Tribological Properties of Polyether–Ether–Ketone-Based Coating under Mixed and Boundary Aviation Kerosene-Lubrication Condition
Abstract
:1. Introduction
2. Experiments
2.1. Material Preparation
2.2. Friction Test
3. Results and Discussions
3.1. Scuffing Test
3.2. Stribeck Curve Test
3.3. Constant Load Test: 1000 N (3.46 MPa), 2200 r/min (5.3 m/s)
3.3.1. Short Test
3.3.2. Long Test
3.3.3. SEM Analysis
3.4. Strengthened Load Test: 1300 N (4.50 Mpa), 2200 r/min (5.3 m/s)
4. Conclusions
- (1)
- Scuffing experiments showed that the PEEK-based coating had a good scuffing resistance against the 38CrMoAlA and ZQPb17-4-4 counterparts. It is presumed that the PEEK-based coating acted as a solid lubricant between the sliding pairs.
- (2)
- The Stribeck curve test showed that the lubrication state of the PEEK-based coating against the counterparts was related closely to the tribofilm, and compared with ZQPb17-4-4, the PEEK-based coating against 38CrMoAlA was more likely to enter the mixed lubrication state from the boundary lubrication state.
- (3)
- In the constant load short test, the PEEK-based coating had a lower wear rate with ZQPb17-4-4. However, in the long test, the PEEK-based coating against 38CrMoAlA had a better performance with a smaller friction coefficient and a lower wear rate. Especially in the special stage, the wear rate was only 1/5 of the running-in stage.
- (4)
- In the strengthened load test, the friction and wear performance of the PEEK-based coating against 38CrMoAlA was far better than that against ZQPb17-4-4, so the friction pair that is composed of the PEEK-based coating and 38CrMoAlA is more competent for use in fuel pumps.
Author Contributions
Funding
Conflicts of Interest
References
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Material | Hardness | Thickness (μm) | Roughness, Rq (μm) |
---|---|---|---|
QT600-3 | 600 HV | - | 0.52 |
PEEK-based coating | 160 HV | 43 | 2.8 |
38CrMoAlA | 720 HV | - | 0.36 |
ZQPb17-4-4 | 310 HV | - | 0.36 |
Test Type | Load (N) | Speed (r/min) | Length of Time (min) |
---|---|---|---|
Scuffing | Step load 100 N/min | 2000 | Until the end of the test |
Stribeck curve | 300 | Step speed 400 r/10 min | 60 |
Constant load | 1000 | 2200 | Short test for 20 min; long test against 38CrMoAlA for 210 min, against ZQPb17-4-4 for 180 min |
Strengthened load | 1300 | 2200 | No more than 180 min |
PEEK-Based Coating | Running-in ws (mm3N−1m−1) × 10−8 | Stable ws (mm3N−1m−1) × 10−8 | Special Friction Coefficient |
---|---|---|---|
against 38CrMoAlA | 8.2 | 1.4 | 0.075 |
against ZQPb17-4-4 | 6.3 | 2.7 | 0.081 |
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Jiang, J.; Zhao, C.; Li, G. Tribological Properties of Polyether–Ether–Ketone-Based Coating under Mixed and Boundary Aviation Kerosene-Lubrication Condition. Coatings 2020, 10, 1. https://doi.org/10.3390/coatings10010001
Jiang J, Zhao C, Li G. Tribological Properties of Polyether–Ether–Ketone-Based Coating under Mixed and Boundary Aviation Kerosene-Lubrication Condition. Coatings. 2020; 10(1):1. https://doi.org/10.3390/coatings10010001
Chicago/Turabian StyleJiang, Jihai, Cunran Zhao, and Geqiang Li. 2020. "Tribological Properties of Polyether–Ether–Ketone-Based Coating under Mixed and Boundary Aviation Kerosene-Lubrication Condition" Coatings 10, no. 1: 1. https://doi.org/10.3390/coatings10010001