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Tribological Performance of PTFE-based Coating Modified with Microencapsulated [HMIM][NTf2] Ionic Liquid

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Abstract

In this work, a PTFE-based self-lubricating coating containing microencapsulated [HMIM][NTf2] ionic liquid (IL) lubricant is reported. The microcapsules, made of polysulphone, are prepared by solvent evaporation. In order to allow incorporation in the thin PTFE coating layer, which is applied by spraying, the capsules were produced with small sizes (below 10 μm). Their physico-chemical characterization is presented in terms of SEM/EDS, TGA, FTIR and particle size distribution analysis. It is shown that both the encapsulant material and the IL lubricant are able to withstand the high-temperature curing conditions necessary for the coating system used (380 °C during 30 min). Crossed-cylinders tribological testing of the applied coatings showed that incorporation of IL-containing capsules yields a reduction in coefficient of friction of up to 12 % when compared to the baseline formulation and a reduction of up to 70 % in wear rate under high load and low sliding speed conditions. The tribological behaviour of the modified coating is further assessed in different load and speed (P.V) combinations.

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Acknowledgments

This work was funded by Flupol Surface Engineering Lda and by FEDER funds through the Operational Programme for Competitiveness Factors —COMPETE, ON.2—O Novo Norte—North Portugal Regional Operational Programme and National Funds through FCT—Foundation for Science and Technology under the projects: PEst-C/EQB/UI0511, NORTE-07-0124-FEDER-000026—RL1_Energy. The authors would also like to acknowledge Flupol for performing the technical application of all coatings on the tested tracks.

Conflict of interest

Author P. Bandeira has received a Ph.D. Grant from Flupol.

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Authors and Affiliations

  1. Flupol, Surface Engineering, Lda, Rua da Central, 401, Campo, 4440-043, Valongo, Portugal

    Pedro Bandeira & Judith Monteiro

  2. CETRIB, Tribology, Vibration and Industrial Maintenance Unit, INEGI, Institute of Mechanical Engineering and Industrial Management, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal

    António Monteiro Baptista

  3. LEPABE – Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal

    Pedro Bandeira & Fernão D. Magalhães

Authors
  1. Pedro Bandeira
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  2. Judith Monteiro
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  3. António Monteiro Baptista
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  4. Fernão D. Magalhães
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Correspondence to Fernão D. Magalhães.

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Bandeira, P., Monteiro, J., Baptista, A.M. et al. Tribological Performance of PTFE-based Coating Modified with Microencapsulated [HMIM][NTf2] Ionic Liquid. Tribol Lett 59, 13 (2015). https://doi.org/10.1007/s11249-015-0545-y

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  • DOI: https://doi.org/10.1007/s11249-015-0545-y

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