Formation of nanocrystalline foamy coatings by laser irradiation of glass-ceramic substrates in the nanosecond regime

Microstructural and Wear Behavior Characterization of Porous Layers Produced by Pulsed Laser Irradiation in Glass-Ceramics Substrates

“…The possibility of producing porous layers on the surface of glass-ceramic substrates has been demonstrated when the substrate is machined by means of pulsed lasers in the nanosecond range [22,23]. Laser ablation in the nanosecond range is a photothermal-mechanical process so that the material is removed by the thermal mechanisms activated by the laser beam.…”

“…In this case, the formation mechanisms are in relation with the variation of the absorbance of the glass-ceramic substrate with the wavelength. The absorbance of the glass-ceramics substrate decreases with the wavelength [23]. In particular, the optical absorption coefficients, α, for 355 and 532 nm are 62.13 and 28.37 cm −1 , 17 and 8 times greater than for 1064 nm, the value of which is 3.52 cm −1 .…”

“…Their chemical composition and structure were fully characterized by the authors in a previous paper [23]. Its main properties are shown in Table 1.…”

“…In previous works, the formation mechanisms for generating porous layers by pulsed laser irradiation on the surface of a glass-ceramic substrate in function of the laser wavelength and substrate temperature in the nanosecond range were studied [22,23]. In this work we present the wear behavior characterization of this porous layer in order to determine the friction coefficient (COF) and the wear resistance.…”

“…Furthermore, laser machining and surface modification of these materials are very interesting for functional purposes in industrial applications since these modifications may be applied as thermal-barriers, heat-conductor tracks, inclusion of thermal sensors, etc. [20,21,22,23]. …”