Abstract
In order to improve the superficial wear resistance and hardness of aluminium substrates, aluminium nitride AlN coatings were elaborated by laser-induced plasma surface processing. Due to plasma formation on the Al surface, the effect of excimer laser irradiation under nitrogen atmosphere allows nitrogen diffusion and then AlN growth in the Al matrix. In this way, it is possible to avoid the adhesion problems encountered in film deposition processes. To understand the mechanisms governing this surface transformation, chemical and microstructural investigations were correlated with processing conditions. The influence of laser spots in overlapping mode from a step-by-step to quasi-continuous scan in the two in-plane directions, X and Y, were studied by grazing incidence X-ray diffraction and scanning electron microscopy, coupled with energy dispersive X-ray spectrometry analysis. These investigations were consequently correlated with wear resistance estimated by a pin-on-disc machine. The results show a strong enhancement of wear resistance when the overlapping rate is maximum in both the X and Y directions.
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