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  • 1.
    Emami, Nazanin
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
    Jain, Ayush
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
    High performance hybrid PPS polymer composites for tribological applications2017Conference paper (Refereed)
  • 2.
    Jain, Ayush
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics.
    Somberg, Julian
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
    Emami, Nazanin
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
    Development and Characterisation of Multi-Scale Carbon Reinforced PPS Composites for Tribological Applications2019In: Lubricants, E-ISSN 2075-4442, Vol. 7, no 4, article id 34Article in journal (Refereed)
    Abstract [en]

    Polymer-based materials show to be of increasing interest in replacing metal based materials in tribological applications due to their low weight, cost and easy manufacturability. To further reduce the environmental impact of these bearing materials recyclability is becoming more crucial, stimulating the need for high performing thermoplastic materials. In this study, polyphenylene sulfide (PPS) composites were prepared in an effort to enhance its tribological properties. Short carbon fibres (SCFs), graphene oxide (GO) and nano diamonds (NDs) as well as polytetrafluoroethylene (PTFE) were used as micro and nano reinforcements. The addition of SCFs especially decreased the linear coefficient of thermal expansions while enhancing the micro hardness and wettability of the polymer. Under water lubricated conditions, a decrease in friction up to 56% and a reduction of wear rate in the order of 103 was observed by the addition of SCF. The reduction in friction and wear was further enhanced by the addition of NDs, providing a synergistic effect of the reinforcements in micro and nano scale. By testing the individual reinforcements under dry conditions, PTFE and SCFs were especially effective in reducing friction while the release and consequent abrasion of NDs and SCFs increased the wear under a higher contact pressure.

  • 3.
    Somberg, Julian
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
    Jain, Ayush
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
    Lagrama, Kimberly Rose
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
    Emami, Nazanin
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
    High Performance PPS Composites for Tribological Applications2019Conference paper (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.

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