Effect of surface finishing on friction and wear of Poly-Ether-Ether-Ketone (PEEK) under oil lubrication

Abstract

SbstractThe tribological properties of poly-ether-ether-ketone (PEEK) containing 30% of carbon fiber were studied in an oil-lubricated environment and different surface finishing of the metallic counterbody. Four different finishing processes, commonly used in the automotive industry, were chosen for this study: turning, grinding, honing and polishing. The test system used was tri-pin on disc with pins made of PEEK and counterbody made of steel; they were fully immersed in ATF Dexron VI oil. Some test parameters were held constant, such as the apparent pressure of 2 MPa, linear velocity of 2 m/s, oil temperature at 85 °C, and the time -120 minutes. The lubrication regime for the apparent pressure of 1 MPa to 7 MPa range was also studied at different sliding speeds. A direct correlation was found between the wear rate, friction coefficient and the lubrication regime, wherein wear under hydrodynamic lubrication was, on average, approximately 5 times lower, and the friction coefficient 3 times lower than under boundary lubrication.

Friction and wear of polystyrene crystal sliding against steel 100Cr6 in unlubricated contact

“…For 2 and 5N loads, it appears that the wear mechanism change. The initial wear is certainly due to the time required to ensure that the system is in a stationary wear state [43]. The second stage corresponding to stationary wear can be qualified as abrasive wear governed by the laws discussed above.…”

Improving Tribological Performance of Porous Polyimide by Surface Polishing

“…Surface planarization, which increases the actual contact area while reducing the local contact stress of sliding interfaces, has considerable potential in the optimization of tribological performance. − Herein, we presented a polishing approach for considerably improving the lubricating properties of PPI in an oil-impregnated state. The mechanisms of surface polishing to reduce friction and suppress surface wear with blackening products forming on the PPI surface were elucidated using U-tube absorption studies and energy dispersive X-ray spectroscopy (EDS).…”