Micro- and nano-crystalline CVD diamond coated tools in the turning of EDM graphite
authors Almeida, FA; Sacramento, J; Oliveira, FJ; Silva, RF
nationality International
journal SURFACE & COATINGS TECHNOLOGY
author keywords Cutting tools; Diamond film; Hot filament CVD; EDM graphite
keywords CUTTING TOOLS
abstract Electrical discharge machining is a widely used technique, namely in metal mould shaping. High quality EDM graphite is the foremost choice as electrode material but the random oriented graphite aggregates cause an abrasive action over the tools used in its machining. Wear-resistant diamond tools were then chosen as an adequate option to guarantee tight tolerances and good surface finishing. In this work, microcrystalline and nanocrystalline CVD diamond coated inserts are used in turning operations. Cutting forces were always very low (<20 N) as also was the tool wear. An important result is the absence of diamond film delamination showing the high adhesion level offered by the silicon nitride ceramic substrates for CVD diamond coating. The smoother narrocrystalline coatings allowed to obtain a better workpiece surface roughness than the microcrystalline ones. (C) 2008 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE SA
issn 0257-8972
year published 2008
volume 203
issue 3-4
beginning page 271
ending page 276
digital object identifier (doi) 10.1016/j.surfcoat.2008.08.075
web of science category Materials Science, Coatings & Films; Physics, Applied
subject category Materials Science; Physics
unique article identifier WOS:000261360600013
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journal analysis (jcr 2019):
journal impact factor 3.784
5 year journal impact factor 3.754
category normalized journal impact factor percentile 83.171
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