Enhancement of perfluoropolyether boundary lubrication performance



Publisher: National Aeronautics and Space Administration, Publisher: National Technical Information Service, distributor in [Washington, D.C.], [Springfield, Va

Written in English
Published: Downloads: 471
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Subjects:

  • Ball bearings.,
  • Boundary lubrication.,
  • Lubricants.,
  • Perfluoro compounds.,
  • Polytetrafluoroethylene.,
  • Spacecraft lubrication.

Edition Notes

elastohydrodynamic lubrication. Keywords: tribology, perfluoropolyethers (PFPE), surface tension, contact angle lubrication 1. Introduction Many changes in construction of mechanical vehicles and other machines, and technical equipment took place with the years. Because of this fact the demands for lubricating substances were redefined. M. Abdul Samad and Sujeet K. Sinha, “Nanocomposite UHMWPE-CNT polymer coatings for boundary lubrication on Al substrates” Tribology Letters, 38(), p. – M. Abdul Samad and Sujeet K. Sinha, “Dry sliding and boundary lubrication performance of a UHMWPE/CNTs nanocomposite coating on steel substrates at elevated temperatures. performance at low levels of seal leakage (emissions). 2. Mechanical Seal – Reliability Driver, Sealing Interface Lubrication Although complex analytical methods are required and used in the performance, reliability enhancement of modern high performance seals and the development of new technologies, the fundamental principle of how a. Perfluoropolyether is listed in the World's largest and most authoritative dictionary database of abbreviations and acronyms. Kato, "Vapor deposition of perfluoropolyether lubricant on fluorinated diamondlike carbon surface," Journal of Applied Physics, vol.

Our full list of Perfluoropolyether (PFPE) chemistries for use in the elastomer industry with further categorization by end market, functions and process. 8/8/ PM . Adoption of premium quality lubricants for better functioning of the air crafts and automobiles. Perfluoropolyether Market size exceeded USD million, globally in and is estimated to grow over 4% CAGR between and Get more details on this report - Request Free Sample PDF Perfluoropolyether (PFPE) is a nonreactive and non-flammable fluorinated synthetic oil. The effects of acid passivation, tricresyl phosphate presoak, and UV/ozone treatment on the tribology of perfluoropolyether-lubricated C stainless steel couples. Journal of Synthetic Lubrication. Y VAC 3 - Lubrication of mechanical parts operating at high vacuum in contact with aggressive chemicals or oxygen OT 20 - Lubrication of mechanical parts subjected to low loads UT 18 - Lubrication of mechanical parts used in wide temperature intervals RT 15 - Lubrication of mechanical parts requiring boundary (extreme pressure) YNX - Suitable.

1, perfluoropolyether products are offered for sale by suppliers on , of which lubricant accounts for 2%, hair care chemical raw material accounts for 1%, and motor driver accounts for 1%. A wide variety of perfluoropolyether options are available to you, such as industrial lubricant.   Classical reactive molecular dynamics (RMD) simulation was used to model the thermal decomposition of perfluorodimethyl ether ([3][3]) in the temperature range from K ([degrees]C) to K ([degrees]C), which is relevant as asimple molecule containing the necessary architectural elements to study the chemical stability of perfluoropolyether lubricants [46]. 'Investigation of alternative lubricants for vapour-phase lubrication' 'Metal matrix composites and their wear behaviour' 'Interfacial chemistry of a perfluoropolyether lubricant studied by XPS and TDS' 'Determination of the thermal stability of perfluoralkylethers' 'Tribological performance of perfluoropolyethers for space applications'.   Sinha S K, Kawaguchi M, Kato T and Kennedy F E Wear durability studies of ultra-thin perfluoropolyether lubricant on magnetic hard disks Tribol. Int. 36 Crossref Google Scholar.

Enhancement of perfluoropolyether boundary lubrication performance Download PDF EPUB FB2

Additional Physical Format: Online version: Jones, W.R. Enhancement of perfluoropolyether boundary lubrication performance (OCoLC) Material Type.

Additional Physical Format: Microfiche version: Jones, W.R. Enhancement of perfluoropolyether boundary lubrication performance (OCoLC) Material Type. Enhancement of Perfluoropolyether Boundary Lubrication Performance.

By L. Wedeven, O. Ajayi and Jr. Jones. Abstract. A ball bearing simulator operating under starved conditions was used to perform screening tests to evaluate the boundary lubrication performance of a branched perfluoropolyether (PFPE), K AB.

Several approaches. A ball bearing simulator operating under starved conditions was used to evaluate the boundary lubrication performance of a perfluoropolyether (PFPE) Krytox AB. Several approaches to enhance boundary lubrication were studied. Perfluoropolyether fluids are not thickened with conventional thickeners but greases can be formulated with 10 to 20 wt.

% of high melting fluorocarbon telomers giving a NLGI consistencies Such greases combine good lubricating properties with a wide temperature range performance and solvent resistance4. 3 5 TO' 5 LOAD (Kg) Fig. by:   Single-Chain Conformational Analysis on the Dynamic Main Chain Expansion of a Tethered Perfluoropolyether Boundary Lubricant Film.

Tribology Letters43 (2), DOI: /s Jihye Lee, Sang-Wook Chun, Ho-Jong Kang, Frank E. Talke. The boundary-lubrication performance of perfluoropolyether (PFPE) thin films in the presence of passivated C stainless steel is presented. The study utilized a standard ball-on-disc tribometer.

Sadeghi, in Tribology and Dynamics of Engine and Powertrain, Boundary lubrication. In boundary lubrication, the rolling and sliding bodies are separated only by a few layers of molecules and the film varies in thickness from 1 to a few tens of nanometres (see also Chapter 3).Boundary lubrication exists when a fluid film cannot be formed or sustained due to heavy loads, low running.

Perfluorinated (PFPE) Lubricants - Perfluorinated lubricants represent a complete range of oils and greases intended for applications where extreme resistance and life time are necessar.

The tribological properties of some novel single component perfluoropolyether (PFPE) boundary lubricants with chemically integrated mixture end groups are investigated.

Chemically integrated mixture end groups composed of hydroxyl- and anisole-terminated PFPE boundary lubricant films on the –(CF 2 CF 2 CF 2 O)– main chain are reported. Spectroscopic Analysis of Perfluoropolyether Lubricant Degradation During Boundary Lubrication The degradation of a branched perfluoropolyether (PFPE) under boundary lubrication conditions was studied using mu-FTIR and mu-Raman spectroscopies.

Stainless steel (C) discs coated with thin (A), uniform films of the PFPE were tested in a ball-on-disc apparatus until various. Lubrication reduces friction between the moving surfaces or rolling pairs. Some of the various types include hydrodynamic, hydrostatic, boundary and extreme pressure lubrication.

The lubricant also act as a coolant carrying heat away from the sliding surfaces so it is necessary for all the moving parts in machinery or engine operation. Perfluoropolyether (PFPE) is a type of liquid lubricant used in the aerospace industry for over 30 years. The main properties of PFPE are being temperature resistant between and K (depending on specific composites), having very low outgassing compared to other fluids (vapour pressure of 6 × 10 −8 Torr) and having a dielectric.

Engineering Tribology - by John Williams January Introduction. The satisfactory operation of both hydrostatic and hydrodynamic bearings requires that the solid surfaces which constitute the bearing faces are completely separated by the intervening fluid film. Ultrathin Perfluoropolyether Films—Influence of Anchoring and Mobility of Polymers on the Tribological Properties was measured in sliding contact and lubricant loss was studied simultaneously by scanning microellipsometry.

The tribological investigations showed that the lifetime of the surfaces with the attached boundary lubricant was.

mechanisms. Perfluoropolyether (PFPE) is one such lubricant, and many studies have already reported on its lubrication performance in space []. Multiplyalkylatedcyclopentane (MAC) is also a liquid lubricant used in space mechanisms, and its lubrication performance has.

A good boundary boundary film physisorption chemisorption lubricant should have a high degree of interaction between its molecules and the solid surface.

As a general rule, liquids are good lubricants when they are polar and thus able to grip solid surfaces perfluoropolyether (PFPE) (or.

Improved hydrodynamic performance of liquid film seal by considering boundary slip and cavitation Yun-Lei Wang, Jiu-Hui Wu, Mu-Ming Hao, Lu-Shuai Xu. The purpose of this paper is to investigate the effect of boundary slip on hydrodynamic performance of liquid film seal considering cavitation.

Improving the tribological properties of water by adding nanomaterials as water-based lubricant additive has garnered increasing interest for the great potential in range of water-based applications. However, combining ideally two-dimensional layered nanomaterials and zero-dimensional nanoparticles to create synergistic enhancement of lubricating performance under water is still challenging.

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Abstract—In disk drive technology, lubricant thickness and roughness are important, but often overlooked, contributors to slider–disk spacing.

In this paper, we use X-ray reflectivity to measure the thickness and lubricant–air roughness of a perfluoropolyether lubricant (Fomblin Zdol) on silicon wafers and. To protect the interface against intermittent head–disk contact in hard disk drives, nanometer-thick perfluoropolyether (PFPE) films consisting of both “bonded” and “mobile” molecules are applied on the disk surfaces.

Because of their different adsorption states and mobility, the bonded and mobile molecules are supposed to contribute differently to friction properties, which directly. Perfluoropolyether (PFPE) glycerol emulsions were prepared.

Three different green surfactants (AES (sodium laureth sulfate), APG (alkyl polyglycoside), and SDS (sodium dodecyl sulfate)) were chosen to emulsify the PFPE. Their properties and performance in shampoo were also investigated.

Centrifuge stability measurements show that three PFPE emulsions have good stability. To ensure the reliability and durability of the head-disk interface of magnetic disk drives, the lubricant film flow coated on the disk surface has become a significant concern because it is related to recovery performance when the film is damaged.

In this study, the replenishment characteristics of perfluoropolyether (PFPE) polar lubricant films after lubricant depletion induced by a glass. 1. A method of increasing the performance of a composite lubricant material when utilized as a thin film lubricant, which method comprises steps of: (a) providing a substrate including at least one surface; (b) providing a composite lubricant comprising a mixture of at least one perfluoropolyether compound and at least one phosphite or phosphate compound; (c) applying a.

In current information storage devices, molecularly-thin lubricant films, e.g., perfluoropolyether (PFPE) series are dip-coated onto various carbon overcoats for hard disk drives' reliability and lubrication [1]. Perfluoropolyether Lubricants (PFPEs) The perfluoropolyether lubricant line saw its beginnings in the commercial market in when it was marketed as a lubricant with low thermal stability and low vapor pressures at low molecular weights.

In this dissertation, perfluoropolyether lubricant transfer and lubricant fragmentation at the head-disk interface are investigated numerically as a function of temperature, local pressure change, and disk velocity. Molecular dynamics is used to study the effect of laser pulse peak power, pulse duration, and repetition rate on lubricant depletion.

Abstract: PFPE (Perfluoropolyether) is a clear colorless fluorinated synthetic oil that is nonreactive, nonflammable, safe in chemical and oxygen service, and is long lasting. the lubricant of choice in chemical and nuclear facilities. The above unique performance of PFPE is due to it's excellant low temperature property.

They are composed of a hydrocarbon aryl component (for lubrication improvement) and a fluorinated side chain (for solubility enhancement). The two moieties are joined by an ester linkage.

Five boundary additives were evaluated in a perfluoropolyether basestock (Fomblin Z25) using a specially designed four-ball apparatus. @article{osti_, title = {Improved surface adhesion and coverage of perfluoropolyether lubricants following far-UV irradiation}, author = {Saperstein, D D and Lin, L J}, abstractNote = {Far-UV treatment of a surface with a thin film of a perfluoropolyether improves adhesion and lowers surface free energy substantially compared to the unirradiated, lubricated surface.

These PFPE (perfluoropolyether) based technologies provide ultimate lubrication performance for a variety of applications in the transportation industry. B 11/9/ AM.USA US07/, USA USA US A US A US A US A US A US A US A US A US A Authority US United States Prior art keywords perfluoropolyether solids solid oxide grease Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.

Jones et al.; “Enhancement of Perfluoropolyether Boundary Lubrication Performance”; Journal of the Society of Tribologists and Lubrication Engineers; Lubrication Engineering, Jun.pp.