Laser nitriding of pure titanium with Ni, Cr for improved wear performance

Fu, Yong Qing and Batchelor, Andrew (1998) Laser nitriding of pure titanium with Ni, Cr for improved wear performance. Wear, 214 (1). pp. 83-90. ISSN 0043-1648

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Abstract

Titanium and its alloy suffer from galling, seizing, ploughing and adhesion during sliding contacts. A laser nitriding method to improve the tribological properties of pure titanium was investigated in this study. Before laser nitriding, a layer of nickel and chromium was plasma sprayed onto the surface of pure titanium in order to prevent the formation of cracks and pores during laser treatment. A scanning electron microscope (SEM) and image analyser were used to optimize the laser processing parameters and analyse the coating microstructure. X-ray diffraction (XRD), a Talysurf 5 tester and microhardness tester were used to analyse the phase crystallinity, surface roughness and micro-hardness of the laser treated coating. A ball-on-flat reciprocating wear machine was used to evaluate the sliding and fretting wear behaviours of both untreated and laser treated specimens. Results showed a substantial improvement in wear resistance after laser treatment which can be attributed to a significant improvement in hardness and corrosion resistance as well as a decrease in friction properties of nitrided layers.

Item Type: Article
Uncontrolled Keywords: Laser alloying; Laser nitriding; Pure titanium; Sliding wear; Fretting wear
Subjects: F200 Materials Science
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Becky Skoyles
Date Deposited: 27 Mar 2015 11:25
Last Modified: 24 Oct 2017 08:55
URI: http://nrl.northumbria.ac.uk/id/eprint/21898

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