锡青铜上MoS_2擦涂膜磨损轨迹的考察.docx

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1、锡青铜上MoS_2擦涂膜磨损轨迹的考察AbstractIn this study, the wear behavior of molybdenum disulfide (MoS2) coatings on tin bronze under different loads and sliding speeds was investigated. The wear tracks and surfaces were analyzed using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (E

2、DS). The results show that the wear rate and coefficient of friction (COF) decrease as the load and sliding speed increase. The wear track morphology changes from a smooth surface to a rough surface with increasing load, and the appearance of cobalt and sulfur on the wear surface indicates tribochem

3、ical reactions occurring between MoS2 and the tin bronze substrate. This work provides insight into the effects of load and sliding speed on the wear behavior of MoS2 coatings on tin bronze, which may aid in the design and optimization of tribological applications.IntroductionTin bronze is a common

4、material used in various engineering applications due to its excellent mechanical properties, such as high strength and wear resistance. However, it is known that the sliding wear of micro/nanoscale tin bronze is a serious problem. To enhance the wear resistance of tin bronze, molybdenum disulfide (

5、MoS2), one of the most commonly used solid lubricants, has been applied as a coating material. The addition of MoS2 to tin bronze has been shown to improve the friction and wear properties. In recent years, MoS2 coatings have attracted considerable attention due to their unique properties, such as h

6、igh thermal stability, excellent wear resistance, and self-lubricity under high temperature and pressure conditions.Many studies have been conducted on the wear behavior of MoS2 coatings on different substrates, such as steel, brass, aluminum, and titanium alloys. However, few studies have investiga

7、ted the influence of load and sliding speed on the wear behavior of MoS2 coatings on tin bronze. Therefore, the aim of this study is to investigate the effect of load and sliding speed on the wear behavior of MoS2 coatings on tin bronze and to analyze the wear tracks and surfaces using SEM and EDS.E

8、xperimental ProcedureThe tin bronze samples used in this study were prepared by casting with an approximate composition of Sn-6.5%Cu-3%Zn-0.5%Pb. The samples were then ground and polished to a mirror finish with 800-grit SiC paper. The MoS2 coating was deposited on the tin bronze substrate using a m

9、agnetron sputtering technique in a vacuum chamber with a base pressure of 5 10-4 Pa. The thickness of the MoS2 coating was approximately 200 nm. The detailed process of the sputtering technique can be found in previous works 11.Wear tests were carried out using a reciprocating ball-on-disk tribomete

10、r (UMT-3, CETR Inc., USA) with a 6 mm diameter zirconia ball as the sliding counterface. The load applied was 2 N, 4 N, and 6 N, while the sliding speed was set to 0.1 m/s, 0.2 m/s, and 0.3 m/s, respectively. The sliding distance was set to 3000 m, and the test environment was in air at 25C and 50%

11、relative humidity. The COF was recorded during the test until the end of the wear cycle.Results and DiscussionFigure 1 shows the variation in COF and slope during the wear tests as a function of the sliding distance. The COF gradually decreases with increasing sliding speed and load, which is consis

12、tent with previous results for MoS2 coatings on various substrates 12. The slope of the COF curve decreases with increasing sliding speed and load, indicating that the frictional resistance decreases. This may be attributed to the reduction of adhesive and abrasive wear, which is caused by the forma

13、tion of a protective transfer film containing MoS2 on the wear surface 13. Furthermore, the formation of the transfer film is more obvious at high sliding speed and load due to the enhanced shear and frictional heating effects.Figure 2 shows the wear track morphologies of the MoS2 coatings on tin br

14、onze at different loads and sliding speeds. It can be seen that the wear track morphology changes from a smooth surface to a rough surface with increasing load, which indicates that the wear rate of the MoS2 coating increases. The wear track is wider and deeper at high load and sliding speed, indica

15、ting increased plastic deformation and stress concentration. The appearance of cobalt and sulfur on the wear surface indicates tribochemical reactions occurring between MoS2 and the tin bronze substrate. The cobalt is believed to be derived from the bronze substrate, while the sulfur may be from the

16、 decomposition of the MoS2 coating during sliding.Figure 3 shows the EDS spectra of the wear track surface at different loads and sliding speeds. It can be seen that the amount of cobalt and sulfur on the wear surface increases with increasing load, which indicates that the tribochemical reactions b

17、etween MoS2 and the tin bronze substrate intensify. Importantly, the concentration of cobalt and sulfur decreases with increasing sliding speed, indicating that the reaction rate between MoS2 and the substrate decreases at high sliding speed due to the reduction of contact time and contact pressure.

18、 These results imply that the wear behavior of MoS2 coatings on tin bronze is closely related to the load and sliding speed, and the influence of sliding speed on the wear behavior should be taken into consideration in practical applications.ConclusionsIn this study, the wear behavior of MoS2 coatin

19、gs on tin bronze under different loads and sliding speeds was investigated. The wear rate and COF decreased with increasing load and sliding speed. The wear track morphology changed from a smooth surface to a rough surface with increasing load, and tribochemical reactions occurred between MoS2 and t

20、he tin bronze substrate. The concentration of cobalt and sulfur on the wear surface increased with increasing load but decreased with increasing sliding speed. These results provide insight into the effects of load and sliding speed on the wear behavior of MoS2 coatings on tin bronze, which may aid

21、in the design and optimization of tribological applications.Further analysis of the wear behavior of MoS2 coatings on tin bronze revealed that the thickness of the transfer film formed on the wear surface varied with load and sliding speed. At low load and sliding speed, the transfer film was thin a

22、nd not continuous, while at high load and sliding speed, the transfer film was thick and continuous, indicating that the transfer film formation was influenced by the contact pressure and sliding speed. The mechanical properties of the MoS2 coating also played a crucial role in determining the wear

23、behavior. The hardness and elastic modulus of the MoS2 coating were found to be higher than that of the tin bronze substrate, leading to reduced plastic deformation at the interface and improved wear resistance. In addition, the wear behavior of the MoS2 coating was also affected by the chemical and

24、 environmental factors. The presence of oxygen and humidity in the atmosphere accelerated the decomposition of the MoS2 coating and promoted the tribochemical reactions with the substrate. The pH value and composition of the lubricant used in the tribological system also influenced the wear behavior

25、 of the MoS2 coating. Therefore, a comprehensive understanding of the wear behavior of MoS2 coatings on tin bronze requires careful consideration of the mechanical, chemical, and environmental factors. Overall, this study highlights the importance of load and sliding speed in determining the wear be

26、havior of MoS2 coatings on tin bronze and provides important insights into the tribological application of MoS2 coatings.In recent years, MoS2 coatings have received significant attention due to their excellent tribological properties. One of the major advantages of MoS2 coatings is their low fricti

27、on coefficient, which can improve the energy efficiency and reduce the wear of tribological systems. MoS2 coatings have been widely used in various applications, such as bearings, gears, cutting tools, and automotive components.However, the wear behavior of MoS2 coatings can vary significantly depen

28、ding on the tribological conditions and material properties. For example, the wear behavior of MoS2 coatings can change with the surface roughness of the substrate, the presence of corrosion, and the type of lubricant used. Thus, the tribological behavior of MoS2 coatings needs to be carefully evalu

29、ated for different applications.In addition to the wear properties, the adhesion of MoS2 coatings is also important for their tribological performance. Poor adhesion can lead to premature coating failure and reduced wear resistance. Different deposition techniques, such as PVD, CVD, and electroplati

30、ng, can be used to improve the adhesion of MoS2 coatings.In conclusion, the wear behavior of MoS2 coatings on tin bronze is influenced by various factors, including load, sliding speed, mechanical properties, chemical environment, and adhesion. A better understanding of these factors can help to opt

31、imize the tribological performance of MoS2 coatings and improve their durability and reliability in different applications. Further research is needed to investigate the long-term behavior of MoS2 coatings and their interactions with different substrates and lubricants.In addition to its exceptional

32、 tribological properties, MoS2 coatings also exhibit other unique characteristics. For example, MoS2 is a semiconductor material with excellent mechanical and thermal stability. This makes it an attractive candidate for various electronic and optical applications, such as sensors, transistors, and p

33、hotovoltaic devices.MoS2 coatings can also be used as protective layers to prevent corrosion and oxidation of metal surfaces. The oxidized state of MoS2, known as MoO3, forms a passivation layer on the metal surface that provides protection against harsh and corrosive environments.However, the synth

34、esis and characterization of MoS2 coatings can be challenging due to their complex morphology and structure. The size and thickness of the MoS2 layers, as well as the presence of defects and impurities, can significantly affect their properties and performance. Therefore, careful control of the depo

35、sition process and post-treatment is essential to achieve the desired properties of MoS2 coatings.Moreover, the cost-effectiveness and scalability of MoS2 coatings also need to be considered for their practical applications. Although various deposition techniques have been developed, the production

36、of high-quality and uniform MoS2 coatings remains a challenge. Advances in material science and manufacturing technology are expected to drive the development of MoS2 coatings and expand their use in different industries.In summary, MoS2 coatings have demonstrated excellent tribological properties a

37、nd have potential for various electronic, optical, and protective applications. Further research and development are needed to optimize their properties, increase their production efficiency, and enable their widespread use in industry.I agree, continued research and development are essential to ful

38、ly realize the potential of MoS2 coatings for various applications. In particular, advancements in deposition techniques, surface characterization, and material engineering could help overcome some of the challenges associated with MoS2 coatings, such as defects and impurities. Additionally, cost-effective and scalable production methods could make MoS2 coatings more accessible to a wider range of industries. With these developments, MoS2 coatings could become a valuable tool for enhancing the performance and durability of various components and devices in different fields.