Riassunto analitico
This thesis project concerns the study of multifunctional coatings deposited on samples produced via additive manufacturing (AM). This thesis work is part of the activities of the RIMMEL project - POR-FESR 2018 Emilia Romagna - representing the initial and preparatory step. The Thesis, in fact, is developed as an extensive bibliographic research on the state of the art of the AM processes and the deposition of Diamond-Like Carbon (DLC), and represents the first experimental approach related to the preparation activities of AM surfaces and the related depositions of DLC on them.
In particular, the substrates of an AlSi10Mg alloy were produced via Selective Laser Melting (SLM) technique; these substrates were subsequently subjected to various surface finishing treatments. The obtained surfaces were characterized both from the morphological and the crystalline structure point of view. Some test depositions of chemical Ni were carried out on the samples thus obtained; this intermediate layer will act as a buffer layer between the substrate and the DLC coating. These preliminary tests show how the adhesion of the Ni layer strongly depends on the growth modalities of the substrates, in particular the cooling effect.
Finally, in order to optimize the DLC deposition recipes, two DLC coatings were made via Magnetron Sputtering Physical Vapor Deposition (PVD) by varying some growth parameters, studying the effect on the structural characteristics of the thin film. The produced coatings replicate the surface morphology of the substrate and organize themselves into an amorphous form.
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