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Wear Performance Evaluation of Polymer Overlays on Engine Bearings
Ismail Ozdemir1, Bahattin Bulbul2, Ugur Kiracbedel2
1Materials and Surface Engineering Group, Chemnitz University of Technology, Erfenschlager Str. 73, 09125 Chemnitz, Germany.
Materials (Basel, Switzerland)
|August 10, 2024
Summary
A new polymer overlay significantly reduces friction and wear in engine bearings under extreme conditions. This advanced coating offers superior performance compared to current options, enhancing durability and preventing premature failure.
Area of Science:
- Tribology and Materials Science
- Mechanical Engineering
- Surface Engineering
Background:
- Modern engine bearings face challenges from mixed lubrication, low viscosity oils, and start-stop operation, leading to potential metal-to-metal contact and failure.
- These conditions necessitate advanced materials that can withstand excessive loads and maintain lubrication integrity.
- Polymer overlays are being explored to enhance the performance and lifespan of engine bearing surfaces.
Purpose of the Study:
- To investigate the friction and wear resistance of two polymer overlays applied to engine bearing surfaces.
- To compare the performance of a newly developed polymer overlay (NDP) against a conventional polymer overlay (CPO) under simulated extreme conditions.
- To identify key factors contributing to the effectiveness of polymer overlays in reducing friction and wear.
Main Methods:
- Two polymer overlays, approximately 13 µm thick, were applied to conventional engine bearing surfaces via a curing process.
- Friction and wear tests were conducted using a pin-on-disc setup under a 30 N load.
- Coefficient of friction (COF) and wear volume loss were measured for each overlay type.
Main Results:
- The newly developed polymer overlay (NDP, PAI-based coating) exhibited a lower coefficient of friction (0.155) and wear volume loss (0.010 cm³).
- The conventional polymer overlay (CPO) showed significantly higher values, with a COF of 0.378 and a wear volume loss of 0.024 cm³.
- The effectiveness of the NDP was attributed to optimized component ratios and the formation of a beneficial transfer film on the counter surface.
Conclusions:
- The newly developed polymer overlay (NDP) demonstrates superior friction and wear performance compared to the conventional polymer overlay (CPO).
- Optimized formulation of polymer coatings, including solid lubricants and wear-resistant additives, is critical for enhanced tribological properties.
- The formation of a transfer film is a key factor in achieving low friction and wear resistance in polymer-coated engine bearings.
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