TiAIN superlattice structured PVD coatings: a new alternative in the machining of aluminium alloys for aerospace and automotive components

HOVSEPIAN, Papken, LUO, Q., PITTMAN, M. and ROBINSON, Gary (2005). TiAIN superlattice structured PVD coatings: a new alternative in the machining of aluminium alloys for aerospace and automotive components. Surface and coatings technology, 1-2.

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Link to published version:: 10.1016/j.surfcoat.2005.11.106

Abstract

A 3 μm thick superlattice structured TiAlN/VN coating has been deposited by the steered cathodic arc/unbalanced magnetron sputtering technique. The coating has been tested in dry high-speed milling of aluminium alloys Al7010-T7651 and AlSi9Cu1 and the performance compared to that of the diamond-like carbon (DLC) coated, TiAlCrYN coated and uncoated tools. In milling the Al7010-T7651 alloy, TiAlN/VN and DLC coated tools showed comparable performance, outperforming TiAlCrYN coated and uncoated tools by a factor of 2.3 and 3.5, respectively. In the case of milling AlSi9Cu1, the DLC coatings failed to produce any lifetime improvement, TiAlCrYN showed 65% longer lifetime thus rendering TiAlN/VN as the best performing coating with 100% longer lifetime compared to that of the uncoated tools. The tests further showed that TiAlN/VN reduces the cutting forces and improves the surface finish. Scanning electron microscopy of the cutting edge carried out after the cutting tests showed that the TiAlN/VN coating significantly reduces metal transfer and built-up edge formation.

Item Type: Article
Additional Information: Copyright © Elsevier B.V.
Research Institute, Centre or Group: Materials and Engineering Research Institute > Thin Films Research Centre > Nanotechnology Centre for PVD Research
Materials and Engineering Research Institute > Materials Analysis and Research Services
Identification Number: 10.1016/j.surfcoat.2005.11.106
Depositing User: Ann Betterton
Date Deposited: 29 Jul 2008
Last Modified: 05 Oct 2010 15:34
URI: http://shura.shu.ac.uk/id/eprint/586

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