Tribological behavior of various ceramic materials sliding against CF/PTFE/graphite-filled PEEK under seawater lubrication

Yin, Fanglong; Ji, Hui; Nie, Songlin

doi:10.1177/1350650119845743

Cited by 15 publications

(9 citation statements)

References 31 publications

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“…The heat generated between the friction pairs shown in Figure 8B and the copper disc surface is shown in Figure 8C also confirms this. The secondary reason is that the quality of lubricating water film in water environment is of great significance to the tribological properties of friction pairs 39,40 . In the experiment, the water‐lubrication between friction pairs was not effective at 50 r/min.…”

Section: Resultsmentioning

confidence: 91%

“…The secondary reason is that the quality of lubricating water film in water environment is of great significance to the tribological properties of friction pairs. 39,40 In the experiment, the water-lubrication between friction pairs was not effective at 50 r/ min. The water film formed was relatively weak, and may not meet the lubrication requirements, so the friction coefficient was higher.…”

Section: Effect Of Loadingmentioning

confidence: 91%

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Development of modified polyacrylonitrile fibers for improving tribological performance characteristics of thermoplastic polyurethane material in water‐lubricated sliding bearings

Liang

Guo

Tian

et al. 2020

Polymers for Advanced Techs

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Thermoplastic polyurethane (TPU) is one of the most popular marine bearing materials because of its excellent characteristics. However, severe wear often occurs under some extreme conditions. In order to improve the service life of bearing material, this work introduced the polyacrylonitrile (PAN) fiber as a reinforcement material to further enhance TPU tribological properties. Considering that the bearing material does not process self-lubricating or cannot form a stable water film under some working conditions, the PAN fiber was hydrophilically modified to alleviate this problem. The effects of fiber addition, operation speed, and applied load on the tribological properties of the composites were examined by using a tribo-tester. The friction coefficient of the samples, the surface morphology after rubbing, and the wear loss, and so on, were also comprehensively analyzed. It was found that the friction coefficient of 30% modified PAN fiber at 500 r/min and 0.8 MPa load was 0.08, and its friction coefficient was 81.8% lower than the pure sample under the same working condition, this is mainly due to the high hydrophilicity of the modified PAN fiber, which makes it easier to form a water film between the composite material and the copper disc. Furthermore, adhesive wear occurred in unmodified samples, while modified samples contained abrasive wear. This new material modification method and design idea can be used for improving the performance of water-lubricated bearing materials. K E Y W O R D S modified PAN fiber, tribological properties, water-lubricated bearing 1 | INTRODUCTION As an important part of ship propulsion, the marine propeller shaft system provides the needed power for the ship. Because the stern tube bearing connects the propeller shaft, it is crucial to the safety and reliability of the whole mechanism. 1-3 Since the emergence of the oil resource crisis in the 1970s and the awareness of green environmental protection in recent years, water-lubricated bearings have attracted a lot of research attention. Water-lubricated bearings, using water as the lubricant and working medium, can prevent the pollution of the marine environment caused by lubricant oil leakages from traditional bearings. 4 However, water-lubricated bearings often experience severe friction and wear under extreme conditions such as starting, stopping, operating at low speed, and under heavy load, which greatly reduce the service life of the bearing. This is because it is difficult for the water-lubricated bearing friction pair to form a stable water film in boundary lubrication or even drive the bearing into the dry friction state. 5,6 Therefore, enhancing the lubrication performance of the stern bearing, especially its self-lubricating performance under boundary lubrication and dry friction, is of great significance for improving the efficiency, safety performance, and service life.

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Section: Resultsmentioning

confidence: 91%

Section: Effect Of Loadingmentioning

confidence: 91%

Development of modified polyacrylonitrile fibers for improving tribological performance characteristics of thermoplastic polyurethane material in water‐lubricated sliding bearings

Liang

Guo

Tian

et al. 2020

Polymers for Advanced Techs

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“…Furthermore, the addition of a strengthening phase into composites is an effective method to enhance their wear resistance properties, and many studies have been conducted to prove this [25,35,36]. Among these strengthening phases, graphite has been widely applied due to its low cost, excellent selflubricating performance, and can form carbides in situ during sintering [32,37]. In our previous work, a Ni-alloy matrix composite containing Ag+CaF2/ BaF2+graphite was designed and exhibits good frictional behavior over a broad temperature range from 25 to 800 °C in air [32].…”

Section: Introductionmentioning

confidence: 99%

Investigation of tribological characteristics of nickel alloy-based solid-lubricating composites at elevated temperatures under vacuum

et al. 2020

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The development of a high-performance solid-lubricating composite with excellent self-lubricity over a broad temperature range in vacuum is significant to solve the frictional problems of spatial mechanisms. In this study, the vacuum tribological behaviors of nickel-matrix/Ag/(Ca, Ba)F 2 /graphite (0-2 wt%) composites were studied from 25 to 800 ˚C. The results show that the synergistic effects of solid lubricants can significantly improve the tribological properties of the composites in vacuum, with the graphite content contributing considerably. For 2 wt% graphite, a low friction coefficient (0.14-0.25) and the lowest wear rate ((0.12-4.78)×10  5 mm 3 •N 1 •m  1 ) were observed in vacuum over the entire testing temperature range. Moreover, the wear mechanisms were clarified via analysis of the chemical composition and morphologies of the sliding surfaces.

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“…[2][3][4] Besides, as is known to us, water-lubricated bearings can effectively reduce wear, vibration, noise, improve reliability and extend the service life of drive shafts, which make it widely employed in ship propulsion systems to meet the environmental sustainability requirements. [5] Yin et al [6] studied the tribological behaviors of PEEK/Si3N4 tribopair under dry friction, pure water, and seawater lubrication to discuss the influence of lubricating medium on tribological characteristics. However, as a lubricant, water is less viscous than oil so that the loadcarrying capability of water film is quite low.…”

Section: Introductionmentioning

confidence: 99%

Investigating the water lubrication characteristics of sisal fiber reinforced ultrahigh‐molecular‐weight polyethylene material

2020

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The ultrahigh-molecular-weight polyethylene (UHMWPE) has become the most widely used material for water-lubricated bearings. In the research, the effects of introducing sisal fiber (SF) filler materials on the friction and wear characteristics of UHMWPE-based composites were investigated. The composites were tested against the QSn7-0.2 copper disc, under water-lubricated conditions, using a specially designed testing apparatus. The purpose was to identify an improved material which could be used in water-lubricated bearings. Four types of composites were tested under different sliding velocities and applied loads, which included pure UHMWPE and 10, 20, and 30 wt% SF reinforced UHMWPE. The friction coefficient and wear amount were measured to characterize the tribological properties of these composite materials. Moreover, in order to reveal the primary mechanism involved in friction and wear, various surface characterization techniques were adopted on the surface of composite materials. The analysis results showed that the addition of SF can stabilize the frictional properties and increase the water absorption of SF/UHMWPE composites. Furthermore, the use of a proper percentage of SF can discharge the wear debris, improve the loading capacity, and reduce adhesion wear. The adding of 10% SF in UHMWPE had produced the best anti-friction properties at low speed and heavy load. This work can serve as a reference for the design of hydrophilic fiber reinforced polymer composites to reduce wear and improve lubrication performance.

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Tribological behavior of various ceramic materials sliding against CF/PTFE/graphite-filled PEEK under seawater lubrication

Cited by 15 publications

References 31 publications

Development of modified polyacrylonitrile fibers for improving tribological performance characteristics of thermoplastic polyurethane material in water‐lubricated sliding bearings

Development of modified polyacrylonitrile fibers for improving tribological performance characteristics of thermoplastic polyurethane material in water‐lubricated sliding bearings

Investigation of tribological characteristics of nickel alloy-based solid-lubricating composites at elevated temperatures under vacuum

Investigating the water lubrication characteristics of sisal fiber reinforced ultrahigh‐molecular‐weight polyethylene material

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