The Potential of Tribological Application of DLC/MoS2 Coated Sealing Materials
Abstract
:1. Introduction
2. Experimental Details
2.1. Test Materials and Coatings
2.2. Test Procedures
2.2.1. Ball on Disc Tests
2.2.2. Ring on Disc Tests
3. Results and Discussion
3.1. Characteristics of Coatings
3.1.1. Thickness of the Coatings
3.1.2. Chemical Composition
3.1.3. Microscopic Analysis
3.1.4. Surface Roughness
3.1.5. Surface Energy
3.2. Tribological Tests
3.2.1. Coefficient of Friction
3.2.2. Wear
4. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Coating | Thickness (nm) | Pre-treatment | Deposition | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Voltage (V) | Gas flow (sccm) | Sputtering source | Power (W) | Voltage (V) | Current (A) | Gas flow (sccm) | Pressure (mbar) | Rotation (rpm) | Duration (min) | Frequency (kHz) | ||
DLC | 300 | 3000 | 15 Ar + 5 O2 for 5 min, 20 Ar for 25 min | Graphite | 3000 | 577–578 | 5.21–5.22 | 42 Ar + 8 C2H2 | 2.3 × 10−3 | 5.00 | 68 | 80 |
150 | 579–582 | 5.22–5.19 | 23 | |||||||||
MoS2 | 300 | MoS2 | 500 | 462–455 | 1.10–1.15 | 50 Ar | 2.6 × 10−3 | 60 | ||||
150 | 468–461 | 1.10–1.13 | 30 | |||||||||
Hybrid_A | 300 | Graphite + MoS2 | C: 3000 MoS2: 54 | C: 602–601 MoS2: 270–258 | C: 4.95–4.93 MoS2: 0.20–0.19 | 50 Ar | 2.6 × 10−3 | 65 | ||||
Hybrid_B | 300 | C: 3000 MoS2: 255 | C: 604–600 MoS2: 402–403 | C: 4.98–5.01 MoS2: 0.64–0.66 | 54 | |||||||
150 | C: 602–610 MoS2: 405–404 | C: 5.01–4.96 MoS2: 0.65–0.67 | 27 | |||||||||
Hybrid_C | 300 | C: 3000 MoS2: 440 | C: 611–606 MoS2: 467–446 | C: 4.95–4.92 MoS2: 0.98–1.04 | 36 |
Material | Thickness (nm) | ||
---|---|---|---|
Set Value | Actual Value | Difference | |
DLC | 300 | 405.0 ± 18.2 | 35.1% |
DLC | 150 | 113.3 ± 5.8 | −24.1% |
MoS2 | 300 | 257.8 ± 19.2 | −13.9% |
MoS2 | 150 | 131.8 ± 7.5 | −12.2% |
Hybrid_A | 300 | 269.8 ± 14.0 | −9.7% |
Hybrid_B | 300 | 300.2 ± 8.4 | 0.4% |
150 | 116.8 ± 6.0 | −22.5% | |
Hybrid_C | 300 | 246.3 ± 9.5 | −17.8% |
Elements | Bonds | Peak Energy (eV) | FWHM (eV) | SF Al [34] | Ref. |
---|---|---|---|---|---|
C 1s | C–C/C–H | 284.8 | 1.4 | 1.0 | [33] |
C–O | 286.0 | 2.1 | [33] | ||
–COO | 288.4 | 2.5 | [33] | ||
Mo 3d | MoS2 | 229.0 | 2.0 | 5.6 | [33,35] |
MoO3 | 232.8 | 1.5 | [33,35] | ||
S 2p | S2− | 162.0 | 1.4 | 1.1 | [33,36] |
S22− | 163.6 | 1.4 | [37,38] | ||
S 2s | – | 226.4 | 2.2 | 1.4 | [38,39] |
Sample | Composition (%) | |||||||
---|---|---|---|---|---|---|---|---|
C | O | Mo | S | N | MoS2/MoO3 | S/Mo | ||
MoS2 | MoO3 | |||||||
300 nm DLC | 90.1 | 9.9 | – | – | – | – | – | – |
150 nm DLC | 89.5 | 10.5 | – | – | – | – | – | – |
300 nm MoS2 | 22.4 | 13.6 | 13.0 | 3.5 | 26.5 | 21.1 | 3.7 | 1.6 |
150 nm MoS2 | 27.4 | 15.3 | 12.1 | 3.7 | 24.5 | 17.0 | 3.2 | 1.6 |
300 nm Hybrid_A | 75.2 | 13.4 | 1.3 | 1.3 | 3.5 | 5.3 | 1.0 | 1.3 |
300 nm Hybrid_B | 60.3 | 16.5 | 2.5 | 2.8 | 6.7 | 11.3 | 0.9 | 1.3 |
150 nm Hybrid_B | 56.1 | 17.0 | 2.5 | 3.3 | 6.7 | 14.5 | 0.7 | 1.2 |
300 nm Hybrid_C | 38.4 | 21.6 | 2.6 | 5.7 | 8.2 | 23.5 | 0.5 | 1.0 |
Parameter | FKM | HNBR | NBR | TPU |
---|---|---|---|---|
Ra (µm) | 1.00 | 1.03 | 0.61 | 0.44 |
Rz (µm) | 6.74 | 5.59 | 3.69 | 3.98 |
Parameter | FKM | HNBR | NBR | TPU |
---|---|---|---|---|
Coefficient of thermal expansion (10−6/K) | 191 | 166 | 165 | 160 |
Thermal conductivity (W/(m·K)) | 0.24 | 0.15 | 0.26 | 0.06 |
Material | Best Coating | Worst Coating |
---|---|---|
FKM | 300 nm MoS2 | 300 nm Hybrid_A |
NBR | 300 nm Hybrid_A | 300 nm MoS2 |
HNBR | 300 nm DLC | 300 nm Hybrid_A |
TPU | 300 nm MoS2 | 300 nm DLC |
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Wang, C.; Hausberger, A.; Nothdurft, P.; Lackner, J.M.; Schwarz, T. The Potential of Tribological Application of DLC/MoS2 Coated Sealing Materials. Coatings 2018, 8, 267. https://doi.org/10.3390/coatings8080267
Wang C, Hausberger A, Nothdurft P, Lackner JM, Schwarz T. The Potential of Tribological Application of DLC/MoS2 Coated Sealing Materials. Coatings. 2018; 8(8):267. https://doi.org/10.3390/coatings8080267
Chicago/Turabian StyleWang, Chao, Andreas Hausberger, Philipp Nothdurft, Jürgen Markus Lackner, and Thomas Schwarz. 2018. "The Potential of Tribological Application of DLC/MoS2 Coated Sealing Materials" Coatings 8, no. 8: 267. https://doi.org/10.3390/coatings8080267