Finishing of thermally sprayed metallic, ceramic, and cermet coatings is required to meet tolerances andrequirements on surface roughness in most industrial applications. Conventional machining is a costlyand time-consuming process, and is difficult to automate. Therefore, this study investigates and developsa new technique highly amenable for automation: fast regime—fluidized bed machining (FR-FBM).Atmospheric plasma sprayed TiO2, Cr2O3, and HVOF-sprayed WC-17%Co and Tribaloy-800 coatings,deposited on AISI 1040 steel substrates, were subjected to FR-FBM treatment. The effects of the leadingoperational parameters, namely, abrasive size, jet pressure, and processing time, were evaluated on allcoatings by using a two/three-levels full factorial design of experiments. The FR-FBM treated surfaceswere observed by FE-SEM and their surface finishing was evaluated by contact profilometry. Significantimprovements in surface finishing of all the machined thermally sprayed coatings can always be detected,with FR-FBM being able to guarantee the precision and to ensure the closest geometrical tolerances.
Fast Regime - Fluidized Bed Machining (FR-FBM) of thermally sprayed coatings / M., Barletta; G., Rubino; Bolelli, Giovanni; Lusvarghi, Luca. - In: JOURNAL OF THERMAL SPRAY TECHNOLOGY. - ISSN 1059-9630. - STAMPA. - 17:5-6(2008), pp. 796-804. [10.1007/s11666-008-9266-1]