The Influence of Diesel Soot on Tribological Behavior of Cylinder Liner/Piston Ring

An SRV IV oscillating reciprocating friction and wear tester was used to investigate the influence of diesel soot on the friction and wear behavior of piston ring-cylinder liner. The tribological mechanisms of the diesel soot were analyzed with the assistance of scanning electron microscopy/energy-dispersive spectrometry, 3D profiler, Raman spectrometry. Results indicate that diesel soot reduced friction coefficient of piston ring-cylinder liner at high load. Diesel soot could give rise to abrasion in cylinder liner due to abrasive wear. The friction-reducing mechanisms of diesel soot could be ascribed to the outer peeling of the disordered graphite structures, which formed new lubricating films on the friction pair under the friction heat and shear forces.