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Publication Title | Effect of temperature and atmosphere on the tribological behavior of a polyether ether ketone composite

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Friction 3(4): 259–265 (2015) ISSN 2223-7690 DOI 10.1007/s40544-015-0091-5 CN 10-1237/TH
RESEARCH ARTICLE
Effect of temperature and atmosphere on the tribological behavior of a polyether ether ketone composite
Felipe Darabas RZATKI1,*, Diego Vinicius Dalevedo BARBOZA1, Renan Muller SCHROEDER2, Guilherme Mariz de Oliveira BARRA1, Cristiano BINDER1, Aloisio Nelmo KLEIN1, José Daniel Biasoli DE MELLO1
1 Federal University of Santa Catarina—UFSC, Mechanical Engineering Department, Materials Laboratory, Florianópolis, SC, Brazil
2 Whirlpool/Embraco, Joinville, SC, Brazil
Received: 29 June 2015 / Revised: 26 August 2015 / Accepted: 17 September 2015
© The author(s) 2015. This article is published with open access at Springerlink.com
Abstract: Polyether ether ketone (PEEK) is a high-performance thermoplastic, which is often selected for high- temperature tribological applications under chemically aggressive environments. The present work investigates the tribological behavior of a high-performance PEEK composite under conditions that are often found inside hermetic compressors. Therefore, an AMTI tribometer equipped with a hermetic chamber and a heating system was used to conduct sliding tests of PEEK cylinders on AISI 304 stainless steel polished discs (Sq <10 nm) with reciprocating movement and a normal force of 175 N. The tribological behavior of the PEEK/AISI 304 stainless steel system was investigated as a function of ambient temperature (30 °C and 80 °C) and atmosphere (atmospheric air and tetrafluoroethane). Wear and surface roughness analyses were performed with white light interferometry and optical microscopy. Raman spectroscopy was used to investigate transfer films on the counter body surface. Temperature was observed to have a strong influence on the tribological behavior of the samples tested under atmospheric air, with a 25% decrease in the friction coefficient associated with a 100% increase in the wear rate. However, the friction measured from the samples tested under a tetrafluoroethane atmosphere showed no significant temperature dependence.
Keywords: solid lubricant; thermoplastics; environment; temperature
1 Introduction
Over the recent decades, the refrigerant industry has introduced several different refrigerant fluids—a change that is generally driven by environmental issues [1−7]. More recently, the refrigerant industry has shown interest in oil-less compressors [8, 9]. This new genera- tion of products, in addition to having environmental benefits, attains new levels of efficiency and allows for the development of innovative refrigerators [10]. In this context, solid lubricant polymeric materials are a promising alternative to reduce the friction and wear in these lubricant-free systems. However, the harsh
* Corresponding author: Felipe Darabas RZATKI.
E-mail: felipe.darabas@labmat.ufsc.br
A preliminary version of this work was presented at the 2nd International Brazilian Conference on Tribology-TriboBr-2014, Foz do Iguaҫu, Paraná, Brazil, 2014.
operating conditions of hermetic compressors require the use of high-performance polymers. Compounds based on polyether ether ketone (PEEK) are certainly some of the most promising materials in current polymer tribology [11].
Few studies regarding the tribological behavior of polymeric materials under dry conditions and refrigerant atmospheres are available [2−7]. Cannaday and Polycarpou [3] found that a tetrafluoroethane atmosphere resulted in tribological properties that were slightly superior to those reported in atmospheric air for several polymeric materials and composites. Moreover, McCook et al. [12] reported that neat PEEK showed a lower friction coefficient and less wear under dry and vacuum environments. However, the effect of the ambient temperature on these systems remains unclear.

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