Frictional behaviour of some sealing elastomers in lubricated sliding

• Frictional behaviour of four sealing elastomers, including an acrylonitrile butadienerubber (NBR), a hydrogenated acrylonitrile butadiene rubber (HNBR), an acrylate rubber(ACM) and a fluoroelastomer (FKM), sliding against a steel surface under unidirectionallubricated conditions have been studied. The lubricant used in this study was paraffinic oilwith no additive and the experiments were conducted under a block-on-ring testconfiguration. The friction coefficients of the elastomers have been measured at differentsliding velocities in boundary and fluid film lubrication regimes. In the first part of each test,the sliding velocity varied from low to high values and then, in the second part, the slidingvelocity varied from high to low values repeating the same conditions in reverse order. Theresults show that the friction coefficients at low speeds are different for the two parts whichcan be due to the oil absorption or possibly dissolution of some elastomer constituents in theoil. The NBR and the ACM were the least and the most affected elastomer by the lubricantrespectively. The friction coefficients of NBR and ACM at low speeds decreased in thesecond part of the tests (in which the interaction of oil and elastomer was for longerdurations) but the friction coefficient of HNBR and FKM increased in the second part of thetests.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Tribologi (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Tribology (hsv//eng)

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Maskinelement

Machine Elements

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