Wei, X, Zhang, P, Wei, D et al. (3 more authors) (2017) Mechanical and tribological properties of Cr-Nb double-glow plasma coatings deposited on TiAl alloy. Tribology - Materials, Surfaces & Interfaces, 11 (2). pp. 98-106. ISSN 1751-5831
Abstract
Double-glow plasma (DGP) coatings are recommended for metallic components to mitigate the damage induced by complex working conditions in previous studies. In this paper, Nb-rich (Cr–Nb₄) and Cr-rich (Cr₄–Nb) -alloyed layers were formed onto the Ti–Al substrate via a DGP process to enhance its wear resistance. Scratch and Nano-indentation tests were used to evaluate the mechanical properties of the coatings. The tribological behaviour of the coatings were investigated using a pin-on-disc tribometer by rubbing against the GCr15 ball. Results from surface analysis techniques showed that the coatings mainly comprised Cr, Nb and Cr₂–Nb phases, and were well bonded to the substrate. The hardness of the Cr–Nb₄ coating was 11.61GPa and the Cr₄–Nb coating was 9.66 GPa which all higher than that of the uncoated Ti–Al which was 5.65 GPa. However, the critical load of the Cr₄–Nb coating ~21.64 was higher than that of the Cr–Nb₄ coating ~17.6. And the specific wear rate of Cr–Nb₄ coating, Cr₄–Nb coating and uncoated Ti–Al were 3.54 × 10−⁴, 0.01 × 10−⁴ and 1.53 × 10−⁴mm³ N−¹ m−¹, respectively. The low-wear mechanism of the coatings is discussed in detail in this paper.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2017 Institute of Materials, Minerals and Mining and Informa UK limited, trading as Taylor & Francis Group. This is an Accepted Manuscript of an article published by Taylor & Francis in Tribology - Materials, Surfaces & Interfaces on 6th July 2017, available online: http://www.tandfonline.com/10.1080/17515831.2017.1339484. |
Keywords: | Ti–Al, double-glow plasma, nano-indentation, friction, chromium–niobium |
Dates: |
|
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: | 23 May 2017 10:22 |
Last Modified: | 06 Jul 2018 00:38 |
Status: | Published |
Publisher: | Taylor and Francis |
Identification Number: | 10.1080/17515831.2017.1339484 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:116741 |