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iron substrate effects, and correlation with the polymer structure. Using a combination of large force range (~ 300 mN) and large displacement range (~ 7 μm) indentation, the complete coating response could be measured together with the effect of the hard substrate. The microstructural differences between the coatings were examined using scanning electron microscopy (SEM) and were used to explain differences in their micromechanical properties. The measured micromechanical properties, which could be readily obtained by performing simple laboratory indentation tests, were successfully correlated with compressor specific tribological experiments. 4.2 Experimental 4.2.1 Coatings Figure 4.1 shows a representative coating and substrate sample used in this work ® (DuPontTM Teflon® 958-414), Resin/PTFE/MoS2 (Whitford Xylan® 1052), PEEK/PTFE ®® (1704 PEEK/PTFE ), PEEK/Ceramic (1707 PEEK/Ceramic ), Fluorocarbon ®® (Impreglon 218), and PTFE/MoS2 (Fluorolon 325) were used in this chapter. TM Especially, pyrrolidone-based PTFE coatings (from DuPont abrasion resistance, thus exhibiting exceptional durability (Chapter 3). Coatings blended with MoS2 can normally sustain high normal loads and may offer, at the same time, low shear strength due to lamellar structure of MoS2, thus resulting in a lubricious low which was already tribologically tested in Chapter 3 as well. Gray cast iron (Dura-Bar G2) was chosen as a substrate material and machined to 79 mm diameter and 8 mm thickness disks, as can be seen in Figure 4.1(a). Seven different polymeric coatings, namely, PTFE/Pyrrolidone-1 (DuPontTM Teflon® 958-303), PTFE/Pyrrolidone-2 50 ) have great toughness andPDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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