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Commenced in January 2007 Frequency: Monthly Edition: International Publications Count: 29414


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10002165
The Impact of Surface Roughness and PTFE/TiF3/FeF3 Additives in Plain ZDDP Oil on the Friction and Wear Behavior Using Thermal and Tribological Analysis under Extreme Pressure Condition
Abstract:
The use of titanium fluoride and iron fluoride (TiF3/FeF3) catalysts in combination with polutetrafluoroethylene (PTFE) in plain zinc- dialkyldithiophosphate (ZDDP) oil is important for the study of engine tribocomponents and is increasingly a strategy to improve the formation of tribofilm and provide low friction and excellent wear protection in reduced phosphorus plain ZDDP oil. The influence of surface roughness and the concentration of TiF3/FeF3/PTFE were investigated using bearing steel samples dipped in lubricant solution at 100°C for two different heating time durations. This paper addresses the effects of water drop contact angle using different surface; finishes after treating them with different lubricant combination. The calculated water drop contact angles were analyzed using Design of Experiment software (DOE) and it was determined that a 0.05 μm Ra surface roughness would provide an excellent TiF3/FeF3/PTFE coating for antiwear resistance as reflected in the Scanning electron microscopy (SEM) images and the tribological testing under extreme pressure conditions. Both friction and wear performance depend greatly on the PTFE/and catalysts in plain ZDDP oil with 0.05 % phosphorous and on the surface finish of bearing steel. The friction and wear reducing effects, which was observed in the tribological tests, indicated a better micro lubrication effect of the 0.05 μm Ra surface roughness treated at 100°C for 24 hours when compared to the 0.1 μm Ra surface roughness with the same treatment.
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References:

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[6] Gabi N. Nehme, Performance Testing and Analysis of Anti-Wear Additives in Engine Oil for Reducing Phosphorus content and Improving Tail Pipe Emissions. University of Texas at Arlington, PhD Dissertation 2004. Publication Number: AAI3138787, Volume: 65-07, Section: B, page: 3650.; 389 p
[7] Gabi N. Nehme, “Interaction of Fluorinated catalyst with plain ZDDP oil and commercial oil using 2 rpm cycles testing and DOE analysis under extreme boundary lubrication” In Proceeding of IJTC2010, STLE/ASME International joint Tribology Conference, San Francisco, California, IJTC-2010-paper # 41044.
[8] R. L. Elsenbaumer, Pranesh B. Aswath, Gabi Nehme et al…University of Texas at Arlington and Platinum Research Cooperation. European Coating Conference: Smart Coatings II Berlin Germany: June 16, 2003. Sponsored by Vincentz Verlag KG. High Performance Lubricants and Coatings by Catalyzed PTFE Modification of the Metal Surfaces. Pg 1- 10. (2003).
[9] Gabi N. Nehme, The Effect of FeF3/TiF3 catalysts on the Thermal and Tribological performance of Plain Oil ZDDP under Extreme Pressure Loading. Wear, Volume 278-279 (2012): 9-17
[10] Gabi N. Nehme, Interactions of fluorinated catalyst and polutetrafluoroethylene in two different plain zinc dialkyldithiophosphate oils and one fully formulated oil using design of experiment. Lubrication Science (2011), Volume 23, Issue 4, pages 181- 201
[11] Gabi N. Nehme, The Tribological Performance of Plain and Fully Formulated Commercial Engine Oil under 2 Different Rotational Speeds and Extreme Pressure Contact Using Design of Experiment. Tribology Transactions, 54(4), 568-588.
[12] Gabi N. Nehme, Tribological and thermal characteristics of reduced phosphorus plain ZDDP oil in the presence of PTFE/FeF3/TiF3 under optimized extreme loading condition and a break in period using two different rotational speeds. Wear, Volume 301 (2013): 747-752.
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