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higher contact pressure testing. The roughness of the pin surfaces was 0.3 μm – 0.4 μm (smoother than the polymeric coating surfaces). Figure 6.2 Photographs of the cylindrical pins. The 6.3 mm diameter contact surface is considered as “standard” size and the reduced diameter (3.2 mm) pin enables higher contact pressures. Fretting motion with 3 mm translation amplitude and 4.4 Hz reciprocating frequency was imposed on the pin-on-disk interface, thus resulting in an average linear sliding speed of 26.4 mm/s. The applied normal load started from 133 N (30 lb), and progressively increased by 133 N every 2 min, up to 1334 N (300 lb) (20 min testing) to examine the scuffing resistance of the coatings. Assuming a nominally flat pin surface under the initial 133 N normal load, the corresponding contact pressures are 4.28 MPa and 16.58 MPa for the regular pin and the reduced diameter pin, respectively. Testing was performed under conditions simulating a compressor environment, namely, inside an environmentally controlled chamber filled with 40 psi of R-134A refrigerant at room temperature. Table 6.2 summarizes the experimental conditions used in this work. 107PDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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