PDF Publication Title:
Text from PDF Page: 006
264 Friction 3(4): 259–265 (2015) the lower steady-state friction coefficient observed in the samples tested in atmospheric air at 80 °C. Moreover, according to McCook et al. [12], the relative humidity present in atmospheric air increases the friction coefficient of the PEEK matrix running against the metallic surfaces. Therefore, it is reasonable to assume that during running-in and steady-state regimes at low temperatures, the adhesive interfacial forces are governed by interactions between the PEEK matrix and the metallic surface, rather than the tribo-layer. In other words, the tribo-layers during running-in regimes and steady-state regimes at low temperatures were not thick enough to be effective. 4 Conclusions 1. PEEK composite wear rates were drastically affected by the test temperature, but no significant atmos- pheric dependence was detected. 2. Sliding tests wore AISI 304 stainless steel counter bodies under all testing conditions, resulting in an increased surface roughness (Rq) but no volumetric losses. 3. Graphite-based tribo-layers were observed on counter body surfaces after the sliding tests. 4. Higher test temperatures enhanced the formation of tribo-layers, and the presence of humid atmospheric air resulted in graphite structures with greater disor- der, and consequently lower friction coefficients. 5. Without an effective tribo-layer, the presence of humidity in atmospheric air enhanced the system’s friction coefficient. 6. The friction of samples tested in a dry tetrafluoroe- thane atmosphere showed no significant temperature dependence. Acknowledgements The authors wish to thank CNPq, FAPESC and Capes/ Proex for financial support. Open Access: This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distri- bution, and reproduction in any medium, provided the original author(s) and source are credited. References [1] Lorentzen G. The use of natural refrigerants—A complete solution to the CFC/HCFC predicament. Int J Refrig 18(3): 190–197 (1995) [2] Sheiretov T, Vanglabbeek W, Cusano C. Evaluation of the tribological properties of polyimide and poly(amide-imide) polymers in a refrigerant environment. Tribol Transs 38(4): 914–922 (1995) [3] Cannaday M L, Polycarpou A A. Tribology of unfilled and filled polymeric surfaces in refrigerant environment for com- pressor applications. Tribol Lett 19(4): 249–262 (2005) [4] Demas N G, Polycarpou A A. Tribological performance of PTFE-based coatings for air-conditioning compressors. Surf Coat Tech 203(3–4): 307–316 (2008) [5] Dascalescu D, Polychronopoulou K, Polycarpou A A. The significance of tribochemistry on the performance of PTFE- based coatings in CO2 refrigerant environment. Surf Coat Tech 204(3): 319–329 (2009) [6] Nunez E E, Yeo S M, Polychronopoulou K, Polycarpou A A. Tribological study of high bearing blended polymer-based coatings for air-conditioning and refrigeration compressors. Surf Coat Tech 205(8–9): 2994–3005 (2011) [7] Yeo S M, Polycarpou A A. Tribological performance of PTFE- and PEEK-based coatings under oil-less compressor conditions. Wear 296(1–2): 638–647 (2012) [8] Solzak T A, Polycarpou A A. Tribology of WC/C coatings for use in oil-less piston-type compressors. Surf Coat Tech 201(7): 4260–4265 (2006) [9] De Mello D B, Binder R, Demas N G, Polycarpou A A. Effect of the actual environment present in hermetic compressors on the tribological behaviour of a Si-rich multifunctional DLC coating. Wear 267(5–8): 907–915 (2009) [10] Oil-less linear compressor launched. Cooling spot. http:// www.coolingpost.com/world-news/oil-less-linear-compress or-launched/, 2014. [11] Schroeder R, Torres F W, Binder C, Klein A N, De Mello D B. Failure mode in sliding wear of PEEK based composites. Wear 301(1–2): 717–726 (2013) [12] McCook N L, Hamilton M A, Burris D L, Sawyer W G. Tribological results of PEEK nanocomposites in dry sliding against 440C in various gas environments. Wear 262(11–12): 1511–1515 (2007) [13] Stachowiak G W, Batchelor A W. Engineering Tribology. Oxford (UK): Butterworth-Heinemann, 2005. [14] Briscoe B J, Sinha S K. Wear of polymers. J Eng Tribol 216(J6): 401–413 (2002)PDF Image | Effect of temperature and atmosphere on the tribological behavior of a polyether ether ketone composite
PDF Search Title:
Effect of temperature and atmosphere on the tribological behavior of a polyether ether ketone compositeOriginal File Name Searched:
tribological-Effect-Temperature-Atmosphe.pdfDIY PDF Search: Google It | Yahoo | Bing
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
IT XR Project Redstone NFT Available for Sale: NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Be part of the future with this NFT. Can be bought and sold but only one design NFT exists. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Turbine IT XR Project Redstone Design: NFT for sale... NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Includes all rights to this turbine design, including license for Fluid Handling Block I and II for the turbine assembly and housing. The NFT includes the blueprints (cad/cam), revenue streams, and all future development of the IT XR Project Redstone... More Info
Infinity Turbine ROT Radial Outflow Turbine 24 Design and Worldwide Rights: NFT for sale... NFT for the ROT 24 energy turbine. Be part of the future with this NFT. This design can be bought and sold but only one design NFT exists. You may manufacture the unit, or get the revenues from its sale from Infinity Turbine. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Supercritical CO2 10 Liter Extractor Design and Worldwide Rights: The Infinity Supercritical 10L CO2 extractor is for botanical oil extraction, which is rich in terpenes and can produce shelf ready full spectrum oil. With over 5 years of development, this industry leader mature extractor machine has been sold since 2015 and is part of many profitable businesses. The process can also be used for electrowinning, e-waste recycling, and lithium battery recycling, gold mining electronic wastes, precious metals. CO2 can also be used in a reverse fuel cell with nafion to make a gas-to-liquids fuel, such as methanol, ethanol and butanol or ethylene. Supercritical CO2 has also been used for treating nafion to make it more effective catalyst. This NFT is for the purchase of worldwide rights which includes the design. More Info
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
Infinity Turbine Products: Special for this month, any plans are $10,000 for complete Cad/Cam blueprints. License is for one build. Try before you buy a production license. May pay by Bitcoin or other Crypto. Products Page... More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)