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High Performance PPS Composites for Tribological Applications
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0002-4940-8176
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0001-9126-3938
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: 0000-0001-8676-8819
2019 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

Polyphenylene Sulfide(PPS) is known to possess superior mechanical and chemical properties, making it a suitable polymer for application as bearing material. In the trend of replacing metallic bearing materials with polymeric based materials, PPS based composites have been prepared in an effort to enhance its mechanical and tribological properties. Results have previously shown significant improvements in friction and wear behaviour by the addition of carbon reinforcements in both micro and nano scale range, in the form of i.e. short carbon fibers (SCFs) and nano diamonds (NDs). Based on these results, novel composites were processed and consolidated using injection moulding in our lab. Furthermore, to reduce the polymer ́s brittleness and improve its self-lubricity, polytetrafluoroethylene (PTFE) was blended with PPS matrix in the second part of the project. To understand the fundamental wear mechanisms, different wt% of PTFE were blended with PPS (from 10% to 90%) using high speed dry blending method. In addition, SCFs, NDs were used as reinforcement in the PPS/PTFE blend. The surface and bulk properties of the newly prepared multiscale composites were investigated by several characterisation methods including contact angle measurements and dilatometry to determine the linear coefficient of thermal expansion. Wear and the coefficient of friction were measured by a pin on disk tribometer by emphasising on different contact pressures and lubrication conditions. Improvements were observed with the addition of different reinforcements with SCFs in particular. The friction coefficient was reduced by over 50% while the specific wear rate was lower by a factor in the region of 4*102. The PTFE provided a significant effect on the polymer matrix tribological behaviour (almost at all wt%) as wear and friction were reduced significantly with respect to virgin PPS. The surface and transfer film formation were characterised on both the pin and counter surfaces by means of Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) to determine the effect of the added reinforcements on the wear behaviour and transfer film formation.

Place, publisher, year, edition, pages
2019.
Keywords [en]
PPS, tribology, wear, friction
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-87020OAI: oai:DiVA.org:ltu-87020DiVA, id: diva2:1592593
Conference
International Tribological Conference (ITC 2019), Sendai, Japan, September 17-21, 2019
Available from: 2021-09-09 Created: 2021-09-09 Last updated: 2023-09-05Bibliographically approved

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Somberg, JulianEmami, Nazanin

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Somberg, JulianJain, AyushLagrama, Kimberly RoseEmami, Nazanin
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Tribology (Interacting Surfaces including Friction, Lubrication and Wear)

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