Lubrication and failure mechanisms of graphite fluoride films
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National Aeronautics and Space Administration, Scientific and Technical Information Office, for sale by the National Technical Information Service , Washington, Springfield, Va
Fluorides., Graphite -- Testing., Solid lubricants -- Testing., Mechanical wear -- Measurement., Friction -- Ta
|Statement||Robert L. Fusaro.|
|Series||NASA technical paper ; 1197, NASA technical paper -- 1197.|
|Contributions||United States. National Aeronautics and Space Administration. Scientific and Technical Information Office.|
|The Physical Object|
|Pagination||29 p. :|
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LUBRICATION AND FAILURE MECHANISMS OF GRAPHITE FLUORIDE FILMS by Robert L Fusaro Lewis Research Center SUMMARY An optical microscope, equipped with a vertical illuminator and two Polaroid filters (one rotatable), was used to visually study the sliding surfaces of C HT steel lubri- cated with rubbed films of graphite Size: 2MB.
Lubrication and failure mechanisms of graphite fluoride films. Washington: National Aeronautics and Space Administration, Scientific and Technical Information Office ; Springfield, Va.: For sale by the National Technical Information Service, (OCoLC) Material Type: Government publication, National government publication.
Thus a failure mechanism for the graphite fluoride films appears to be the depletion of the lubricant from the contact zone by flowing laterally outward. This was followed by the excessive production of metallic debris, which combined with the remaining graphite fluoride to form a Cited by: Lubrication and failure mechanisms of graphite fluoride films / By Robert L.
Fusaro and United States. National Aeronautics and Space Administration.
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Scientific and Technical Information Office. Abstract. Issued Apr. Includes bibliographical of access: Internet. The mechanisms of failure were found to be somewhat different, however. Failure of MoS2 films was very dependent on atmospheric degradation, while that of graphite fluoride films was more dependent on flow of the lubricant film out of the contact zone.
Purchase Mechanics and Chemistry in Lubrication - 1st Edition. Print Book & E-Book. ISBNThe Meaning of Film Failure Electrical Methods of Detecting Film Failure Graphite Fluoride as a Solid Lubricant Boron Nitride as a Solid LubricantBook Edition: 1.
Results are presented for the bonding of thin, sintered, fluoride films of BaF 2 and CaF 2 with mono-aluminum phosphate. Friction and wear behavior of these films has been defined in terms of film compositional changes, film curing procedures, and substrate variations when subjected to varying levels of temperature and by: 6.
A microscopic study of C steel sliding surfaces lubricated by graphite fluoride or molybdenum disulfide solid lubricant rubbed films was conducted. Surface deterioration leads to the production of wear particles by a series of events characterized by adhesion and particle transfer mechanisms or by a process of direct particle production akin to machining or, in certain cases, a surface fatigue form of failure.
These three mechanisms are referred to as adhesive, abrasive, and fatigue wear, and are the three most important. Lubrication and lubricants are the most important aspect for running a machine without giving pre-matured failure.
It is also used to minimize power loss, heat generation, wear and tear of Author: Suraj Kumar Vishwakarma. The mechanisms of failure were found to be somewhat different, however. Failure of MoS2 films was very dependent on atmospheric degradation, while that of graphite fluoride films was more dependent on flow of the lubricant film out of the contact zoneAuthor: R.
Fusaro. Electrochemical fluorination in hydrogen fluoride solution. Fluorination by fluorine gas. Fluorination in the presence of graphite fluoride.
Lubricative Property of Graphite Fluoride. Graphite fluoride as a solid lubricant. Lubricity of (CF)n - co-deposited metal film. Graphite Intercalation Compound of Fluorine. Preparative method of Edition: 1. on the friction and wear properties of graphite fluoride.
Description Lubrication and failure mechanisms of graphite fluoride films FB2
They found that, by adding 2-percent graphite fluoride to a lithium soap - diester grease, low friction could be at-tained at temperatures up to ° C. The grease alone or with graphite added failed at ° C.
They also tested graphite fluoride in a silicate binder and in an epoxy-phenolicFile Size: KB. Lubrication and wear mechanisms of polymide-bonded graphite fluoride films subjected to low contact stress (Book, )  Get this from a library.
Lubrication and wear mechanisms of polymide-bonded graphite fluoride films subjected to low contact stress. [Robert L. The main wear mechanism of the test specimens are fatigue wear and adhesive wear.
The solid lubrication film for graphite fluoride was formed in the friction surface. The formation and lubrication mechanism of boundary lubricating film were discussed.
The temperature is regarded as a judge criterion for failure of boundary lubrication. The chemical reaction film is made by the reaction between metal and extreme pressure additive in base oil, and the anti-wear capability is realized by the low-melting point eutectic alloy.
The temperature is regarded as a judge criterion for failure of boundary lubrication. The failure model for boundary lubricating film is established.
MECHANISM OF LUBRICATION-: MECHANISM OF LUBRICATION- Considering the nature of motion between moving or sliding surfaces, there are different types of mechanisms by which the lubrication is done.
They are: Hydrodynamic lubrication or thick film lubrication. Hydrostatic lubrication. Boundary lubrication or thin film lubrication. molybdenum disulfide and graphite are also effective.
Load  Atmosphere: Gas (oxygen, etc.) Water, contaminants, etc. Motion  Lubricants: Lubricating oils Additives Solid  Solid  Wear mechanism  and  Viscous oil film Adsorption film Tribological chemical reaction product film Solid lubricant. Lubricant-related failures can be avoided by selecting a grease or oil that generates a sufficient film to keep bearing elements separated.
A good lubricant also provides good boundary lubrication. Lubricant failures can be detected by the presence of discolored (blue/brown) raceways and rolling : Noria Corporation.
Dry lubricants or solid lubricants are materials that, despite being in the solid phase, are able to reduce friction between two surfaces sliding against each other without the need for a liquid oil medium.
The two main dry lubricants are graphite and molybdenum disulfide. They offer lubrication at temperatures higher than liquid and oil-based lubricants operate.
Dry lubricants are often used in applications such as locks or dry lubricated bearings. Tribology of Solid Lubricants. Authors; Authors and affiliations United States National Aeronautics and Space Administration, Scientific and Technical Information Office () Lubrication and failure mechanisms of molybdenum disulfide films.
Sliney HE () Lubricating characteristics of polyimide bonded graphite fluoride and Cited by: MoS2 lubrication performance often exceeds that of graphite and is effective in vacuum as well whereas graphite does not.
The temperature limitation of MoS 2 at ºC is restricted by oxidation. The particle size and film thickness are important parameters that should be matched to the surface roughness of the substrate.
Graphite Fluoride as a Solid Lubricant in a Polyimide Binder [Robert L. Fusaro] on *FREE* shipping on qualifying offers. Graphite Fluoride as a Solid Lubricant in a Polyimide BinderAuthor: Robert L. Fusaro. Fluorinated amorphous carbon films exhibit superlow friction under vacuum, but are prone to catastrophic failure.
Thus far, the intrinsic failure mechanism remains unclear. A Cited by: Bonded solid lubrication coatings are composed of one or more solid lubricants (e.g., MoS 2, graphite, PTFE) and other additives dispersed in an organic or inorganic binder, diluted with a solvent, then sprayed, dipped, or brushed onto a substrate, and cured to form a “bonded” solid film lubricant.
Abstract: Fluorine gas was produced with the electrolysis of the molten salt KF2HF, then graphite fluoride was prepared through the reaction between graphite powder and fluorine gas at ℃.
The real density of the graphite fluoride was g/cm^3, its electrical.
Details Lubrication and failure mechanisms of graphite fluoride films FB2
subseqGent catastrophLc failure. Ball bearings depend on the continuous presence-of a very thin-millionths of an inch-film of lubricant between balls and races, and between the cage, bearing rings, I.
and balls. Failures are typically i caused by restricted lubricant flow or excessive temperatures that degrade the lubricant's properties. However, if the right grease, sealing system and/or lubrication system are chosen, then grease lubrication offers clear benefits.
This article, based on a new book written by SKF engineers , summarizes aspects of grease lubrication mechanisms in rolling bearings. A study was conducted on the lubricating properties of organopolysiloxane-bonded graphite fluoride (CF sub ) sub n films.
The effects of temperature, atmosphere, composition of organopolysiloxane, and burnishing additional (CF sub ) sub n powder onto the film surface were studied. Our graphite fluoride is produced by a high-temperature reaction between fluorine gas and pyrolytic carbon, charcoal, or graphite powder.
[+] Read more Even under harsh conditions that expose it to high loads and temperatures, graphite fluoride maintains its lubrication stability and water repellency. This article begins with a historical overview of solid lubricants and discuses the characteristics and fundamental aspects of solid lubricants.
It describes the material categories of solid lubricant coatings, including graphite, graphite fluoride, transition metal dichalcogenides, diamond-like-carbon, polymeric materials, and metallic films. "This outstanding reference presents the latest scientific findings concerning the synthesis, structure, thermodynamics, and physical and chemical properties of fluorine- and fluoride-carbon compounds elucidating their practical applications in lithium batteries, superhydrophobic composites, and the electrolytic production of elemental fluorine.".Fluorographene (or perfluorographane, graphene fluoride) is a fluorocarbon derivative of graphene.
It is a two dimensional carbon sheet of sp 3 hybridized carbons, with each carbon atom bound to one chemical formula is (CF) comparison, Teflon (polytetrafluoroethylene), -(CF 2) n- consists of carbon "chains" with each carbon bound to two al formula: CF).
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