Effect of Friction Reducers with Unreinforced PEEK and Steel Counterparts in Oil Lubrication
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Tribological Method
3. Results
3.1. Rheological Characterization
3.2. Tribological Testing
3.2.1. Setup Phase: Dry Condition
3.2.2. Steel–Steel Contact
3.2.3. Steel–PEEK Contact
3.2.4. PEEK–Steel Contact
4. Wear Analysis: Microscope Images and Roughness Measurement
5. Discussion
6. Conclusions
- ○
- In steel-to-steel contact, GMOs exhibit a worse friction profile during and after preconditioning compared to the benchmark. However, when PEEK is involved, these effects are mitigated, likely due to a synergistic effect with PEEK or material dominance.
- ○
- Differences are observed in PEEK-on-steel and steel-on-PEEK contact due to distinct tribofilm formation mechanisms and contact characteristics influenced by geometry and material type.
- ○
- The PEEK ball deformation results in non-punctual contact with speed-independent, significantly higher friction, especially at high speeds. Conversely, a steel ball on a flat PEEK surface reduces friction due to non-punctual contact, PEEK disc deformation, and lower Hertzian pressure, particularly at high speeds.
- ○
- In the PEEK ball coupling, material effects, especially at high temperatures, outweigh the contribution of each friction reducer in reducing CoF. MoDTC remains superior even in the presence of PEEK, with only minor differences from other anti-FR additives.
- ○
- At low temperatures, all additives remain inactive, exhibiting friction profiles similar to non-additives.
- ○
- At medium temperatures, reductions in friction are observed at speeds below 0.2 m/s for steel–steel contact, and this effect is more pronounced in PEEK-on-steel contact, especially with the polymeric reducer.
- ○
- At higher temperatures with PEEK as a coupling, all friction reducers provide benefits compared to the reference “matrix.” In traditional steel–steel contact, GMO behaves similarly to the reference.
- ○
- Comparing the top performing FR with the reference oil, there is a reduction in friction of 22%, 21% and 37%, respectively, in steel–steel, PEEK–steel and steel–PEEK couplings. In the standard steel–steel coupling, two out of four FRs did not reduce friction; however, after conditioning in the presence of PEEK all reducer additives performed well and increased the savings.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Material | Commercial Name | Young Modulus [GPa] | Poisson’s Ratio [-] |
---|---|---|---|
Steel | AISI 52100 | 210 | 0.29 |
PEEK unfilled | VITREX 450G | 3.8 | 0.33 |
Lubricant Name | Kinematic Viscosity at 40 °C, cSt |
---|---|
No FR | 43.69 |
Polyetheramine | 43.20 |
MoDTC | 43.27 |
GMO | 43.58 |
Polymeric | 43.86 |
MTM Parameter | Value |
---|---|
Ball diameter, mm | 19.05 |
Nominal load, N | 40 |
SSR | 50% |
(Stribeck) Entrainment speed, m/s | From 2 to 0.02 |
(Stribeck) Temperature, °C | 40, 80, 120 |
(Stribeck) Duration, min | 5 |
Time duration for CoF calculation, seconds | 6 |
(Rubbing time) Entrainment speed, m/s | 0.02 |
(Rubbing time) Temperature, °C | 120 |
(Rubbing time) Duration, min | 120 |
Time duration for CoF calculation, seconds | 30 |
Phase | Curve Type | Temperature, °C |
---|---|---|
Low temperature | Stribeck | 40 |
Medium temperature | Stribeck | 80 |
High temperature | Stribeck | 120 |
Conditioning | Rubbing time | 120 |
After Conditioning | Stribeck | 120 |
Configuration and Lubricated Condition | PEEK on Steel in Dry Lubrication |
---|---|
Load | 40 N |
Time duration | 60 min |
Entertainment speed | 400 mm/s |
Temperature | Ambient |
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Massocchi, D.; Chatterton, S.; Lattuada, M.; Reddyhoff, T.; Dini, D.; Pennacchi, P. Effect of Friction Reducers with Unreinforced PEEK and Steel Counterparts in Oil Lubrication. Lubricants 2023, 11, 487. https://doi.org/10.3390/lubricants11110487
Massocchi D, Chatterton S, Lattuada M, Reddyhoff T, Dini D, Pennacchi P. Effect of Friction Reducers with Unreinforced PEEK and Steel Counterparts in Oil Lubrication. Lubricants. 2023; 11(11):487. https://doi.org/10.3390/lubricants11110487
Chicago/Turabian StyleMassocchi, Davide, Steven Chatterton, Marco Lattuada, Thomas Reddyhoff, Daniele Dini, and Paolo Pennacchi. 2023. "Effect of Friction Reducers with Unreinforced PEEK and Steel Counterparts in Oil Lubrication" Lubricants 11, no. 11: 487. https://doi.org/10.3390/lubricants11110487