Abstract
The tribological behaviour of polyetheretherketone (PEEK) filled with nanometer ZrO 2 was studied. The composite blocks with different filler proportion and particle size were prepared by compression moulding. The friction and wear properties of nanometer ZrO 2-filled PEEK were investigated under ambient conditions on a block-on-ring machine by running the PEEK composite block against a plain carbon steel (AISI 1045 steel) ring. The influence of nanometer ZrO 2 with the different particle size on the morphologies of the wear traces and the transfer film was observed by scanning electron microscopy (SEM). It was found that nanometer ZrO 2-filled PEEK composite exhibits a lower frictional coefficient than pure PEEK. The ability of nanometer ZrO 2 to improve the tribological behaviour is increased with decreasing the particle size of nanometer ZrO 1. The wear rate of larger particle size ZrO 2-filled PEEK was high because the composite transfer film had poor adhesion to the counterface. On the other hand, the wear-resistant PEEK composite which was filled with small size ZrO 2 particles transferred well to the counterface and its transer film was thin, uniform and adhered strongly to the counterface. Thus the improvement in the tribological behaviours of nanometer ZrO 2-filled PEEK composite is related to the improved characteristics of the transfer film.
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