Self-healing WS2 tribofilms: An in-situ appraisal of mechanisms

Huatang Cao; Mingwen Bai; Beverley J Inkson; Xiangli Zhong; Jeff Th M De Hosson; Yutao Pei; Ping Xiao

doi:10.1016/j.scriptamat.2021.114124

Self-healing WS2 tribofilms: An in-situ appraisal of mechanisms

Huatang Cao, Mingwen Bai, Beverley J Inkson, Xiangli Zhong, Jeff Th M De Hosson, Yutao Pei, Ping Xiao

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11 Citations (Scopus)

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Abstract

Self-healing tribocoatings are being developed for aerospace applications to improve the lifetime and reduce the maintenance of surface components in motion. Here the tribo-induced self-healing behaviour of a WS2/aC tribocoating has been evaluated for the first time by in-situ scanning electron microscopy (SEM) to evaluate the mechanisms of damage and self-recovery. In-situ SEM imaging reveals that scratch damage results in coating brittle fracture and spalling, and that Hertzian pressure affects healing rate at early stages of sliding. WS2 nanocrystallites, formed via atomic rearrangement at flexural interfaces, enable the healing of irregular damages and congruently offer superlubrication in vacuum. Such damage control in tribo-service may make flawless coatings an unnecessary prerequisite in tribo-applications.

Original language	English
Article number	114124
Number of pages	5
Journal	Scripta Materialia
Volume	204
Early online date	31 Jul 2021
DOIs	https://doi.org/10.1016/j.scriptamat.2021.114124
Publication status	Published - Nov 2021

Bibliographical note

This is an open access article under the CC BY license.

Funder

Engineering and Physical Sciences Research Council (EPSRC) program grant EP/R001766/1 Henry Royce Institute for Advanced Materials, EPSRC grants EP/R00661X/1, EP/S019367/1, EP/P025021/1 and EP/P025498/1.

Funding

The WS2/a-C nanocomposite coating was deposited at University of Groningen, the Netherlands. M.W.B. and B.J.I. acknowledged the Engineering and Physical Sciences Research Council (EPSRC) for the program grant EP/R001766/1 as a part of \u2018Friction: The Tribology Enigma\u2019. P.X. acknowledged Royal Academy of Engineering and Rolls-Royce for appointment of Rolls-Royce/Royal Academy of Engineering Research Chair in Advanced Coating Technology. The authors are grateful for the Henry Royce Institute for Advanced Materials, funded through EPSRC grants EP/R00661X/1, EP/S019367/1, EP/P025021/1 and EP/P025498/1.

Keywords

In-situ Microscopy
Intelligent coating
Self-healing
Tribology
WS atomic arrangement

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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10.1016/j.scriptamat.2021.114124Licence: CC BY

PublishedFinal published version, 3.66 MBLicence: CC BY

Cite this

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title = "Self-healing WS2 tribofilms: An in-situ appraisal of mechanisms",

abstract = "Self-healing tribocoatings are being developed for aerospace applications to improve the lifetime and reduce the maintenance of surface components in motion. Here the tribo-induced self-healing behaviour of a WS2/aC tribocoating has been evaluated for the first time by in-situ scanning electron microscopy (SEM) to evaluate the mechanisms of damage and self-recovery. In-situ SEM imaging reveals that scratch damage results in coating brittle fracture and spalling, and that Hertzian pressure affects healing rate at early stages of sliding. WS2 nanocrystallites, formed via atomic rearrangement at flexural interfaces, enable the healing of irregular damages and congruently offer superlubrication in vacuum. Such damage control in tribo-service may make flawless coatings an unnecessary prerequisite in tribo-applications.",

keywords = "In-situ Microscopy, Intelligent coating, Self-healing, Tribology, WS atomic arrangement",

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AU - Cao, Huatang

AU - Bai, Mingwen

AU - Inkson, Beverley J

AU - Zhong, Xiangli

AU - De Hosson, Jeff Th M

AU - Pei, Yutao

AU - Xiao, Ping

N1 - This is an open access article under the CC BY license.

PY - 2021/11

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N2 - Self-healing tribocoatings are being developed for aerospace applications to improve the lifetime and reduce the maintenance of surface components in motion. Here the tribo-induced self-healing behaviour of a WS2/aC tribocoating has been evaluated for the first time by in-situ scanning electron microscopy (SEM) to evaluate the mechanisms of damage and self-recovery. In-situ SEM imaging reveals that scratch damage results in coating brittle fracture and spalling, and that Hertzian pressure affects healing rate at early stages of sliding. WS2 nanocrystallites, formed via atomic rearrangement at flexural interfaces, enable the healing of irregular damages and congruently offer superlubrication in vacuum. Such damage control in tribo-service may make flawless coatings an unnecessary prerequisite in tribo-applications.

AB - Self-healing tribocoatings are being developed for aerospace applications to improve the lifetime and reduce the maintenance of surface components in motion. Here the tribo-induced self-healing behaviour of a WS2/aC tribocoating has been evaluated for the first time by in-situ scanning electron microscopy (SEM) to evaluate the mechanisms of damage and self-recovery. In-situ SEM imaging reveals that scratch damage results in coating brittle fracture and spalling, and that Hertzian pressure affects healing rate at early stages of sliding. WS2 nanocrystallites, formed via atomic rearrangement at flexural interfaces, enable the healing of irregular damages and congruently offer superlubrication in vacuum. Such damage control in tribo-service may make flawless coatings an unnecessary prerequisite in tribo-applications.

KW - In-situ Microscopy

KW - Intelligent coating

KW - Self-healing

KW - Tribology

KW - WS atomic arrangement

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Self-healing WS2 tribofilms: An in-situ appraisal of mechanisms

Abstract

Bibliographical note

Funder

Funding

Keywords

ASJC Scopus subject areas

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