Improvement in the Tribological Characteristics of Si-DLC Coating by Laser Surface Texturing at Elevated Temperatures

摘要

This paper presents and discusses the tribological behavior of the untextured and textured silicondiamond-like carbon (Si-DLC) coatings in the temperature range of room temperature to 200 0C. Dimpleswere produced using a laser surface texturing (LST) technique on a Si-DLC coating deposited onto abearing steel substrate using a chemical vapor deposition (CVD) system to achieve good tribologicalbehavior. The friction and wear behavior of the untextured and textured Si-DLC coatings was investigatedby conducting friction tests against an alumina (Al_2O_3) ball. The friction test results showed that thetextured Si-DLC coating led to a lower friction coefficient and wear compared to that of the untextured Si-DLC coating throughout the temperature range tested, which may be attributed to the storage of weardebris and microstructural alteration due to the high-energy action of the pulsating laser beam.