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.
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|Data di pubblicazione:||2008|
|Titolo:||Fast Regime - Fluidized Bed Machining (FR-FBM) of thermally sprayed coatings|
|Autori:||M. BARLETTA; G. RUBINO; G. BOLELLI; L. LUSVARGHI|
|Appare nelle tipologie:||Articolo su rivista|
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