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Tribological behaviour of the low and high viscosity peek at various testing scales

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Abstract
Polyetheretherketone (PEEK) has become most attractive as a sliding bearing material in industrial applications, due to its excellent thermal stability, good friction and wear resistance. These properties promote the material to be used in so called high performance tribological applications. However, fundamental mechanisms governing friction and wear are not yet fully understood and neither is the influence of composition parameters. An important parameter is PEEK’s viscosity during injection moulding which is heated up to semi-solid state, between its glass transition and melting temperature. It is not known to what extent the injection viscosity, related to the applied temperature profile, affects subsequent tribological features. This paper studies the friction and wear performance of low and high viscosity PEEK under dry reciprocating sliding contact. The tests were performed with small and large scale specimens under pin-on-plate and flat-on-flat configuration, respectively; to determine the transitions in tribological behaviour at different scales and to identify the applications limits. Tests were carried out at controlled atmosphere with 25 °C and a relative humidity of 50%. Parameters such as contact pressures and sliding speed were limited at 10 MPa and 20 mm/s, respectively; post mortem analyses were carried out by means of 2-D surface topography and optical microscopy. The results show that PEEK injected at high viscosity exhibits a tribological performance with a relatively high coefficient of friction and high wear rate compare to PEEK injected at low viscosity.
Keywords
injection viscosity, friction and wear., polyetheretherketone PEEK, sliding bearing

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Chicago
Rodriguez Fereira, Vanessa, Jacob Sukumaran, Yeczain Perez Delgado, Patrick De Baets, Amaia Igartua, Beatriz Fernandez, and Alois K Schlarb. 2012. “Tribological Behaviour of the Low and High Viscosity Peek at Various Testing Scales.” In Lubrication, Maintenance and Tribotechnology, ed. Ana Aranzabe, Amaya Igartua, Aitor Arnaiz, Estibaliz Aranzabe, and Javier Barriga, 145–149. Eibar, Spain: IK4-TEKNIKER.
APA
Rodriguez Fereira, V., Sukumaran, J., Perez Delgado, Y., De Baets, P., Igartua, A., Fernandez, B., & Schlarb, A. K. (2012). Tribological behaviour of the low and high viscosity peek at various testing scales. In A. Aranzabe, A. Igartua, A. Arnaiz, E. Aranzabe, & J. Barriga (Eds.), Lubrication, maintenance and tribotechnology (pp. 145–149). Presented at the Lubrication Maintenance and Tribotechnology (Lubmat 2012), Eibar, Spain: IK4-TEKNIKER.
Vancouver
1.
Rodriguez Fereira V, Sukumaran J, Perez Delgado Y, De Baets P, Igartua A, Fernandez B, et al. Tribological behaviour of the low and high viscosity peek at various testing scales. In: Aranzabe A, Igartua A, Arnaiz A, Aranzabe E, Barriga J, editors. Lubrication, maintenance and tribotechnology. Eibar, Spain: IK4-TEKNIKER; 2012. p. 145–9.
MLA
Rodriguez Fereira, Vanessa, Jacob Sukumaran, Yeczain Perez Delgado, et al. “Tribological Behaviour of the Low and High Viscosity Peek at Various Testing Scales.” Lubrication, Maintenance and Tribotechnology. Ed. Ana Aranzabe et al. Eibar, Spain: IK4-TEKNIKER, 2012. 145–149. Print.
@inproceedings{2964221,
  abstract     = {Polyetheretherketone (PEEK) has become most attractive as a sliding bearing material in industrial applications, due to its excellent thermal stability, good friction and wear resistance. These properties promote the material to be used in so called high performance tribological applications. However, fundamental mechanisms governing friction and wear are not yet fully understood and neither is the influence of composition parameters. An important parameter is PEEK{\textquoteright}s viscosity during injection moulding which is heated up to semi-solid state, between its glass transition and melting temperature. It is not known to what extent the injection viscosity, related to the applied temperature profile, affects subsequent tribological features. This paper studies the friction and wear performance of low and high viscosity PEEK under dry reciprocating sliding contact. The tests were performed with small and large scale specimens under pin-on-plate and flat-on-flat configuration, respectively; to determine the transitions in tribological behaviour at different scales and to identify the applications limits. Tests were carried out at controlled atmosphere with 25 {\textdegree}C and a relative humidity of 50\%. Parameters such as contact pressures and sliding speed were limited at 10 MPa and 20 mm/s, respectively; post mortem analyses were carried out by means of 2-D surface topography and optical microscopy. The results show that PEEK injected at high viscosity exhibits a tribological performance with a relatively high coefficient of friction and high wear rate compare to PEEK injected at low viscosity.},
  author       = {Rodriguez Fereira, Vanessa and Sukumaran, Jacob and Perez Delgado, Yeczain and De Baets, Patrick and Igartua, Amaia and Fernandez, Beatriz and Schlarb, Alois K},
  booktitle    = {Lubrication, maintenance and tribotechnology},
  editor       = {Aranzabe, Ana and Igartua, Amaya and Arnaiz, Aitor and Aranzabe, Estibaliz and Barriga, Javier },
  isbn         = {9788493206451},
  keyword      = {injection viscosity,friction and wear.,polyetheretherketone PEEK,sliding bearing},
  language     = {eng},
  location     = {Bilbao, Spain},
  pages        = {145--149},
  publisher    = {IK4-TEKNIKER},
  title        = {Tribological behaviour of the low and high viscosity peek at various testing scales},
  year         = {2012},
}