Self-lubricating elastomeric seal with polarized graphite

Details Self-lubricating elastomeric seal with polarized graphite Self-lubricating elastomeric seal with polarized graphite

E - Fixed Constructions

21

B

E21B 10/22 (2006.01) F16J 15/16 (2006.01)

Patent

CA 2462754

O-ring seals for rock bit bearings comprise a body formed from an elastomeric material having a lubricant additive in at least the dynamic seal surface to reduce the coefficient of friction and stick-slip amplitude at O-ring seal surfaces. The lubricant comprises polarized graphite. O-ring seals made from elastomeric compositions comprise in the range of from about 50 to 99 percent by volume elastomeric material, and in the range of from about 1 to 50 percent by volume of the polarized graphite based on the total volume of the composition. Preferably, the polarized graphite is in the range of from 7 to 25 percent by volume. As the O-ring seal experiences wear from adjacent metal surfaces, flakes of polarized graphite are released from the O-ring seal and adhere to the adjacent metal surfaces and from a lubricating film.

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