Abstract
In this work, wear behavior and microstructural characterization of porous layers produced in glass-ceramic substrates by pulsed laser irradiation in the nanosecond range are studied under unidirectional sliding conditions against AISI316 and corundum counterbodies. Depending on the optical configuration of the laser beam and on the working parameters, the local temperature and pressure applied over the interaction zone can generate a porous glass-ceramic layer. Material transference from the ball to the porous glass-ceramic layer was observed in the wear tests carried out against the AISI316 ball counterface whereas, in the case of the corundum ball, the wear volume loss was concentrated in the porous layer. Wear rate and friction coefficient presented higher values than expected for dense glass-ceramics.
Highlights
Laser processing has been incorporated in industry over the last decades being of great interest in the field of optics, electronics, microelectronics, aerospace and medicine
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]
The results shown from the laser porous layer, polished porous layer and dense glass-ceramic substrate seem to indicate that the generation of the porous structure is the responsible of the increment of COF and wear rate when compared with the values of the dense substrate
Summary
Laser processing has been incorporated in industry over the last decades being of great interest in the field of optics, electronics, microelectronics, aerospace and medicine. The appearance of techniques for generating short and ultrashort laser pulses, ranging from tens of nanoseconds to a few femtoseconds, have allowed the availability of more powerful systems, with power densities that can reach terawatts/cm. The appearance of techniques for generating short and ultrashort laser pulses, ranging from tens of nanoseconds to a few femtoseconds, have allowed the availability of more powerful systems, with power densities that can reach terawatts/cm2 These laser systems, with better features and lower prices, offer a high-speed/high-quality tool for laser machining, which is of great interest in both basic and applied research [3,4]. 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]. This knowledge will allow us to compare the tribological behavior in future works since stages will be to improve the wear resistance by reducing the porosity by means of controlling the atmosphere in which the process is carried out, by a laser cladding treatment on the surface or by injecting Al2O3 or ZrO2 powders into the layer during the laser processing
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