Rolling Bearing Performance and Film Formation Behavior of Four Multiply Alkylated Cyclopentane (MAC) Base Greases for Space Applications

Mawatari, Toshifumi; Harada, T.; Yano, Masayuki; Shiomi, Hiroshi; Obara, Shin’ya; Ohno, Nobuyoshi

doi:10.1080/10402004.2013.769287

Cited by 4 publications

(5 citation statements)

References 19 publications

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“…PTFE thickener performed almost same in vacuum and air, while the tribological performance and life was observed to decrease in vacuum condition as compared to atmospheric condition. In atmospheric condition oxide layer formation inhibited wear of the bearing, whereas in vacuum grease with PTFE thickener could form a residual film on roller track due to adhesion and deposition of PTFE thickener, as observed through interferograms [61]. Fan et al (2014) [62] conducted the study on two Ionic liquid-based greases: 1-hexyl-3-methylimadazolium tetrafluroborate (LB 106) and 1-hexyl-3-methylimadazolium bis-(triflouromethylsulfonyl amide) (LF 106), while PTFE was added to them as thickener and compared with multiple alkylated cyclopentane grease.…”

Section: Low Temperature Workabilitymentioning

confidence: 94%

“…Thus, nitriding of 2Cr13 steel than sliding it under PFPE grease is not a viable solution. The effect of different types of thickeners on tribological performance and fatigue life of MAC based grease were studied by Mawatari et al (2013), four thickeners: sodium soap, Li soap, urea and PTFE were taken and tested in air and vacuum. PTFE thickener performed almost same in vacuum and air, while the tribological performance and life was observed to decrease in vacuum condition as compared to atmospheric condition.…”

Section: Low Temperature Workabilitymentioning

confidence: 99%

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The state of art on lubrication methods in space environment

Nautiyal,

Singh,

Gautam

et al. 2024

Phys. Scr.

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Space tribology is a very big aspect of space exploration, despite of this fact, there is a dearth of coherent and concise literature available in the field of space tribology. It becomes difficult to understand the tribological behaviour of mating bodies under the extreme environmental circumstances in space due to their potential chemical and physical interactions. The radiation, vacuum, environmental conditions and temperature, are the factors which affects the friction and wear behaviour of mating surfaces and may alter the chemical structure of solid or liquid lubricant. The combination of tribo-physical and tribo-chemical interactions makes the tribological analysis very difficult to understand. The lack of understanding and ignorance might be the reason for not addressing this issue in the past. This review contains the qualitative and quantitative information on the tribological behaviour of different types of liquid lubricants, greases, soft and hard coatings, combined lubrication systems, testing equipment, composites, solid lubricants and alloys developed for space applications.

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Section: Low Temperature Workabilitymentioning

confidence: 94%

Section: Low Temperature Workabilitymentioning

confidence: 99%

The state of art on lubrication methods in space environment

Nautiyal,

Singh,

Gautam

et al. 2024

Phys. Scr.

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“…Lubricating greases, possessing a position intermediate between the liquid and solid lubricants due to its semisolid character, can stay in place preventing creeping and contaminating the other surface . Therefore, the lubricating greases, which could meet abovementioned requirements, would be a particularly desirable and attractive alternative to the application in aerospace industry …”

Section: Introductionmentioning

confidence: 99%

“…9 Therefore, the lubricating greases, which could meet abovementioned requirements, would be a particularly desirable and attractive alternative to the application in aerospace industry. 10,11 There exist harsh space conditions including ultrahigh vacuum, ultraviolet rays (UV), atomic oxygen (AO), protons (Pr) irradiation, and electrons (El) irradiation, which could affect lubricating performance of lubricant material used for the spacecraft. [12][13][14] Our previous work showed that various irradiations in simulated space environment could affect seriously the surface structure, the chemical composite, and the tribological properties of materials including the phenolphthalein poly (ether sulfone), polyimide (PI), polytetrafluoroethylene (PTFE), and their composites enforced with fibres or nano-oxides.…”

Section: Introductionmentioning

confidence: 99%

The effect of space irradiation on the lubricating performance of perfluoropolyether greases in simulated space environment

Wang

et al. 2017

Lubrication Science

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In this paper, 2 kinds of commercial perfluoropolyether (PFPE) greases were coated on the polyimide (PI) blocks, which were placed within simulated space environment including atomic oxygen (AO), proton (Pr), ultraviolet (UV), and electron (El) irradiations, and then the tribological performance has been investigated with a ball‐on‐disc tribometer. Results indicated that the MoS2‐grease showed better lubrication performance than the PTFE‐grease. The changes in infrared spectroscopy induced by Pr and El irradiations were more obvious than that by AO and UV irradiations. Results of energy dispersive X‐ray spectroscopy indicated that Pr and El irradiations caused carbonation of greases, and AO and UV irradiations induced oxidation of greases. Referred to the tribological properties of PI coated with PFPE oil, PI coated with PFPE greases showed minor changes in friction coefficient and wear rate, and the MoS2 additives could significantly improve the lubrication properties of PFPE greases in simulated space environment.

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“…The paper of Pinel et al [1][2][3] studied the bearing temperature and power loss with the increase of the amount of oil, with increasing the amount of oil bearing, low temperature rise, but at the same time, the greater the friction stir oil, it should choose the proper amount of lubricating oil. Li Bin [4][5][6] has experimentally investigated the characteristics of two phase flow and heat transfer in the bearing cavity by experiments and simulations. As early as the 60s of the last century, the idea of heat transfer was applied to calculate the temperature of rolling bearings by Harris and Burton [7].…”

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confidence: 99%

Study on Two Phase Flow Heat Transfer of High Speed Bearings by Injection Lubrication

Li¹,

Zeng²,

Huang³

2017

dtetr

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Abstract. In this paper, the study of Numerical analysis of bearing lubrication flow field is presented. Through the experiment, due to the centrifugal force, the liquid diffusion of a uniform surface. when v=1094mm/s, the whole surface has smaller accumulation of fluid film thickness of thicker body, this condition is not conducive to the ball body heat, proper ball rolling speed can in the fluid diffusion into the surface of the ball. Without contact with the stationary samples, the fluid diffusion area. And when the rolling ball contact with the stationary sample, the liquid will be together, the radius is smaller, the fluid gathered more concentrated, which is not conducive to the rolling lubrication and cooling. PrefaceRolling bearing is a kind of mechanical component widely used in mechanical transmission. High speed ball bearing under the working state, the rolling, the guide plane of the retainer ring and the contact friction loss and bearing internal flow field of fluid viscous dissipation and other reasons will produce a large amount of heat, if the power loss of poor heat cannot be distributed, it will seriously affect the working performance of the bearing. The paper of Pinel et al [1][2][3] studied the bearing temperature and power loss with the increase of the amount of oil, with increasing the amount of oil bearing, low temperature rise, but at the same time, the greater the friction stir oil, it should choose the proper amount of lubricating oil. Li Bin [4][5][6] has experimentally investigated the characteristics of two phase flow and heat transfer in the bearing cavity by experiments and simulations. As early as the 60s of the last century, the idea of heat transfer was applied to calculate the temperature of rolling bearings by Harris and Burton [7]. In 1980, Kleckner [8] put forward a large-scale analysis software CYBEANO for cylindrical roller bearings.

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Rolling Bearing Performance and Film Formation Behavior of Four Multiply Alkylated Cyclopentane (MAC) Base Greases for Space Applications

Cited by 4 publications

References 19 publications

The state of art on lubrication methods in space environment

The state of art on lubrication methods in space environment

The effect of space irradiation on the lubricating performance of perfluoropolyether greases in simulated space environment

Study on Two Phase Flow Heat Transfer of High Speed Bearings by Injection Lubrication

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