||Formation of Periodical Structure Formed on Diamond-like Carbon Film with a Femtosecond Laser : The formation on sliding surface of machine part
82 , 2016-03
Recently, it was reported that nano scale structure are formed on the metal surfaces by irradiating femtosecond laser pulses at an energy power density (fluence) slightly above the ablation threshold . These structures have lately attracted considerable attention as a method to give a high function to the surface. This was verified experimentally by the authors in a recent paper [21. In this paper, we report the formation of the structure to the cylindrical surface of thepiston ring as a proper example of sliding surface of machine parts (piston ring). As a result, the processing system combined the femtosecond laser and NC rotation stage was developed and formed the nano scale structure (pitch A = 311 nm) on the piston ring at F = 0.13 J/cm2, v = 24 mm/s, is = 60 gm.