Effect of gamma radiation on graphite – PTFE dry lubrication system

Singh, Sachin; Tyagi, Mukti; Seshadri, Geetha; Tyagi, A. K.; Varshney, Lalit

doi:10.1016/j.radphyschem.2017.07.011

Cited by 11 publications

(4 citation statements)

References 17 publications

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“…Polytetrafluoroethylene (PTFE) has favorable properties like high chemical and biological tolerance, thermal stability, as well as its excellent dielectric, antifriction, and antiadhesive properties, polytetrafluoroethylene (PTFE) is a preferable material for the manufacture of articles in different industries and engineering [ 1 , 2 , 3 , 4 , 5 , 6 ]. For tribological applications, PTFE is also an expedient polymer material that is widely available.…”

Section: Introductionmentioning

confidence: 99%

Tribological and Mechanical Behavior of Graphite Composites of Polytetrafluoroethylene (PTFE) Irradiated by the Electron Beam

et al. 2020

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This research investigated the effect of irradiation with an electron beam energy of 10 MeV in doses of 26–156 kGy on polytetrafluoroethylene (PTFE) with a 15% and 20% graphite additive. The research has shown that mechanical (compression strength, hardness, and Young’s modulus) and sclerometric (coefficient of wear micromechanism and coefficient of resistance to wear) properties improve and tribological wear decreases as graphite content increases. Electron beam irradiation increases the degree of crystallinity of both materials to a similar extent. However significant differences in the improvement of all examined properties have been demonstrated for PTFE with higher (20%) graphite content subjected to the electron beam irradiation. This polymer is characterized by higher hardness and Young’s modulus, reduced susceptibility to permanent deformation, higher elasticity, compression strength, and above all, a nearly 30% reduction in tribological wear compared to PTFE with a 15% graphite additive. The most advantageous properties can be obtained for both of the examined composites after absorbing a dose of 104 kGy. The obtained results hold promise for the improvement of the operational life of friction couples which do not require lubrication, used for example in air compressors and engines, and for the possibility of application of these modified polymers. In particular PTFE with 20% graphite content, in the nuclear and space industry.

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Section: Introductionmentioning

confidence: 99%

Tribological and Mechanical Behavior of Graphite Composites of Polytetrafluoroethylene (PTFE) Irradiated by the Electron Beam

et al. 2020

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“…22 Bonds between the graphite layers are weak Van der Waals forces which allow the material to split easily between layers, giving graphite its desirable low friction property. 23 MoS 2 has perfect lubricity in clean and dry condition, but its lubricity substantially decreases with contaminations. On the other hand, the performance of graphite is even better in the presence of little humidity.…”

Section: Solid Lubricantsmentioning

confidence: 99%

“…22 Bonds between the graphite layers are weak Van der Waals forces which allow the material to split easily between layers, giving graphite its desirable low friction property. 23…”

Section: Solid Lubricantsmentioning

confidence: 99%

Application of solid lubricant for enhanced frictional efficiency of deep drawing process

Jivan

Eskandarzade

Bewsher

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Manufacturing processes are usually energy intensive, contributing to the global carbon dioxide emissions. Deep Drawing is one of the most common types of sheet metal forming processes with great potential for energy efficiency improvement. In this paper, the optimised combination of molybdenum disulphide (MoS2) and graphite is proposed as a solid lubricant to reduce the punching force and energy consumption of deep drawing process. Different mixtures of MoS2 and graphite are prepared and their tribological performance are measured using experimental tests on tribometer. In order to investigate the friction reduction rate in deep drawing process, finite element simulation of the drawing process is performed. Results show that friction reduction using proposed combination of lubricants has significant effect on punching force and would provide greater process efficiency.

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“…[5][6][7] According to component types of solid lubricant materials, they are divided into inorganic and organic solid lubricant materials which are readily combined with polymer. [8][9][10][11] Meanwhile, several polymer resins such as polytetrafluoroethylene (PTFE) [11][12][13][14] and polyurethane (PU) [15][16][17][18] have intrinsic lubrications. However, in practical applications, the tribological properties of polymer resins are needed to satisfy low friction coefficient (COF) and wear ratio at the same time.…”

Section: Introductionmentioning

confidence: 99%

A review of solid lubrication based on polyurethane composites

et al. 2023

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Solid lubricant materials could be used in various extreme conditions owing to the excellent anti‐friction and ‐wear with the low friction coefficient and wear rate. Polyurethane (PU)‐based solid lubricants as one of the widely utilized composite materials had been well‐known by researchers all over the world. PU‐based composite lubricants were commonly segmented into single‐phase lubricants and multi‐phase lubricants via inorganic or organic lubricant additives. What is more, the modified PU by solid lubricants would endow higher tribological performances than that of single‐phase PU‐based lubricants. Based on the multi‐component synergy, the multi‐phase lubricants could significantly improve the PU matrix's lubrication and wear resistance and enhance the comprehensive performance such as corrosion resistance. This paper mainly discussed and summarized the recent development in tribological performances of PU‐based composite lubricants, and explored their prospective research directions.

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Effect of gamma radiation on graphite – PTFE dry lubrication system

Cited by 11 publications

References 17 publications

Tribological and Mechanical Behavior of Graphite Composites of Polytetrafluoroethylene (PTFE) Irradiated by the Electron Beam

Tribological and Mechanical Behavior of Graphite Composites of Polytetrafluoroethylene (PTFE) Irradiated by the Electron Beam

Application of solid lubricant for enhanced frictional efficiency of deep drawing process

A review of solid lubrication based on polyurethane composites

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