Niobium coated Ti-Al alloy: improvement of tribological behaviour, oxidation resistance and flame retardancy

Abstract

Double glow plasma (DGP) coatings were recommend for metallic components to mitigate the damage induced by complex working conditions. In this paper, A Ti-Al alloy was coated with niobium (Nb) via a DGP process to enhance its anti-oxidation properties, wear resistance and flame retardancy. The results showed that the Nb-coated Ti-Al alloy mainly comprised Nb, AlNb2, AlMoTi2 and β-Ti phases. Room temperature sliding-friction tests indicated that the Nb-coated Ti-Al alloy exhibited a stable friction coefficient of an average value of 0.25, whilst the same value for via the uncoated Ti-Al alloy was around 0.45. High-temperature oxidation tests revealed compact oxide grains without cracks after the 100 h test, indicating good oxidation resistance. An ablation test showed that the Nb-coated Ti-Al alloy exhibited excellent flame retardancy, with the ablation time of the Nb-coated Ti-Al alloy at 1.62 times that of the uncoated Ti-Al base alloy. The alloy’s tribological behaviour, oxidation resistance and flame retardancy mechanisms are discussed in detail in this paper.

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Item Type:	Article
Authors/Creators:	Wei, X Zhang, P Wei, D Zhao, H Liskiewicz, TW https://orcid.org/0000-0002-0866-814X
Copyright, Publisher and Additional Information:	This is an author produced version of a paper published in International Journal of Surface Science and Engineering. Uploaded in accordance with the publisher's self-archiving policy.
Keywords:	Double glow plasma technique; Nb-coated Ti-Al; wear resistance; high temperature oxidation resistance; flame retardancy.
Dates:	Published: 19 December 2016 Published (online): 19 December 2016 Accepted: 24 December 2015
Institution:	The University of Leeds
Academic Units:	The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Mechanical Engineering (Leeds) > Institute of Functional Surfaces (Leeds)
Depositing User:	Symplectic Publications
Date Deposited:	20 Jan 2016 14:40
Last Modified:	04 Nov 2017 00:22
Published Version:	https://doi.org/10.1504/IJSURFSE.2016.081031
Status:	Published
Publisher:	Inderscience
Identification Number:	10.1504/IJSURFSE.2016.081031
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:93828

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Niobium coated Ti-Al alloy: improvement of tribological behaviour, oxidation resistance and flame retardancy

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