Effect of coating thickness on tribological properties of manganese phosphate conversion coating in different motion conditions

Zang, Libin; Zhong, Qinglun; Chen, Yong; Hou, Weijie; Zhao, Baoshan; Wu, Yimin

doi:10.1016/j.triboint.2022.107894

Cited by 13 publications

(3 citation statements)

References 40 publications

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“…The temperature of the phosphating solution stabilizes at 75°C, suspend the pretreated samples in the phosphating solution by hanging them without touching the inner wall of the beaker for a phosphating time of 10 min. Phosphate films were applied to achieve a prepared phosphate coating with a film thickness ranging from 4 to 7 μm, as they have been reported to exhibit excellent wear resistance (Zang et al , 2022). The micromorphology of the coatings was analyzed using a high-resolution field-emission scanning electron microscope (SEM; Nova NanoSEM450, FEI, USA).…”

Section: Experimental Materials Equipment and Methodsmentioning

confidence: 99%

Effect of composite solid lubricant coatings on the tribological performance of thrust cylindrical roller bearings

Xu,

Zhang

2023

ILT

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Purpose This study aims to form composite solid lubricant coatings on the surface of bearing steel, which can significantly improve the tribological properties of thrust cylindrical roller bearings (TCRBs). Phosphating films possess microscopic porosity that typically needs to be sealed with oil, grease or wax. Due to its unique crystal structure, the phosphating film itself also exhibits a certain degree of lubricity. In this study, solid lubricants are used to fill the pores of the phosphating film. By combining the phosphating film with solid lubricants, lubrication and wear reduction can be achieved. Design/methodology/approach In this study, the surfaces of the shaft washer (WS) and seat washer (GS) were treated with zinc-phosphating. Subsequently, a solid lubricant solution (polytetrafluoroethylene [PTFE], MoS2 and graphite) was sprayed onto the phosphated samples at concentrations of 1 , 2 and 3 g/L. The porous and adsorptive nature of the phosphating film was used to embed the solid lubricant particles into the film, thus forming a composite lubrication layer containing solid lubricants on the surface of the bearing steel. Findings The addition of solid lubricant materials has shown significant potential in reducing wear losses compared with phosphated samples without such additives. Increasing the amount of solid lubricant added can facilitate the formation of a transfer film, which further enhances the protective properties. However, it is important to note that excessive amounts of solid lubricant material can contribute to seizure, leading to increased wear losses of the cage and a higher average coefficient of friction (ACOF).By spraying a PTFE solution with a concentration of 2 g/L, the lowest ACOF and cage wear loss were achieved, resulting in reductions of 60.5% for the ACOF and 89.4% for the cage wear loss. Similarly, when spraying a graphite solution with a concentration of 3 g/L, the lowest wear losses for GS and WS were observed, with reductions of 51.7% for GS wear loss and 38.9% for WS wear loss. Originality/value The combination of the phosphating film and solid lubricants aims to achieve lubrication and wear reduction, providing a new approach to wear-resistant technology for TCRBs. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-07-2023-0231/

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Section: Experimental Materials Equipment and Methodsmentioning

confidence: 99%

Effect of composite solid lubricant coatings on the tribological performance of thrust cylindrical roller bearings

Xu,

Zhang

2023

ILT

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“…Thus, the application of quasi-zero stiffness system in the field of gravity compensation provides a good solution. Whereas, in the mechanical contact quasi-zero stiffness system, there is inevitably friction between contact pairs [ 17 ]. For these reasons, the magnetic quasi-zero stiffness has the characteristics of no friction, large load, and fast dynamic response [ 18 , 19 , 20 ], which provides a new idea for the constant supporting force with a heavy load, long stroke, and high precision in the vertical direction.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Investigations on High-Precision Micro-Low-Gravity Simulation Technology for Lunar Mobile Vehicle

Hou

Hao²,

Wang³

et al. 2023

Sensors

Self Cite

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With the development of space technology, the functions of lunar vehicles are constantly enriched, and the structure is constantly complicated, which puts forward more stringent requirements for its ground micro-low-gravity simulation test technology. This paper puts forward a high-precision and high-dynamic landing buffer test method based on the principle of magnetic quasi-zero stiffness. Firstly, the micro-low-gravity simulation system for the lunar vehicle was designed. The dynamic model of the system and a position control method based on fuzzy PID parameter tuning were established. Then, the dynamic characteristics of the system were analyzed through joint simulation. At last, a prototype of the lunar vehicle’s vertical constant force support system was built, and a micro-low-gravity landing buffer test was carried out. The results show that the simulation results were in good agreement with the test results. The sensitivity of the system was better than 0.1%, and the constant force deviation was 0.1% under landing impact conditions. The new method and idea are put forward to improve the micro-low-gravity simulation technology of lunar vehicles.

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“…There are three publications addressing most of the tribological properties of black oxide [12,15,23], and two publications on manganese phosphate [24,25] layers with tests performed in rolling/sliding contact conditions, but none of them compare the results to other conversion layers. Six publications compare some of the conversion layers under the same tribological conditions.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Various Conversion Layers for Improved Friction Performance of Railway Wheel-End Bearings

Broitman,

Ruellan,

Meeuwenoord

et al. 2023

Coatings

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With a growing global railway market which needs to reduce its energy consumption and emissions, railway wheel-end bearing units are being optimized to further reduce power losses with no compromise on reliability. One of the different solutions being evaluated is the selection of the optimum surface engineering. Inner and outer rings of railway bearing units are currently coated with a zinc-calcium phosphate conversion coating designed for anti-corrosion, anti-fretting, and mounting properties. In this study, different conversion layers, like zinc-calcium phosphate, manganese-phosphate and tribological black oxide, have been compared in terms of friction performance using a single-contact tribometer and a grease-lubricated bearing friction test rig. Results demonstrate that an optimum tribological black oxide conversion layer can reduce the bearing torque by up to 30% in both low and intermediate speeds relevant to intercity trains.

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Effect of coating thickness on tribological properties of manganese phosphate conversion coating in different motion conditions

Cited by 13 publications

References 40 publications

Effect of composite solid lubricant coatings on the tribological performance of thrust cylindrical roller bearings

Effect of composite solid lubricant coatings on the tribological performance of thrust cylindrical roller bearings

Theoretical and Experimental Investigations on High-Precision Micro-Low-Gravity Simulation Technology for Lunar Mobile Vehicle

Comparison of Various Conversion Layers for Improved Friction Performance of Railway Wheel-End Bearings

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