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0.3 (a) 0.2 0.129 0.3 POE lubricant-only, Regular Pin (b) 0.2 0.142 POE lubricant-only, Smaller pin 0.041 0.040 0.039 0.037 0.037 0.037 0.1 0.0 0.051 0.045 0.045 0.045 0.041 0.043 0.041 0.040 0.1 0.054 0.044 0.075 0.079 0.0 0 4 8 12 16 20 0 4 8 12 16 20 Time (min) Time (min) Figure 6.7 In-situ friction coefficient of synthetic lubricant-only fretting conditions with (a) 6.3 mm pin and (b) 3.2 mm pin. Optical images of worn disks after experiment using the (c) 6.3 mm pin and (d) the 3.2 mm pin. 6.3.1.3 Polymeric coatings plus liquid lubricated experiments A second question is the effect of the addition of liquid lubricant at the polymeric coating interface. Such study is practically important since it is unlikely that liquid lubricants will be completely replaced by polymeric coatings (resulting in oil-less compressors) at the outset. More likely there will be a transitional period where the polymeric coatings are introduced into existing compressors that already use liquid lubricants. To answer this question, another set of fretting experiments using the best performing PTFE/Pyrrolidone coating (against the 6.3 mm pin) was performed in the presence of 23 mg RL32-3MAF lubricant. The in-situ friction coefficient is shown in Figure 6.8(a) shows that after 12 min, the COF reached the value of 0.030, which is between the COF for the coating-only case, Figure 6.3(b), and liquid lubricant-only case, 115 COF COFPDF Image | TRIBOLOGY OF POLYMERIC COATINGS FOR AGGRESSIVE BEARING APPLICATIONS
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