Elevated pitting wear of injection molded polyetheretherketone (PEEK) rolls |
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Authors: | M Berer Z Major G Pinter |
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Affiliation: | 1. Polymer Competence Center Leoben GmbH, Roseggerstrasse 12, 8700 Leoben, Austria;2. Institute for Polymer Product Engineering, Johannes Kepler University of Linz, Altenberger Strasse 69, 4040 Linz, Austria;3. Materials Science and Testing of Polymers, Montanuniversität Leoben, Otto Gloeckel-Strasse 2, 8700 Leoben, Austria |
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Abstract: | The increased pitting wear of PEEK rolls applied as bearing elements in drawer guide rails was investigated. Similar to findings for PEEK gear wheels the increased pitting occurred only in the presence of lubricants. Simple assumptions found in literature to explain this effect for PEEK gear wheels could be disproved within this research. Moreover, high irreversible deformations during the rolling process of PEEK rolls which were observed in a previous study were shown to not influence the mechanical properties of the surface material significantly. Additionally, the chemical analysis of the tribological system with Raman spectroscopy excluded a chemical reason for the intensified pitting. A detailed microscopic analysis of unstressed PEEK rolls combined with microtome cuts of the surfaces showed distinct pre-cracks in the outermost surface region which were not visible to the naked eye. Assuming a crack growth mechanism that was strongly supported by the fluid pressure of grease enclosed in the surface pre-cracks the injection molding process was adapted in order to improve the surface quality of the PEEK rolls. By this way the fatigue lifetime of the latter was increased by a factor of 2–3 which was crucial for the practical application. |
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