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Please use this identifier to cite or link to this item: http://dspace.lib.cranfield.ac.uk/handle/1826/990

Document Type: Article
Title: Carbon and titanium diboride (TiB2) multilayer coatings.
Authors: Rao, Jeff
Cruz, R.
Lawson, K. J.
Nicholls, J. R.
Issue Date: 2004
Citation: J. Rao, R. Cruz, K.J. Lawson and J.R. Nicholls, Carbon and titanium diboride multilayer coatings, Diamond and Related Materials, Volume 13, Issues 11-12, November-December 2004, Pages 2221-2225.
Abstract: Titanium Diboride, (TiB2) is a metal-based refractory ceramic material that has been investigated in industrial applications ranging from, cutting tools to wear parts and for use in the aerospace industry. The unique properties which make this material so fascinating are, its high hardness, high melting point and its corrosion resistance. TiB2 is prevented from wider mainstream use because of its inherent brittle nature. With a view to overcome this in coating form and with the aim of providing in addition inherent lubricity, in this study 50 layer TiB2/C multilayer stacks have been fabricated, with varying volume fractions of ceramic, whereby the interfaces of the layers limit crack propagation in the TiB2 ceramic. TiB2 has been multilayered with carbon, to make use of the unique and hybrid nature of the bonding in carbon coatings. DC magnetron sputtering with substrate bias was the preferred route for the fabrication of these coatings. AISI tool steel has been used as the substrate material. By varying the amount of TiB2 ceramic from 50% to 95%, the Hardness of the coating is seen to increase from 5 GPa to 17GPa. The Hardness is observed to decrease as a function of increasing carbon content, agreeing with other studies that the carbon layers are not load-bearing. The graphitic nature of the sp2 bond, however, acts as a lubricant layer.
URI: http://dspace.lib.cranfield.ac.uk/handle/1826/990
Appears in Collections:Staff publications - School of Applied Sciences

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