scholarly journals Effects of Different Materials on the Tribological Performance of PVD TiN Films under Starved Lubrication Regime

2018 ◽  
Author(s):  
Dong Jiang ◽  
Xiaoming Gao ◽  
Ming Hu ◽  
Desheng Wang ◽  
Yanlong Fu ◽  
...  
Keyword(s):  
Tribological Performance ◽  
Tin Films ◽  
Lubrication Regime ◽  
Starved Lubrication

Pristine and Alkylated MoS2 Nanosheets for Enhancement of Tribological Performance of Paraffin Grease Under Boundary Lubrication Regime

2019 ◽  
Vol 141 (7) ◽  
Author(s):  
Sooraj S. Rawat ◽  
A. P. Harsha ◽  
Deepak P. Agarwal ◽  
Sangita Kumari ◽  
Om P. Khatri
Keyword(s):  
Coefficient Of Friction ◽  
Tribological Performance ◽  
Wear Volume ◽  
Mos2 Nanosheets ◽  
Lubricating Grease ◽  
Metal Soap ◽  
Paraffin Oil ◽  
Lubrication Regime ◽  
The Coefficient Of Friction ◽  
Worn Surface

In the present study, lubricating grease was developed with paraffin oil and 12-lithium hydroxy stearate metal soap as a thickening agent. MoS2 nanosheets were synthesized by hydrothermal method and functionalized with 1-octadecanethiol (i.e., MoS2-ODT). The MoS2 and MoS2-ODT nanosheets were dispersed in the grease with different concentrations to evaluate its tribological performance. Tribological results unveiled that the addition of MoS2 nanosheets in grease appreciably reduced the coefficient of friction and mean wear volume of tribo-interfaces as compared with pure grease. Energy dispersive spectroscopy (EDS) spectrum revealed the deposition of MoS2 on the worn surface and confirmed a thin tribo-film which protects steel tribo-pair against wear.

Film Thickness Modulations in Starved Elastohydrodynamically Lubricated Contacts Induced by Time-Varying Lubricant Supply

2008 ◽  
Vol 130 (4) ◽  
Author(s):  
C. H. Venner ◽  
G. Popovici ◽  
P. M. Lugt ◽  
M. Organisciak
Keyword(s):  
Film Thickness ◽  
Numerical Simulations ◽  
Simple Formula ◽  
Load Condition ◽  
Time Varying ◽  
Practical Applications ◽  
Lubricated Contacts ◽  
Lubrication Regime ◽  
Starved Lubrication ◽  
Load Conditions

Many elastohydrodynamically lubricated contacts in practical applications, e.g., in bearings, operate in the starved lubrication regime. As a result their performance is sensitive to variations of the lubricant layers present on the surfaces, which form the supply to the contact. Their shape is often determined by previous overrollings of the track and also by replenishment mechanisms and various migration effects. Variations of the layers induced in the direction of rolling lead to a time-varying lubricant supply to the contact. In this paper, by means of numerical simulations using a starved lubrication model, the film thickness modulations in the center of the contact induced by a harmonically varying inlet supply have been investigated. First, for a given load condition and layer wavelength, the effect of the nominal layer thickness (degree of starvation) and the layer variation amplitude is illustrated. Subsequently, using results for different load conditions, wavelengths, and degrees of starvation, it is shown that the response of the contact to such variations is determined by a nondimensional parameter, which represents the ratio of the entrainment length of the contact to the wavelength of the induced variation, and by the degree of starvation. A simple formula is presented for use in engineering predicting the ratio of the amplitude of the film modulations in the center of the contact to the amplitude of the layer variations in the inlet.

Tribological study of multi-scale textured parallel sliding contacts by considering a mixed lubrication regime and mass conservation condition

2021 ◽  
pp. 135065012110455
Author(s):  
Ramana Reddy Annadi ◽  
Ismail Syed
Keyword(s):  
Tribological Performance ◽  
Mixed Lubrication ◽  
Fluid Film ◽  
Tribological Characteristics ◽  
Sliding Contacts ◽  
Film Pressure ◽  
Surface Textures ◽  
Multi Scale ◽  
Lubrication Regime ◽  
Mixed Lubrication Regime

Surface texturing is a viable technique to enhance the tribological performance of sliding interacting contacts. Single-scaled surface textures exhibit better tribological performance only at hydrodynamic lubrication regime (fluid film pressure) but not in mixed lubrication regime where fluid film pressure and asperity contact pressure co-exists. In most of the machinery with the increase in load and/or decrease in speed, there is a shift of lubrication regime from hydrodynamic to mixed lubrication. To address this, the present work proposed a multi-scale (a combination of shallow and deep) textures concept. A numerical model is developed to study its effect on the tribological characteristics of parallel sliding contacts by considering mixed lubrication regime and mass-conservative cavitation condition. It has been observed that multi-scaled textures exhibit superior results in comparison with single-scaled textures. Moreover, improved tribological characteristics are observed when shallow surface textures are placed first towards the fluid inlet flow.

scholarly journals Advanced Tribological Characterization of DLC Coatings Produced by Ne-HiPIMS for the Application on the Piston Rings of Internal Combustion Engines

2021 ◽  
Vol 11 (21) ◽  
pp. 10498
Author(s):  
Alireza Vahidi ◽  
Diogo Fonseca ◽  
João Oliveira ◽  
Albano Cavaleiro ◽  
Amílcar Ramalho ◽  
...  
Keyword(s):  
Internal Combustion Engines ◽  
Hydrodynamic Lubrication ◽  
Research Work ◽  
Internal Combustion ◽  
Tribological Performance ◽  
Combustion Engines ◽  
Piston Rings ◽  
Dlc Coatings ◽  
Lubrication Regimes ◽  
Lubrication Regime

Piston rings (PR) are known for almost a quarter of the friction losses in internal combustion engines. This research work aims to improve the tribological performance of PR by a recently developed variant of Diamond-like Carbon (DLC) coatings deposited in a mixture of Ar and Ne plasma atmosphere (Ne-DLC) by high-power impulse magnetron sputtering (HiPIMS). For the benchmark, the widely used Chromium Nitride (CrN) and DLCs deposited in pure Ar plasma atmosphere (Ar-DLC) were used. The tribological tests were performed on a block-on-ring configuration under different lubrication regimes by varying temperatures and sliding speeds. The analysis of the results was performed by Stribeck curves corresponding to each sample. An improvement of the tribological performance was observed for Ne-DLC films by up to 22.8% reduction in COF compared to CrN in the boundary lubrication regime, whereas, for the Ar-DLC film, this reduction was only 9.5%. Moreover, the Ne-DLC films achieved ultralow friction of less than 0.001 during the transition to a hydrodynamic lubrication regime due to better wettability (lower contact angle) and higher surface free energy. Increasing the Ne up to 50% in the discharge gas also leads to an increase of hardness of DLC films from 19 to 24 GPa.

Tribological performance of GLC, WC/GLC and TiN films on the carburized M50NiL steel

2019 ◽  
Vol 361 ◽  
pp. 1-8 ◽  
Author(s):  
Zeqing Li ◽  
Honghong Zhang ◽  
Weifeng He ◽  
Lei Xu ◽  
Guang'an Zhang ◽  
...  
Keyword(s):  
Tribological Performance ◽  
Tin Films

Electron microscopy study of reactively sputter-deposited Ti/N films on silicon

1992 ◽  
Vol 50 (2) ◽  
pp. 1362-1363
Author(s):  
V. C. Kannan ◽  
A. K. Singh ◽  
R. B. Irwin ◽  
S. Chittipeddi ◽  
F. D. Nkansah ◽  
...  
Keyword(s):  
Integrated Circuits ◽  
Large Scale ◽  
Hexagonal Phase ◽  
Microscopy Study ◽  
Electron Microscopy Study ◽  
Process Conditions ◽  
Tin Films ◽  
Wide Range ◽  
Fcc Phase ◽  
Circuits Vlsi

Titanium nitride (TiN) films have historically been used as diffusion barrier between silicon and aluminum, as an adhesion layer for tungsten deposition and as an interconnect material etc. Recently, the role of TiN films as contact barriers in very large scale silicon integrated circuits (VLSI) has been extensively studied. TiN films have resistivities on the order of 20μ Ω-cm which is much lower than that of titanium (nearly 66μ Ω-cm). Deposited TiN films show resistivities which vary from 20 to 100μ Ω-cm depending upon the type of deposition and process conditions. TiNx is known to have a NaCl type crystal structure for a wide range of compositions. Change in color from metallic luster to gold reflects the stabilization of the TiNx (FCC) phase over the close packed Ti(N) hexagonal phase. It was found that TiN (1:1) ideal composition with the FCC (NaCl-type) structure gives the best electrical property.

Tribological Performance and Action Mechanism of Cadmium Dialkyldithiophosphate

2005 ◽  
Vol 48 (2) ◽  
pp. 171-175 ◽  
Author(s):  
Hu Jianqiang ◽  
Wei Xianyong ◽  
Yao Junbing ◽  
Xie Feng ◽  
Zhu Huanqin ◽  
...  
Keyword(s):  
Tribological Performance ◽  
Action Mechanism

Preparation of TiN Films by Magnetron Sputtering and Diagnostics for Optical Emission of Magnetron Plasma.

Shinku ◽  
1995 ◽  
Vol 38 (3) ◽  
pp. 339-342 ◽  
Author(s):  
Yasuki AIHARA ◽  
Yuko HIROHATA ◽  
Tomoaki HINO ◽  
Toshiro YAMASHINA
Keyword(s):  
Magnetron Sputtering ◽  
Optical Emission ◽  
Tin Films
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