Tribological Behavior of Three-Dimensional Braided Carbon Fiber Reinforced Polyetheretherketone Composites

Three-dimensional (3D) braided carbon fiber reinforced polyetheretherketone (denoted as CF3D/PEEK) composites with various fiber volume fractions were prepared via hybrid woven plus vacuum heat-pressing technology and their tribological behaviors against steel counterpart with different normal loads at dry sliding were investigated. Contrast tribological tests with different lubricants (deionized water and sea water) and counterparts made from different materials (epoxy resin, PEEK) were also conducted. The results showed that the incorporation of 3D braided carbon fiber can greatly improve the tribological properties of PEEK over a certain range of carbon fiber volume fraction (V-f) and an optimum fiber loading of similar to 54% exists. The friction coefficient of the CF3D/PEEK composites decreased from 0.195 to 0.173, while the specific wear rate increased from 1.48 x 10(-7) to 1.78 x 10(-)7 mm(3) Nm(-1) with the normal load increasing from 50 to 150 N. Abrasive mechanism was dominated when the composites sliding with GCr15 steel counterpart under dry and aqueous lubrication conditions. Deionized water and sea water lubricants both significantly reduced the wear of the CF3D/PEEK composites. When sliding with neat PEEK counterpart, the CF3D/PEEK composites possess lower friction coefficient than those against epoxy resin and GCr15 steel counterparts. In general, CF3D/PEEK composites possess excellent tribological properties and comprehensive mechanical performance, which makes it become a potential candidate for special heat-resisting tribological components. (C) 2014 Society of Plastics Engineers