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Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/1409

Title: Energy Efficiency Improvements in Dry Drilling with Optimised Diamond-Like Carbon Coating
Authors: Zolgharni, M
Jones, BJ
Bulpett, R
Anson, AW
Franks, J
Keywords: Cutting tools
Plasma CVD
Diamond-like carbon
Surface Characterization
Publication Date: 2007
Publisher: Elsevier BV
Citation: Diamond & Related Materials 17: 1733, Dec 2007
Abstract: We demonstrate enhancements of performance and energy efficiency of cutting tools by deposition of diamond-like carbon (DLC) coatings on machine parts. DLC was deposited on steel drill bits, using plasma enhanced chemical vapour deposition (PECVD) with the acetylene precursor diluted with argon, to produce a surface with low friction and low wear rate. Drill bit performance in dry drilling of aluminium was quantified by analysis of power consumption and swarf flow. Optimised deposition conditions produced drill bits with greatly enhanced performance over uncoated drill bits, showing a 25% reduction in swarf clogging, a 36% reduction in power consumption and a greater than five-fold increase in lifetime. Surface analysis with scanning electron microscopy shows that DLC coated drills exhibit much lower aluminium build up on the trailing shank of the drill, enhancing the anti-adhering properties of the drill and reducing heat generation during operation, resulting in the observed improvements in efficiency. Variation of drilling efficiency with argon dilution of precursor is related to changes in the microstructure of the DLC coating.
URI: http://bura.brunel.ac.uk/handle/2438/1409
ISSN: 0925-9635
Appears in Collections:School of Engineering and Design Research papers
Materials Engineering
The Experimental Techniques Centre

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