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TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS

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TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS ( tribology-polymeric-coatings-for-aggressive-bearing-applicat )

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limits. The mechanism of transfer film formation and their role on the sliding wear were studied using Scanning Electron Microscopy (SEM) and profilometric roughness measurements. 6.2 Experimental 6.2.1 Coating systems Figure 6.1 Photographs of coated disk samples: (a) PTFE/Pyrrolidone, (b) PEEK/PTFE. Two of the seven coatings listed in Table 4.1, namely, PTFE/Pyrrolidone (DuPontTM Teflon® 958-414) and PEEK/PTFE (1704 PEEK/PTFE®) were used in this chapter. Photographs of those coatings are depicted in Figure 6.1 and the physical properties of the coatings are given in Table 6.1. PTFE/ Pyrrolidone coating showed a glossy and dark-green colored surface, while PEEK/PTFE has a dark gray colored and matte finish. The surface roughness (Rq) of the two coatings was measured using a stylus profilometer (Tencor P-15TM) and summarized in Table 6.1. The PEEK/PTFE coating surface shows higher roughness (1.00 μm) than the PTFE/Pyrrolidone coating (0.61 μm), 105

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