The Effects of Ion Implantation on the Tribology of Perfluoropolyether-Lubricated 440C Stainless Steel Couples

Shogrin, Bradley A.; Wilbur, P. J.; Jones, William; Herrera-Fierro, P.; Williamson, D. L.

doi:10.1080/10402009608983561

Cited by 5 publications

(4 citation statements)

References 29 publications

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“…Based on the results and analyses, it can be concluded that plasma nitriding could aggravate the degradation of the PFPE grease and its lubrication effect during the sliding in vacuum. The similar result is conformed to what was reported in literature [14], showing that ion implantation of 440C steel disks with nitrogen was no effective in enhancing PFPE lubricant lifetime. For the fact that unreacted PFPE grease (as mentioned above) still exists on the worn surfaces of the nitrided disks, the lubrication film between two contact surfaces is composed of two components: the unreacted grease and various tribochemical products, implying that the lubrication effect could be remained partially.…”

Section: Friction and Wear Behavioursupporting

confidence: 95%

“…Jones et al [13] have pointed out that the PFPE greases can only be safely used with materials reducing degradation, such as TiC. Other work showed [14] that, the lifetime of the 440C couple lubricated by thin PFPE film was increased by an order of magnitude by implanting with Ti in a dry nitrogen atmosphere. Unfortunately, there was little detailed study of the degradation mechanism of the thin PFPE film during sliding wear.…”

Section: Introductionmentioning

confidence: 96%

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The Effect of Plasma Nitriding on the Tribology of Perfluoropolyether Grease-Lubricated 2Cr13 Steel Couples in Vacuum

Yang

Liu

et al. 2010

Tribol Lett

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A 2Cr13 steel was modified by plasma nitriding. The microstructure, phase composition and microhardness of the nitrided samples were examined. The friction and wear behaviour of the nitrided and unnitrided samples sliding against self-mating under PFPE grease-lubricated conditions in vacuum was investigated on a pin-on-disk type tribometer, with the interactions among the nitrided layer and grease to be focused on. The morphologies of the worn surfaces were observed using a scanning electron microscope. The chemical states of several typical elements on the worn surfaces were examined by means of X-ray photoelectron spectroscopy. The chemical compositions of grease samples taken from the worn surfaces were analyzed by Fourier transform infrared spectroscopy (FTIR). Results show that the nitrided steel has better friction-reducing and anti-wear abilities than the unnitrided one under PFPE grease-lubricated conditions. In the former case, the wear of nitrided steel shows a transition from mild abrasive wear to fatigue one with increasing normal load. In the latter case, wear mechanism of unnitrided steel under all load applied is a combination of the severe abrasion and fatigue.

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Section: Friction and Wear Behavioursupporting

confidence: 95%

Section: Introductionmentioning

confidence: 96%

The Effect of Plasma Nitriding on the Tribology of Perfluoropolyether Grease-Lubricated 2Cr13 Steel Couples in Vacuum

Yang

Liu

et al. 2010

Tribol Lett

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“…The permanent viscosity loss occurred rapidly with time and with increase in pressure beyond 1.95 GPa, which could be ascribed to decomposition of 815Z into (-OCF 2 O-) acetal group present in lubricant, at high pressure, adding to it, viscosity loss increases with change of phase from liquid to elastic-plastic solid phase. PFPE based oil containing hexafluropropane oxide fluid was tested in dry N 2 environment for its frictional and wear characteristics using Ti and TiC ion implanted discs (Shogrin et al) [37], it was reported that the lower life cycle is exhibited by the discs without any implantation and with TiC implantation, ascribed to the Lewis acid (Fe 3 F) formation. It was deduced from the x-ray spectroscopy and Conversion electron Mӧssbauer spectroscopy that the formation of ε-(Fe Cr) 2+x -N like phase formation acts as a passive layer, which helps in prolonging the lifecycle of the lubricant, when the Ti ion implanted disc is used as tribo-pair.…”

Section: Methods Used For Lubricationmentioning

confidence: 99%

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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“…Figure 7 shows the SEM morphology of the wear debris. According to a research (Shogrin et al, 1996), there are four kinds of particles generated by wear: microspall (micropit) particles, layer/thin particles (laminar particles), chunky particles, and spherical particles. Three sample groups all produce granular wear debris, which accumulate loosely.…”

Section: Experimental Methodsmentioning

confidence: 99%

Influence of Twin Carbide Structure on Friction and Wear Properties of G95Cr18 Stainless Bearing Steel

Guo

Lei

et al. 2019

Front. Mater.

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G95Cr18 stainless bearing steel is used to manufacture rolling bearings widely used in aviation and navigation fields. Twin carbide structure often appears in G95Cr18 stainless bearing steel structure and affects its material properties. This study adopts ball-block friction pairs to qualitatively discuss the influence of twin carbide structure of different degrees on the friction and wear performance of G95Cr18 stainless bearing steel under dry sliding conditions at room temperature and atmospheric environment. The results show that a slight twin carbide structure has only a little influence on the friction coefficient but can reduce the wear rate slightly, while a severe twin carbide structure can significantly increase the friction coefficient and wear rate. Thus, the existence of an optimal value for twin carbide structure was confirmed. The wear mechanism is mainly oxidation wear and abrasive wear, and the oxide produced by oxidation reaction during friction consists mainly of Fe 2 O 3 .

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The Effects of Ion Implantation on the Tribology of Perfluoropolyether-Lubricated 440C Stainless Steel Couples

Cited by 5 publications

References 29 publications

The Effect of Plasma Nitriding on the Tribology of Perfluoropolyether Grease-Lubricated 2Cr13 Steel Couples in Vacuum

The Effect of Plasma Nitriding on the Tribology of Perfluoropolyether Grease-Lubricated 2Cr13 Steel Couples in Vacuum

The state of art on lubrication methods in space environment

Influence of Twin Carbide Structure on Friction and Wear Properties of G95Cr18 Stainless Bearing Steel

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