Friction and Wear Characteristics of Microporous Interface Filled with Mixed Lubricants of M50 Steel at Different Loads
Abstract
:1. Introduction
2. Materials and Methods
2.1. Lubricants and Matrix Materials
2.2. Preparation of Self-Lubricating Materials
2.3. Friction Tests
3. Results and Discussion
3.1. The Interface of Micropores
3.2. Friction Coefficient and Wear Rate
3.3. Analysis of The Lubricating Mechanisms
3.3.1. The Worn Surfaces of M50
3.3.2. The Worn Surfaces of MMS and MMSC
3.3.3. The Lubrication Mechanisms of Sn–Ag–Cu and WhiskerCNT
4. Conclusions
- (1)
- MMSC had stable and distinguished tribological properties from 2 to 22 N owing to the lubricating effect of Sn–Ag–Cu and whiskerCNT.
- (2)
- Sn–Ag–Cu could precipitate to the worn surface via the combined influence of heat and force, and a lubricating layer with a good lubricating effect was formed on the worn surface.
- (3)
- The flow spreading behavior of Sn–Ag–Cu could repair the stress cracks on the worn surface to some extent, which further enhanced the tribological properties of the M50 material.
- (4)
- Under heavy loads higher than 12 N, the lubricating layer formed on the friction surface produced a large number of crack aggregation behaviors, which eventually caused the lubricating layer to be destroyed.
- (5)
- WhiskerCNT enhanced the strength of the lubricating layer, which could greatly reduce the damage of the lubricating layer under loads heavier than 12 N.
Author Contributions
Funding
Conflicts of Interest
References
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Elements | Cr | Si | V | Ni | C | Cu | Mo | Mn | Fe |
---|---|---|---|---|---|---|---|---|---|
Content | 4.00 | 0.30 | 1.00 | 0.20 | 0.75 | 0.15 | 4.2 | 0.35 | Balance |
LAM | Working Pressure | Powder Transport Capacity | Protective Gas | Laser Power |
3–5 mbar | 5–10 g/min | Ar | 2000 W |
Infiltration | Melting Temperature | Heating Power | Degree of Vacuum | Change of Pressure |
500–650 °C | 60–70 kW | 0.85–0.93 Pa | 0.70–0.80 MPa |
Elements | C | Cr | Fe | Sn | Ag | Cu | O |
---|---|---|---|---|---|---|---|
Contents | 0.31 | 1.93 | 47.11 | 22.3 | 14.3 | 2.01 | 10.2 |
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Liu, X.; Lu, Z.; Dong, H.; Cao, Y.; Qian, X. Friction and Wear Characteristics of Microporous Interface Filled with Mixed Lubricants of M50 Steel at Different Loads. Materials 2020, 13, 2934. https://doi.org/10.3390/ma13132934
Liu X, Lu Z, Dong H, Cao Y, Qian X. Friction and Wear Characteristics of Microporous Interface Filled with Mixed Lubricants of M50 Steel at Different Loads. Materials. 2020; 13(13):2934. https://doi.org/10.3390/ma13132934
Chicago/Turabian StyleLiu, Xiyao, Zhiwei Lu, Hao Dong, Yan Cao, and Xueming Qian. 2020. "Friction and Wear Characteristics of Microporous Interface Filled with Mixed Lubricants of M50 Steel at Different Loads" Materials 13, no. 13: 2934. https://doi.org/10.3390/ma13132934