Annamaria Gisario - Academia.edu (original) (raw)
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Papers by Annamaria Gisario
Optics and Lasers in Engineering, 2010
Surface and Coatings Technology, Aug 1, 2006
Progress in Organic Coatings, Dec 1, 2006
International Journal of Refractory Metals and Hard Materials, 2015
ABSTRACT The present work deals with the post-treatment of thermally-sprayed WC–Co/NiCr coatings ... more ABSTRACT The present work deals with the post-treatment of thermally-sprayed WC–Co/NiCr coatings deposited by (High Velocity Oxygen Fuel) HVOF on a cylindrical substrate in AA 6082 T6 aluminium alloy with a High Power Diode Laser (HPDL). Laser operational parameters, especially laser power and scan rate, were investigated to find the best settings to improve the mechanical response of the WC–Co/NiCr coatings, preventing the onset of surface damage. Visual appearance and morphology of the coatings were investigated by contact gauge profilometry and scanning electron microscopy. The material microstructure was studied by combined scanning electron microscopy and energy dispersive X-ray spectroscopy. Hardness and wear resistance were analysed by instrumented indentation tests. Appropriate combinations of laser parameters were found to enhance significantly the mechanical performance of the WC–Co/NiCr coatings, whose structure was dense, compact and uniform, with hardness and wear endurance highly improved. In contrast, extreme irradiation densities of the laser beam should be carefully avoided to reduce the onset of defectiveness as wide fractures and/or additional porosities inside the thermally sprayed material.
Journal of Coatings Technology and Research, 2014
Engineering Science and Technology, an International Journal, 2014
Manufacturing Letters, 2013
International Journal of Material Forming, 2010
Tribology International, 2013
Surface and Coatings Technology, 2006
Surface and Coatings Technology, 2006
Surface and Coatings Technology, 2006
Surface and Coatings Technology, 2008
This paper deals with the development and application of a new technique, Fast Regime-Fluidized B... more This paper deals with the development and application of a new technique, Fast Regime-Fluidized Bed Machining (FR-FBM), for the easy-to-automate finishing of as-deposited Atmospheric Plasma Spraying (APS) TiO 2 coatings on AISI 1040 steel substrates. The effects of leading FBM ...
Surface and Coatings Technology, 2011
Progress in Organic Coatings, 2009
The knowledge of the properties of the coatings in terms of scratch and wear resistance is of par... more The knowledge of the properties of the coatings in terms of scratch and wear resistance is of paramount importance in order to prevent the formation of severe damages. Nonetheless, dealing with the evaluation scratch or wear resistance of an organic coating can be troublesome. They can be strongly dependent on the status of the organic material as well as on the contact condition, applied load and strain rate. Besides, reliable responses cannot be achieved if an appropriate experimental design and a combined usage of proper equipments is not scheduled. In this respect, the present analysis deals with the application of variable speed and load scratch tests to characterize the scratch response and wear resistance of bilayer metal flakes powder coatings. Experimental findings allowed the achievement of consistent trends of the deformation response vs. curing temperature, scratch load and speed as well as their empirical modelling. This way, the overall scratch resistance of the bilayer coatings could be usefully predicted on a broad range of operational conditions, thus providing helpful indications to paint manufacturers and coaters on how to best deal with the application of metal flake powders.
Progress in Organic Coatings, 2009
Electrostatic spray deposition (ESD) of aesthetic and protective low curable transparent powder c... more Electrostatic spray deposition (ESD) of aesthetic and protective low curable transparent powder coatings onto carbon fibre-reinforced epoxy composites (i.e., carbon laminates) is the matter of the present investigation. An original environment friendly pretreatment of the substrate, based on fluidized bed peening of glass beads followed by a moderate temperature oven baking, has been proposed. Then, the influence of ESD operational
Optics and Lasers in Engineering, 2010
Surface and Coatings Technology, Aug 1, 2006
Progress in Organic Coatings, Dec 1, 2006
International Journal of Refractory Metals and Hard Materials, 2015
ABSTRACT The present work deals with the post-treatment of thermally-sprayed WC–Co/NiCr coatings ... more ABSTRACT The present work deals with the post-treatment of thermally-sprayed WC–Co/NiCr coatings deposited by (High Velocity Oxygen Fuel) HVOF on a cylindrical substrate in AA 6082 T6 aluminium alloy with a High Power Diode Laser (HPDL). Laser operational parameters, especially laser power and scan rate, were investigated to find the best settings to improve the mechanical response of the WC–Co/NiCr coatings, preventing the onset of surface damage. Visual appearance and morphology of the coatings were investigated by contact gauge profilometry and scanning electron microscopy. The material microstructure was studied by combined scanning electron microscopy and energy dispersive X-ray spectroscopy. Hardness and wear resistance were analysed by instrumented indentation tests. Appropriate combinations of laser parameters were found to enhance significantly the mechanical performance of the WC–Co/NiCr coatings, whose structure was dense, compact and uniform, with hardness and wear endurance highly improved. In contrast, extreme irradiation densities of the laser beam should be carefully avoided to reduce the onset of defectiveness as wide fractures and/or additional porosities inside the thermally sprayed material.
Journal of Coatings Technology and Research, 2014
Engineering Science and Technology, an International Journal, 2014
Manufacturing Letters, 2013
International Journal of Material Forming, 2010
Tribology International, 2013
Surface and Coatings Technology, 2006
Surface and Coatings Technology, 2006
Surface and Coatings Technology, 2006
Surface and Coatings Technology, 2008
This paper deals with the development and application of a new technique, Fast Regime-Fluidized B... more This paper deals with the development and application of a new technique, Fast Regime-Fluidized Bed Machining (FR-FBM), for the easy-to-automate finishing of as-deposited Atmospheric Plasma Spraying (APS) TiO 2 coatings on AISI 1040 steel substrates. The effects of leading FBM ...
Surface and Coatings Technology, 2011
Progress in Organic Coatings, 2009
The knowledge of the properties of the coatings in terms of scratch and wear resistance is of par... more The knowledge of the properties of the coatings in terms of scratch and wear resistance is of paramount importance in order to prevent the formation of severe damages. Nonetheless, dealing with the evaluation scratch or wear resistance of an organic coating can be troublesome. They can be strongly dependent on the status of the organic material as well as on the contact condition, applied load and strain rate. Besides, reliable responses cannot be achieved if an appropriate experimental design and a combined usage of proper equipments is not scheduled. In this respect, the present analysis deals with the application of variable speed and load scratch tests to characterize the scratch response and wear resistance of bilayer metal flakes powder coatings. Experimental findings allowed the achievement of consistent trends of the deformation response vs. curing temperature, scratch load and speed as well as their empirical modelling. This way, the overall scratch resistance of the bilayer coatings could be usefully predicted on a broad range of operational conditions, thus providing helpful indications to paint manufacturers and coaters on how to best deal with the application of metal flake powders.
Progress in Organic Coatings, 2009
Electrostatic spray deposition (ESD) of aesthetic and protective low curable transparent powder c... more Electrostatic spray deposition (ESD) of aesthetic and protective low curable transparent powder coatings onto carbon fibre-reinforced epoxy composites (i.e., carbon laminates) is the matter of the present investigation. An original environment friendly pretreatment of the substrate, based on fluidized bed peening of glass beads followed by a moderate temperature oven baking, has been proposed. Then, the influence of ESD operational