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The paper presents a comparison of tribological properties for two generations of sliding contacts, i.e. TG15/ Anodic Hard Coating and PASL/AlMC in oil-free piston compressors designed for ecological transport. In the first contact, the piston ring material is Teflon-graphite TG15 (PTFE+15% graphite), and in the other, an acetal-based (PA) sliding composite (PASL) with additional substances acting...
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