Multilayer CVD Diamond Coatings in the Machining of an Al6061-15 Vol % Al2O3 Composite
authors Shabani, M; Sacramento, J; Oliveira, FJ; Silva, RF
nationality International
journal COATINGS
author keywords CVD diamond; multilayer coating; turning; MMC; tool wear
keywords METAL-MATRIX COMPOSITES; CARBIDE REINFORCED ALUMINUM; COATED CUTTING TOOLS; FATIGUE-STRENGTH; PERFORMANCE; MACHINABILITY; WEAR; HARDMETAL; ADHESION; INSERTS
abstract Ceramic cutting inserts coated with ten-fold alternating micro- and nanocrystalline diamond (MCD/NCD) layers grown by hot filament chemical vapor deposition (CVD) were tested in the machining of an Al based metallic matrix composite (MMC) containing 15 vol % Al2O3 particles. Inserts with total coating thicknesses of approximately 12 mu m and 24 mu m were produced and used in turning: cutting speed (v) of 250 to 1000 m.min-1; depth of cut (DOC) from 0.5 to 3 mm and feed (f) between 0.1 and 0.4 mm.rev-1. The main cutting force increases linearly with DOC (ca. 294 N per mm) and with feed (ca. 640 N per mm.rev-1). The thicker coatings work within the following limits: DOC up to 1.5 mm and maximum speeds of 750 m.min-1 for feeds up to 0.4 mm.rev-1. Flank wear is predominant but crater wear is also observed due to the negative tool normal rake. Layer-by-layer wear of the tool rake, and not total delamination from the substrate, evidenced one of the advantages of using a multilayer design. The MCD/NCD multilayer diamond coated indexable inserts have longer tool life than most CVD diamond systems and behave as well as most polycrystalline diamond (PCD) tools.
publisher MDPI AG
issn 2079-6412
year published 2017
volume 7
issue 10
digital object identifier (doi) 10.3390/coatings7100165
web of science category Materials Science, Coatings & Films
subject category Materials Science
unique article identifier WOS:000414849800014
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journal impact factor 2.350
5 year journal impact factor 2.969
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