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

UMIST

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Abstract

Self-healing tribocoatings are being developed for aerospace applications to improve the lifetime and
reduce the surface maintenance of components in motion. Here the tribo-induced self-healing behaviour
of a WS 2 /a-C 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. WS 2 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
Pages (from-to)	114124
Number of pages	5
Journal	Scripta Materialia
Volume	204
DOIs	https://doi.org/10.1016/j.scriptamat.2021.114124
Publication status	Published - 31 Jul 2021

Keywords

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

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10.1016/j.scriptamat.2021.114124Licence: CC BY

1-s2.0-S1359646221004048-mainFinal published version, 3.56 MBLicence: CC BY

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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 andreduce the surface maintenance of components in motion. Here the tribo-induced self-healing behaviourof a WS 2 /a-C 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 scratchdamage results in coating brittle fracture and spalling, and that Hertzian pressure affects healing rateat early stages of sliding. WS 2 nanocrystallites, formed via atomic rearrangement at flexural interfaces,enable the healing of irregular damages and congruently offer superlubrication in vacuum. Such damagecontrol 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",

author = "Huatang Cao and Mingwen Bai and Inkson, {Beverley J.} and Xiangli Zhong and {De Hosson}, {Jeff Th. M.} and Yutao Pei and Ping Xiao",

note = "Funding Information: 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 ?Friction: The Tribology Enigma?. 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. Funding Information: The WS 2 /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 {\textquoteleft}Friction: The Tribology Enigma{\textquoteright}. 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. Publisher Copyright: {\textcopyright} 2021 The Author(s)",

year = "2021",

month = jul,

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doi = "10.1016/j.scriptamat.2021.114124",

language = "English",

volume = "204",

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journal = "Scripta Materialia",

issn = "1359-6462",

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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 - Funding Information: 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 ?Friction: The Tribology Enigma?. 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. Funding Information: The WS 2 /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 ‘Friction: The Tribology Enigma’. 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. Publisher Copyright: © 2021 The Author(s)

PY - 2021/7/31

Y1 - 2021/7/31

N2 - Self-healing tribocoatings are being developed for aerospace applications to improve the lifetime andreduce the surface maintenance of components in motion. Here the tribo-induced self-healing behaviourof a WS 2 /a-C 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 scratchdamage results in coating brittle fracture and spalling, and that Hertzian pressure affects healing rateat early stages of sliding. WS 2 nanocrystallites, formed via atomic rearrangement at flexural interfaces,enable the healing of irregular damages and congruently offer superlubrication in vacuum. Such damagecontrol 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 andreduce the surface maintenance of components in motion. Here the tribo-induced self-healing behaviourof a WS 2 /a-C 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 scratchdamage results in coating brittle fracture and spalling, and that Hertzian pressure affects healing rateat early stages of sliding. WS 2 nanocrystallites, formed via atomic rearrangement at flexural interfaces,enable the healing of irregular damages and congruently offer superlubrication in vacuum. Such damagecontrol 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

U2 - 10.1016/j.scriptamat.2021.114124

DO - 10.1016/j.scriptamat.2021.114124

M3 - Article

SN - 1359-6462

VL - 204

SP - 114124

JO - Scripta Materialia

JF - Scripta Materialia

ER -

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

Abstract

Keywords

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