Effect of counterface surface roughness and its evolution on the wear and.pdf

WEAR E L S E V I E R Wear 217 (1998) 288-296 Effect of counterface surface roughness and its evolution on the wear and friction of PEEK and PEEK-bonded carbon fibre composites on stainless steel D . M . E i l i o t t ~, J. F i s h e r ~*, D . T . C l a r k b l)epartment ~fMechanical Engineering. Universityof Leeds, la,ed.v, LS2 9JT, UK hRe.~earch Unitfor Surfaces. Transfi~rmsand Inlerfaces. Daresbury Laboraulry, Warringtml. WA44AD. UK Received 22 September 1997;accepted 9 January 1998 Abstract The time-dependent variations in the dry sliding wear rate and friction of PEEK (450G and 100P) and carbon fibre-bonded PEEK (APC2) on stainless steel ( 316S 16) have been investigated and the evolution of wear scratches measured with optical profilometry. A three-pin-on- disk tester was u~d, operating at 0.18 m s ~, with a pressure of I.O MPa on 5 mm diameter pin. Specific wear rates were calculated from ma.,~slost by the pins at 15 km intervals and friction force was monitored by a strain-gauged torque beam. Two series of 9d-kin tests were performed for each pin/disk combination. The stainless steel disks had either a fine-ground or polished surface. The roughness of the ground stainless steel surface was cbo.~n to coincide with the optimum value for low wear rate of the PEEK pins. To maximise pin/disk contact area, the PEEK and APC2 pin surfaces were mn-in on 10do-grit silicon carbide paper and ultrasonically cleaned in acetone before the tint wear test. There was no significant difference in steady-state wear between these pins and those tested with as-moulded surface