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262 Friction 3(4): 259–265 (2015) Fig. 4 Topography of AISI 304 stainless steel disc before (a) and after (b) wear test at 30 °C and atmospheric air. Red arrow indicates sliding direction. Fig. 5 Wear tracks root mean square roughness (Rq) extracted from profiles transverse to the sliding direction. Average Rq from virgin regions is also displayed. Fig.6 Topography profile (transverse to sliding direction) extracted from wear track boundary of counter body tested under atmospheric air at 80 °C. Green and red areas show wear track peaks and valleys, respectively, in relation to the mean height from the virgin region. under nominal contact pressures below the yield stress of the metallic material, the polymeric portion is still able to plow metallic polished surfaces. Figure 7 presents typical results from image analyses of worn samples. Micrographs of PEEK wear regions revealed grooves aligned in the direction of sliding, typical of microploughing wear mechanisms, and shear-induced plastic flow regions on the boundary of the worn surfaces, attributed to smearing [11, 14, 16]. Additionally, as the cylinders wear out, one could observe carbon fibers protruding from the active surface. Contact between these spots and the metallic surface produces elevated pressures and temperatures, which could plow the counter body surface and result Fig. 7 in the grooves shown in Fig. 4 [17−19]. Subsequently, abraded metallic surfaces filled with sharp asperities were able to plow the polymer surface and wear out the carbon fiber edges. However, although the topographical analyses did not show evidence of significant material deposition on the wear tracks, micrographs from the counter body surface revealed the formation of a tribo-layer. According to Ref. [17], the grooves plowed into polished counter bodies enhance the establishment of a tribo-layer. Note that free carbon fibers were not observed on the counter body surface. Optical micrographs of polymer (a) and counter body (b) worn regions from samples tested under atmospheric air at 80 °C. Red arrows indicate sliding direction. Blue arrows indicate regions of shear-induced plastic flow (a) and material deposition (b).PDF Image | Effect of temperature and atmosphere on the tribological behavior of a polyether ether ketone composite
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