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Title: Tribological properties of duplex plasma oxidised, nitrided and PVD coated Ti-6Al-4V
Authors: Cassar, Glenn
Banfield, Sarah
Avelar-Batista Wilson, J. C.
Housden, Jonathan
Matthews, Allan
Leyland, Adrian
Keywords: Triodes
Plasma diffusion
Physical vapor deposition
Issue Date: 2011
Publisher: Elsevier B.V.
Citation: Cassar, G., Banfield, S., Wilson, J. A. B., Housden, J., Matthews, A., & Leyland, A. (2011). Tribological properties of duplex plasma oxidised, nitrided and PVD coated Ti-6Al-4V. Surface and Coatings Technology, 206(2), 395-404.
Abstract: Sequential triode plasma oxidation and nitriding have been used to provide enhanced load support for physical vapour deposited (PVD) hard coatings. The diffusion process has been designed to maximise process efficiency and coating adhesion, thereby significantly improving the tribological properties of the Ti–6Al–4V alloy — particularly at high contact pressures. This has been demonstrated using unlubricated linear reciprocating-sliding ball-on-plate wear tests and micro-scratch adhesion testing. Also, surface micro- profilometry, nano/micro-indentation hardness testing, scanning electron microscopy (SEM), energy- dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and glow-discharge optical emission spectroscopy (GDOES) data are presented to corroborate the effect of the several plasma diffusion processes and duplex diffusion/coating combinations discussed here. The results presented show that the novel processing technique developed permits the use of oxygen diffusion in order to obtain relatively large case depths in shorter treatment times without compromising the adhesion strength of subsequently deposited PVD layers.
Description: The authors gratefully acknowledge financial support from the UK Technology Strategy Board under Technology Programme project TP/22076, for underpinning research carried out at Sheffield University, on which the work presented in this paper was partially based.
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