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Ultralow wear Perfluoroalkoxy (PFA) and alumina composites
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2016 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 362-363, p. 179-185Article in journal (Refereed) Published
Abstract [en]

Fluoropolymers have unique mechanical, chemical, and tribological properties (low friction coefficients) but their use as solid lubricants is inhibited by high wear rates (1-5×10-4 mm3/Nm). The addition of certain types of α-alumina has been shown to reduce the wear rate of PTFE by over three orders of magnitude, but due to its extremely high molecular weight PTFE cannot be screw injection molded. However, PFA, a perfluorinated copolymer of tetrafluoroethylene (TFE) and a perfluorinated alkylvinyl ether (PAVE), can be. Teflon® PFA 340 samples with various weight fractions of α-alumina (0%, 5%, 7.5%, 10%) were injection molded, and samples from each mold were wear tested against stainless steel (P=6.3 MPa, v=50.8 mm/s). Experiments showed that the friction behavior of the PFA 340-α alumina composite was very close to that of both unfilled PFA 340 and PTFE-α alumina composites. The wear rate of unfilled PFA 340 was 1.4×10-4 mm3/Nm, and dropped to 4.0×10-8 mm3/Nm for the PFA-α alumina composites. Just as in the case of PTFE-α alumina composites, these PFA composites generated brown-colored tribofilms on both the polymer and metal surfaces, which were indicative of tribochemical changes. ATR-IR and FTIR spectra of each surface showed evidence for the generation of perfluorinated carboxylate salts and waters of hydration. This spectral similarity between PTFE and PFA 340 samples shows that the same tribological mechanism found in PTFE-α alumina composites is responsible for ultralow wear in PFA-α alumina composites as well. 

Place, publisher, year, edition, pages
Elsevier Ltd , 2016. Vol. 362-363, p. 179-185
Keywords [en]
Alumina, Fluoropolymers, PFA, Screw injection molding, Solid Lubricant, Wear, Carboxylation, Fluorine containing polymers, Fourier transform infrared spectroscopy, Friction, Injection molding, Lubricants, Polytetrafluoroethylenes, Screws, Solid lubricants, Stainless steel, Tribology, Wear of materials, Alumina composites, High molecular weight, Low friction coefficients, Spectral similarity, Tetrafluoroethylene, Three orders of magnitude, Tribological mechanism, Tribological properties
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Identifiers
URN: urn:nbn:se:ri:diva-56334DOI: 10.1016/j.wear.2016.06.003Scopus ID: 2-s2.0-84974846264OAI: oai:DiVA.org:ri-56334DiVA, id: diva2:1591306
Note

Funding details: National Science Foundation, NSF, 1463141; Funding text 1: This material is based upon work supported by the National Science Foundation under Grant No. 1463141 .

Available from: 2021-09-06 Created: 2021-09-06 Last updated: 2023-05-23Bibliographically approved

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Harris, Kathryn L

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