Titanium aluminium nitride and titanium boride multilayer coatings designed to combat tool wear

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dc.contributor.authorRao, Jeff
dc.contributor.authorSharma, Amit
dc.contributor.authorRose, Tim
dc.date.accessioned2018-01-19T12:42:37Z
dc.date.available2018-01-19T12:42:37Z
dc.date.issued2017-12-28
dc.description.abstractThe lifetimes and the premature wear of machining tools impact on manufacturing efficiencies and productivities. A significant proportion of machining tool damage can be attributed to component wear. Here, titanium aluminium nitride (TiAlN) multi-layered with titanium diboride (TiB2) prepared by PVD (Physical Vapour Deposition) sputtering onto H-13 substrates are studied as potential wear-resistant coatings for forging die applications. The TiB2 content has been altered and two-sets of coating systems with a bilayer thickness either less than or greater than 1 μm are investigated by tribological and microstructural analysis. XRD analysis of the multilayers reveals the coatings to be predominately dominated by the TiAlN (200) peak, with additional peaks of TiN (200) and Ti (101) at a TiB2 content of 9%. Progressive loads increasing to 100 N enabled the friction coefficients and the coating failure at a critical load to be determined. Friction coefficients of around 0.2 have been measured in a coating containing 9% TiB2 at critical loads of approximately 70 N. Bi-directional wear tests reveal that bilayers with thicknesses greater than 1 μm have frictional coefficients that are approximately 50% lower than those where the bilayer is less than 1 μm. This is due to the greater ability of thicker bilayers to uniformly distribute the stress within the layers. There are two observed frictional coefficient regimes corresponding to a lower and higher rate of material loss. At the lower regime, with TiB2 contents below 20%, material loss occurs mainly via delamination between the layers, whilst at compositions above this, material loss occurs via a break-up of material into finer particles that in combination with the higher loads results in greater material loss. The measured wear scar volumes for the TiAlN/TiB2 multilayer coatings are approximately three times lower than those measured on the substrate, thus validating the increased wear resistance offered by these composite coatings.en_UK
dc.identifier.citationRao J, Sharma A, Rose T, Titanium aluminium nitride and titanium boride multilayer coatings designed to combat tool wear, Coatings, Vol. 8, Issue 1, 2018en_UK
dc.identifier.cris19228169
dc.identifier.issn2079-6412
dc.identifier.urihttp://dx.doi.org/10.3390/coatings8010012
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/12911
dc.language.isoenen_UK
dc.publisherMDPIen_UK
dc.rightsAttribution 4.0 International*
dc.rightsAttribution 4.0 International (CC BY 4.0) You are free to: Share — copy and redistribute the material in any medium or format Adapt — remix, transform, and build upon the material for any purpose, even commercially. The licensor cannot revoke these freedoms as long as you follow the license terms. Under the following terms: Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. Information: No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectHard coatingsen_UK
dc.subjectNitridesen_UK
dc.subjectBoridesen_UK
dc.subjectTool wearen_UK
dc.subjectWearen_UK
dc.subjectMultilayersen_UK
dc.titleTitanium aluminium nitride and titanium boride multilayer coatings designed to combat tool wearen_UK
dc.typeArticleen_UK

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