Revealing the hidden world of fretting wear processes of surface coatings by X-ray imaging

Fu, Yong Qing, Batchelor, Andrew and Loh, Nee Lam (1998) Revealing the hidden world of fretting wear processes of surface coatings by X-ray imaging. Surface and Coatings Technology, 107 (2-3). pp. 133-141. ISSN 0257-8972

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Abstract

Detailed wear and friction phenomena are usually hidden between the two contacted surfaces. Direct or in-situ observation of wear process is supposed to obtain some time-dependent changes and shed more light on the real wear and friction mechanisms. In this paper, X-ray imaging, one of the advanced tools for modern non-contact and non-destructive inspection, was applied to observe in-situ the fretting wear processes of a laser-alloyed coatings and plasma-sprayed hydroxyapatite (HA) coatings against stainless steel under unlubricated conditions. X-ray images clearly showed the contact nature, the wear process, the formation and compaction of wear debris, spallation of the coatings, large-scale removal of materials, crack formation and propagation, etc. According to the analysis of X-ray images, the fretting wear process of laser-treated specimens was a combination of adhesive, abrasive, oxidative and delamination wear; and the fretting wear mechanisms for the plasma-sprayed HA coating were mainly delamination and abrasive wear. It can be concluded that X-ray imaging is a promising method for the in-situ observation of wear processes and deterioration mechanisms of coatings under fretting conditions.

Item Type: Article
Uncontrolled Keywords: Fretting wear; In-situ observation; Surface coatings; Wear mechanisms; X-ray imaging
Subjects: F200 Materials Science
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Becky Skoyles
Date Deposited: 27 Mar 2015 11:32
Last Modified: 24 Oct 2017 08:55
URI: http://nrl.northumbria.ac.uk/id/eprint/21900

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