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Tribological properties of polyimide-graphene composite coatings at elevated temperatures
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0002-4893-0886
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0001-6085-7880
2020 (English)In: Progress in organic coatings, ISSN 0300-9440, E-ISSN 1873-331X, Vol. 142, article id 105602Article in journal (Refereed) Published
Abstract [en]

This paper focuses on developing a polyamic acid (PAA) of polyimide (PI) and PI filled with graphene (PI/GP) on 100CR6 ESU hardened steel. The tribological testing result of the pure PI and PI/GP against 100Cr6 steel ball at room temperature (RT) and elevated temperatures (50 °C, 100 °C, 150 °C, 200 °C) exhibits that the addition of GP clearly enhances the friction reduction and wear-resistant properties of PI, due to the excellent lubricating properties of GP. The 3 wt % of GP content in the PI is the optimum loading for the lowest friction and wear at RT and elevated temperatures. The SEM analysis of the worn surfaces showed that the high wear-resistant of the PI/GP composite is due to the generation of the loose particles from the coating surfaces which could be embedded on the friction pairs and rolled over there as a lubrication film. Also, at 60 % weight residue the PI/3 G P showed the high decomposition temperature.

Place, publisher, year, edition, pages
Elsevier, 2020. Vol. 142, article id 105602
Keywords [en]
Polyimide coating, Graphene, Tribological properties, Elevated temperature, Dry conditions
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-77830DOI: 10.1016/j.porgcoat.2020.105602Scopus ID: 2-s2.0-85079673422OAI: oai:DiVA.org:ltu-77830DiVA, id: diva2:1395731
Note

Validerad;2020;Nivå 2;2020-02-24 (alebob)

Available from: 2020-02-24 Created: 2020-02-24 Last updated: 2020-04-22Bibliographically approved

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Mu, LiwenShi, Yijun

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