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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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typical hard coatings such as diamond-like-carbon (DLC) and WC/C with a thickness of 2.5 μm (Solzak and Polycarpou, 2010). The RMS roughness of each coating was measured using a stylus profilometer (Tencor P-15TM) and found to be in the range of 0.61~2.28 μm. 5.2.2 (a) Tribological testing Gray Cast Iron (b) Disk (coated) Normal load 52100 Steel Shoe Figure 5.1 (a) Photograph of a cut-away automotive swash-plate compressor, (b) schematic of a crowned self-aligned pin (known as shoe)-on-disk test configuration for unidirectional testing simulating a swash plate compressor. Unidirectional sliding tests were performed on PTFE- and PEEK-based polymeric coatings at controlled elevated environment temperatures up to 110°C (machine chamber setting in closed loop). Note that the interface temperature is likely higher than the chamber temperature setting. Figure 5.1(a) shows a photograph of a typical swash-plate compressor showing the rotating swash-plate making contact with several crowned pins that drive the pistons. Figure 5.1(b) shows the contact configuration for unidirectional testing, showing a crown shaped pin (which is an actual component used in swash plate compressors and referred to as shoe in this work) in contact with a rotating disk coated 80

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TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS

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