The tribological behaviour of glass filled polytetrafluoroethylene(PTFE) under dry and water lubrication

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dc.contributor.advisorMarcus, Kashifen_ZA
dc.contributor.authorKlaas, Nkosana Ven_ZA
dc.date.accessioned2014-10-18T05:57:56Z
dc.date.available2014-10-18T05:57:56Z
dc.date.issued2003en_ZA
dc.descriptionIncludes bibliographical references.en_ZA
dc.description.abstractThis study was aimed at establishing the tribological behaViour of 25 % wt glass fibre filled polytetrafluoroethylene (PTFE) under dry sliding conditions. The experimental work was extended to compare and include its wear behaviour with other fillers such as bronze, carbon and graphite and to conduct tests under under water lubrication. Polyester-based materials, Vesconite and Vesconite Hilube, were used in this study for comparison purposes as well. The worn polymer pin surfaces and the counterfaces were studied by means of optical microscopy, scanning electron microscopy (SEM), energy dispersive spectroscopy (EOS), x-ray photoelectron spectroscopy (XPS) and surface profilometry. X-ray diffraction (XRO) and differential scanning calorimetry (OSC) were employed to study the changes in crystallinity and morphology of PTFE composite wear surfaces during the sliding process. The effect of the different forms of glass, viz. glass fibres, glass beads (hollow and solid beads) and glass flakes on the friction and wear behaviour of PTFE was investigated. The effect of additions of small amounts of additive such as molybdenum disulphide, MoS₂ and pigments on the wear rate of glass fibre filled PTFE was also investigated. The results show that the addition of glass fillers to PTFE reduce the wear of PTFE by three orders magnitude while keeping the coefficient of friction more or less unchanged. The reduction in wear upon addition of the glass to PTFE was attributed to the formation of a coherent and adherent transfer film to the counterface during the sliding process. The transfer film formed by unfilled PTFE was quite patchy and non-adherent to the metal counterfaces.en_ZA
dc.identifier.apacitationKlaas, N. V. (2003). <i>The tribological behaviour of glass filled polytetrafluoroethylene(PTFE) under dry and water lubrication</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering. Retrieved from http://hdl.handle.net/11427/8596en_ZA
dc.identifier.chicagocitationKlaas, Nkosana V. <i>"The tribological behaviour of glass filled polytetrafluoroethylene(PTFE) under dry and water lubrication."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 2003. http://hdl.handle.net/11427/8596en_ZA
dc.identifier.citationKlaas, N. 2003. The tribological behaviour of glass filled polytetrafluoroethylene(PTFE) under dry and water lubrication. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Klaas, Nkosana V AB - This study was aimed at establishing the tribological behaViour of 25 % wt glass fibre filled polytetrafluoroethylene (PTFE) under dry sliding conditions. The experimental work was extended to compare and include its wear behaviour with other fillers such as bronze, carbon and graphite and to conduct tests under under water lubrication. Polyester-based materials, Vesconite and Vesconite Hilube, were used in this study for comparison purposes as well. The worn polymer pin surfaces and the counterfaces were studied by means of optical microscopy, scanning electron microscopy (SEM), energy dispersive spectroscopy (EOS), x-ray photoelectron spectroscopy (XPS) and surface profilometry. X-ray diffraction (XRO) and differential scanning calorimetry (OSC) were employed to study the changes in crystallinity and morphology of PTFE composite wear surfaces during the sliding process. The effect of the different forms of glass, viz. glass fibres, glass beads (hollow and solid beads) and glass flakes on the friction and wear behaviour of PTFE was investigated. The effect of additions of small amounts of additive such as molybdenum disulphide, MoS₂ and pigments on the wear rate of glass fibre filled PTFE was also investigated. The results show that the addition of glass fillers to PTFE reduce the wear of PTFE by three orders magnitude while keeping the coefficient of friction more or less unchanged. The reduction in wear upon addition of the glass to PTFE was attributed to the formation of a coherent and adherent transfer film to the counterface during the sliding process. The transfer film formed by unfilled PTFE was quite patchy and non-adherent to the metal counterfaces. DA - 2003 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2003 T1 - The tribological behaviour of glass filled polytetrafluoroethylene(PTFE) under dry and water lubrication TI - The tribological behaviour of glass filled polytetrafluoroethylene(PTFE) under dry and water lubrication UR - http://hdl.handle.net/11427/8596 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/8596
dc.identifier.vancouvercitationKlaas NV. The tribological behaviour of glass filled polytetrafluoroethylene(PTFE) under dry and water lubrication. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 2003 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/8596en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Mechanical Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherMechanical Engineeringen_ZA
dc.titleThe tribological behaviour of glass filled polytetrafluoroethylene(PTFE) under dry and water lubricationen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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