymer composite pin with larger silica particles size. The higher sliding speed generated more wear debris, much deeper wear depth, and wider wear track on Ti64 substrate.

Tribological Properties of Mo/NiCrBSi Thermal Spray Deposits

1998 ◽  
Author(s):  
V. Fervel ◽  
B. Normand ◽  
C. Coddet ◽  
M. Delaet
Keyword(s):  
Cast Iron ◽  
Adhesive Wear ◽  
Tribological Behavior ◽  
Optical Microscope ◽  
Atmospheric Plasma ◽  
Wear Process ◽  
Dry Conditions ◽  
Nicrbsi Coating ◽  
The Difference ◽  
Nicrbsi Coatings

Abstract The tribological behavior of Mo/NiCrBSi coatings obtained by atmospheric plasma spray was studied under dry conditions using an Amsler machine. Discussion is made on the effects of the plasma gas mixture and of the preheating of the substrate. The wear process of Mo/NiCrBSi in situation of dry rolling-sliding contact versus cast iron was observed using a profilometer, an optical microscope, and a scanning electron microscope. It was found that the wear mechanism could be divided into two steps : the first one corresponds to an abrasive wear; it results from the difference in hardness between the counter-specimen and the Mo/NiCrBSi coating. The second one corresponds to an adhesive wear resulting from the transfer of cast iron from the counter-specimen to the coating.

scholarly journals Tribological behavior of Ti(C, N)-TiB2 composite cermets using FeCoCrNiAl high entropy alloys as binder over a wide range of temperatures

2020 ◽  
Author(s):  
Zhanjiang Li ◽  
Peixin Fu ◽  
Chenglong Zhu ◽  
Chunfu Hong ◽  
Pinqiang Dai
Keyword(s):  
Wear Resistance ◽  
Wear Mechanism ◽  
Elevated Temperatures ◽  
Adhesive Wear ◽  
Tribological Behavior ◽  
High Hardness ◽  
Wear Performance ◽  
High Entropy ◽  
Wide Range ◽  
Hot Pressing Sintering

Abstract The Ti(C, N)-TiB2 composite cermets with different binders (HEAs or Ni-Co) were fabricated by mechanical alloying and vacuum hot-pressing sintering. Wear resistance of two composite cermets at elevated temperatures was studied. Wear mechanism was characterized by a combination of scanning electron microscopy and energy dispersive spectroscopy. Experimental results indicated that HEAs binder composite cermets possessed excellent wear resistance comparing with Ni-Co binder composite cermets. At lower temperatures, no obvious difference was observed in worn surfaces of two cermets. Abrasive wear mechanism was dominant wear mechanism. At greater than 600 °C, oxidative wear and adhesive wear were found to be dominant wear mechanism. The wear rate of HEAs binder composite cermets was 11.8%, 17%, 39.25%, and 46.7% lower than that of Ni-Co binder composite cermets at 200℃, 400℃, 600℃, and 800℃, respectively. Enhanced wear performance of Ti(C, N)-TiB2-HEAs composite cermets is attributed to relatively high hardness and toughness, as well as excellent high-temperature softening resistance and oxidation resistance of HEAs.

Effect of TiN and TiAlN Coatings on Tribological Properties and Efficiency of Gear

2014 ◽  
Vol 933 ◽  
pp. 159-164 ◽  
Author(s):  
Hui Bo He ◽  
Wen Qiang Han ◽  
Hua Ying Li ◽  
Jun Yang ◽  
Tao Gu
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Tribological Properties ◽  
Wear Mechanism ◽  
Adhesive Wear ◽  
Tribological Behavior ◽  
Energy Dispersive Spectrum ◽  
Ion Plating ◽  
Oxidation Wear ◽  
Scanning Electron

In order to explore the effect of TiN and TiAlN coatings on tribological properties and efficiency of gear, TiN and TiAlN coatings were deposited on 45 steel and the surface of gears by Arc Ion Plating technique. The dry tribological behavior of the substrate and coatings were tested in a ball-on-disk tribometer. The microcosmic morphology of the wear areas were observed by scanning electron microscope and energy dispersive spectrum. The wear mechanism of TiN and TiAlN coatings were investigated to assess the performance of the coatings. The efficiency of uncoated and coated gear was obtained and compared at various input rotating speeds. The results showed that TiN and TiAlN coatings provide a significant decrease of average friction coefficients compared with substrate. The wear mechanisms TiN and TiAlN coatings are mainly abrasive and adhesive wear, accompanied with adhesive and oxidation wear. The efficiency of gear has been significantly enhanced after TiN and TiAlN coatings deposition.

Study on tribological behavior of zinc phosphate impregnated graphite under oil lubrication condition

2021 ◽  
pp. 1-13
Author(s):  
Jianhang Chen ◽  
Siyang Gao ◽  
Peng Wang ◽  
Weihai Xue ◽  
Shu Li ◽  
...  
Keyword(s):  
Wear Rate ◽  
Coefficient Of Friction ◽  
Wear Mechanism ◽  
Friction And Wear ◽  
Zinc Phosphate ◽  
Tribological Behavior ◽  
Oil Lubrication ◽  
Rotating Speed ◽  
Nickel Based Superalloy ◽  
The Coefficient Of Friction

Abstract The tribological behavior of zinc phosphate impregnated graphite against nickel-based superalloy (GH4169) in oil environment was investigated, and the lubrication and wear mechanism were also determined in this study. Tribological tests were run under different tribological conditions using a ring-on-disk device. The results showed that, under any load conditions, zinc phosphate impregnated graphite had the lowest coefficient of friction and wear rate at 200 rpm. Under the identical rotating speed condition, the minimum coefficient of friction and wear rate were obtained when the load was 500 N and 1000 N. The lubrication mechanism, which could be reflected by the transfer layer of friction counterpart, was related to the coefficient of friction, wear rate and oil temperature to affect contact characteristics of two solid surfaces and formation ability of liquid film. The wear mechanism of zinc phosphate impregnated graphite under oil lubrication conditions was dominated by abrasive wear and material removal was achieved through the fracture mechanism.

scholarly journals Effect of Martensite Volume Fraction on Oxidative and Adhesive Wear

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2964
Author(s):  
Yunbo Zhang ◽  
Abdeljalil Jourani
Keyword(s):  
Wear Mechanism ◽  
Dual Phase Steel ◽  
Rate Increase ◽  
Adhesive Wear ◽  
Volume Fraction ◽  
Tribological Behavior ◽  
Normal Load ◽  
Oxidative Wear ◽  
Sliding Velocity ◽  
Martensite Volume Fraction

It is generally known that microstructure can considerably affect the tribological behavior of non-lubricated rubbing. However, there is still a lack of awareness about the effect of microstructure on oxidative wear. The present study focused on the effect of martensite volume fraction (MVF) on oxidative wear by using 25CD4 dual-phase steel. Dry friction tests were performed on a ball-on-flat tribometer with a normal load of 15 N and a mean sliding velocity of 0.013 m/s. Friction coefficient and wear rate increase with the increasing MVF. SEM observation and EDXS analyses of the wear scars showed that the oxidation increases with decreasing MVF. For lower MVF, the main wear mechanism is mild oxidative wear. For higher MVF, severe adhesion is predominant as a wear mechanism. The size of the debris decreases with decreasing MVF.

scholarly journals Simulation and Experimental Study on Wear of U-Shaped Rings of Power Connection Fittings under Strong Wind Environment

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 735
Author(s):  
Songchen Wang ◽  
Xianchen Yang ◽  
Xinmei Li ◽  
Cheng Chai ◽  
Gen Wang ◽  
...  
Keyword(s):  
Abrasive Wear ◽  
Adhesive Wear ◽  
Surface Hardness ◽  
Wear Depth ◽  
Strong Wind ◽  
Wear Model ◽  
Wind Environment ◽  
Simulation Results ◽  
Oxidation Wear ◽  
Good Agreement

The objective of this study was to investigate the wear characteristics of the U-shaped rings of power connection fittings, and to construct a wear failure prediction model of U-shaped rings in strong wind environments. First, the wear evolution and failure mechanism of U-shaped rings with different wear loads were studied by using a swinging wear tester. Then, based on the Archard wear model, the U-shaped ring wear was dynamically simulated in ABAQUS, via the Umeshmotion subroutine. The results indicated that the wear load has an important effect on the wear of the U-shaped ring. As the wear load increases, the surface hardness decreases, while plastic deformation layers increase. Furthermore, the wear mechanism transforms from adhesive wear, slight abrasive wear, and slight oxidation wear, to serious adhesive wear, abrasive wear, and oxidation wear with the increase of wear load. As plastic flow progresses, the dislocation density in ferrite increases, leading to dislocation plugs and cementite fractures. The simulation results of wear depth were in good agreement with the test value of, with an error of 1.56%.

scholarly journals Adhesive wear mechanism under combined electric diamond grinding

2017 ◽  
Vol 129 ◽  
pp. 01002 ◽  
Author(s):  
Vyacheslav Popov ◽  
Pavel Arkhipov ◽  
Daniel Rychkov
Keyword(s):  
Wear Mechanism ◽  
Adhesive Wear ◽  
Diamond Grinding
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