Lubrication Properties of Polyalphaolefin and Polysiloxane Lubricants: Molecular Structure–Tribology Relationships
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Polydimethylsiloxane
Boundary lubrication
Viscosity index
Lubricity
Branching (polymer chemistry)
A study was undertaken to analyse results obtained with the HFRR instrument by identifying crucial factors contributing to friction and wear mechanisms. For lubricated tests a mixture of n-hexadecane (cetane) as base fluid and palmitic acid as lubricity additive was used. Experimental results, including results obtained by running unlubricated (dry) tests and results obtained from literature were all considered to formulate the hypothesis that a fully functional additive film will not survive the full duration of the lubricity test, which is 75 minutes [5]. Friction values obtained in the experiments conducted were much higher than what is expected for boundary films formed by long chain carboxylic acids. Comparable friction values were obtained in the first few seconds of the tests, but the friction values increased indicating the destruction of the boundary film. Metal oxide lubrication dominates for the remainder of the test.
Lubricity
Cetane number
Boundary lubrication
Friction modifier
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Lubricity
Boundary lubrication
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Lubricity
Boundary lubrication
Hydrocarbon mixtures
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Lubricity
Grease
Boundary lubrication
Ball (mathematics)
Dry lubricant
Friction modifier
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Abstract Boundary oil films can be transformed into reacted films during an extremely short period of time under certain conditions of reactive dynamics. A comprehensive index R is introduced to characterise the producibility and lubricity of the reacted films. Index R, which is calculated using maximum and minimum friction coefficients in the formation process of the reacted films as well as from the reacting and maintaining periods of the films, is correlated to conditions of reactive dynamics, such as temperature, pressure, and velocity.
Lubricity
Boundary lubrication
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Abstract A new lubricity additive for perfluoropolyalkylether (PFPAE) fluids was synthesized. A linear, unbranched fluid formulated with this additive was evaluated under boundary lubrication and elastohydrodynamic (EHD) lubrications. Performance of the base fluid imporved significantly with the incorporation of this additive.
Lubricity
Boundary lubrication
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Lubricity
Boundary lubrication
Carbon fibers
Dry lubricant
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The motorcycle shock absorber oil was developed by taking refined mineral oil as base oil,and adding antiwear agent,anti-oxidant,antirust additive,pour-point depressant and viscosity index improver.The service trial showed that the developed oil possesses excellent performances in both frigid zone and torrid zone, such as damping characteristic,lubricity,low temperature fluidity,shear stability,oxidation stability and antirust property.
Lubricity
Viscosity index
Pour point
Shock absorber
Mineral oil
Depressant
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Lubricity
Boundary lubrication
Ball (mathematics)
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