scholarly journals Thermal Behavior of Frictional Properties on Ultra-Thin Perfluoropolyether Lubricant Film

2016 ◽  
Vol 11 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Hiroshi Tani ◽  
Shinji Koganezaw ◽  
Norio Tagawa
Keyword(s):  
Thermal Behavior ◽  
Lubricant Film ◽  
Frictional Properties ◽  
Perfluoropolyether Lubricant

scholarly journals Dependence of Pin Surface Roughness for Friction Forces of Ultrathin Perfluoropolyether Lubricant Film on Magnetic Disks by Pin-on-Disk Test

2012 ◽  
Vol 2012 ◽  
pp. 1-7
Author(s):  
H. Tani ◽  
Y. Mitsuya ◽  
T. Kitagawa ◽  
N. Tagawa
Keyword(s):  
Surface Roughness ◽  
Ion Beam ◽  
Lubricant Film ◽  
Friction Forces ◽  
Magnetic Disks ◽  
End Groups ◽  
Cluster Ion ◽  
Perfluoropolyether Lubricant ◽  
Gas Cluster Ion Beam ◽  
Pin On Disk

We fabricated supersmooth probes for use in pin-on-disk sliding tests by applying gas cluster ion beam irradiation to glass convex lenses. In the fabrication process, various changes were made to the irradiation conditions; these included one-step irradiation of Ar clusters or two-step irradiation of Ar and N2clusters, with or without Ar cluster-assisted tough carbon deposition prior to N2irradiation, and the application of various ion doses onto the surface. We successfully obtained probes with a centerline averaged surface roughness that ranged widely from 1.08 to 4.30 nm. Using these probes, we measured the friction forces exerted on magnetic disks coated with a molecularly thin lubricant film. Perfluoropolyether lubricant films with different numbers of hydroxyl end groups were compared, and our results indicated that the friction force increases as the surface roughness of the pin decreases and that increases as the number of hydroxyl end groups increases.

Pulsed UV-laser-induced chemistry of perfluoropolyether lubricant film

2002 ◽  
Vol 75 (5) ◽  
pp. 633-636 ◽  
Author(s):  
L. Zhu ◽  
T. Liew ◽  
T.C. Chong
Keyword(s):  
Lubricant Film ◽  
Uv Laser ◽  
Perfluoropolyether Lubricant

scholarly journals Analytical modeling of the thermal behavior of a thin lubricant film under nonlinear conditions

2017 ◽  
Vol 21 (1 Part A) ◽  
pp. 117-124
Author(s):  
Najib Laraqi ◽  
Cyril Lamriben ◽  
Ali Hocine ◽  
Zsolt Peter ◽  
Abderezak Hamouda
Keyword(s):  
Thermal Behavior ◽  
Finite Difference Methods ◽  
Viscosity Coefficient ◽  
Lubricant Film ◽  
Solid Surfaces ◽  
Effect Of Temperature ◽  
Mechanical Transmission ◽  
Wide Field ◽  
Local Pressure ◽  
Energy Equations

Lubrication is an important phenomenon in a wide field of industry such as automotive, aerospace, mechanical transmission systems and many others. The viscosity of fluid is a determining factor in the thermal behavior of lubricant and solid surfaces in friction. In practice the viscosity varies strongly as a function of local pressure and temperature. In this study we are interested in the effect of temperature on the viscosity and the thermal behavior of the lubricant. We solve the dynamic and energy equations under nonlinear conditions considering that the viscosity decreases following an exponential law of the temperature as it is known in the literature, ? = ?0 e-? (T-T0). The analytical solution is compared to a numerical modeling using a finite difference methods. The results show an excellent agreement. We analyse the effect of the viscosity coefficient, ?, on the velocity and the temperature in the thin lubricant film.

Hybrid Lubricant Film With High Bonding Ratio and High Coverage

2019 ◽  
Author(s):  
Hiroshi Tani ◽  
Yuki Uesaraie ◽  
Renguo Lu ◽  
Shinji Koganezawa ◽  
Norio Tagawa
Keyword(s):  
Frictional Coefficient ◽  
Chemical Vapor ◽  
Lubricant Film ◽  
High Coverage ◽  
Frictional Properties ◽  
Bonding Ratio ◽  
Pfpe Lubricant ◽  
Coated Film ◽  
Mobile Fraction ◽  
Pin On Disk

Abstract The frictional properties of a hybrid lubricant film composited from perfluoropolyether (PFPE) lubricant (Moresco DDOH) with single end group and PFPE film deposited from HT170 (Solvay) via photoelectron-assisted chemical vapor deposition (PACVD) were evaluated using a pin-on-disk tester and compared with that of a Z-tetraol dip-coated film. The frictional coefficient of only the HT170 film deposited via PACVD was considerably high; however, the hybrid lubricant film without the mobile fraction showed a friction coefficient equivalent to that of the Z-tetraol film with a mobile fraction of 40%.

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