Antifriction and Mechanical Properties of the Thermoplastic Matrix of Polyetheretherketone-Based Composites
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friction and Mechanical Properties of the Thermoplastic Matrix of Polyetheretherketone-Based Composites S. V. Panina, b, *, Nguyen Duc Anhb, L. A. Kornienkoa, V. O. Alexenkoa, b, D. G. Buslovicha, b, and S. V. Shil’koc aInstitute
of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences, Tomsk, 634055 Russia b Tomsk Polytechnic University, Tomsk, 634050 Russia c Bely Institute of Mechanics of Metal–Polymer Systems, National Academy of Sciences of Belarus, Gomel, 246050 Belarus *e-mail: [email protected] Received July 11, 1919; revised April 13, 2020; accepted April 29, 2020
Abstract—The structure and mechanical and tribological properties of composites based on a thermoplastic matrix of polyetheretherketone (PEEK) loaded with carbon fibers of various (nano-, micro and millimeter) sizes were studied. The research is aimed at developing composites applicable for use both in metal–polymer and ceramic–polymer tribojoints, including endoprostheses. It is shown that the surface layer of the PEEK composite loaded with carbon nanofibers can play a damping role in the friction process. This ensures an increased in wear resistance by 1.5–2 times. Carbon fibers of micron and millimeter length play a reinforcing role. Thus, the wear resistance of PEEK composites can be increased up to seven times in metal–polymer tribojoints, while this is reduced by 16 times in ceramic–polymer tribojoints. It is shown that by choosing the type and weight fraction of fiberlike fillers (carbon nano/micro/millimeter fibers) in PEEK matrix, the tribological and mechanical properties can be purposefully increased. This makes it possible to expand areas of application and product range for tribojoints in mechanical engineering and medicine, including those formed using additive technologies. Keywords: metal–polymer tribojoints, ceramic–polymer tribojoints, endoprosthesis, antifrictional composites, polyetheretherketone, supramolecular structure, carbon fibers, wear resistance, mechanical properties DOI: 10.3103/S1068366620040091
INTRODUCTION Polymer composites are widely used in tribotechnology due to the advantageous combination of manufacturability and antifriction properties. Materials for a matrix made of polyetheretherketone (PEEK), which have high strength, chemical and thermal resistance, and melt flow, which makes it possible to obtain products of complex shape by additive technology, are promising for critical applications [1–3]. In addition, the bioinertness and permeability to X-ray radiation in computed and magnetic resonance imaging facilitates the use of PEEK in orthopedics. However, a significant disadvantage of polyetheretherketone is low wear resistance. To increase the tribotechnical characteristics, functional fillers, including nanoscale ones, are introduced into the polyetheretherketone [4–6]. Thus, in [7], the antifriction characteristics of a composite based on PEEK with carbon nanofibers/nanotubes were determined and their role as a solid lubricant medium was discussed. Orthopedic joint prosthet
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