Friction and wear behaviour of polymers in liquid hydrogen

Theiler, Géraldine; Gradt, Thomas

doi:10.1016/j.cryogenics.2018.05.002

Cited by 24 publications

(18 citation statements)

References 12 publications

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“…They used the improved Arrhenius equation to give a theoretical model of the friction coefficient changing with the temperature. Theiler and Gradt [12] found that the friction and wear mechanism of PIs under low-temperature conditions with gaseous and liquid hydrogen was related to the † Mingkun XU and Zidan WANG contributed equally to this work. chemical structure and the formation or inhibition of the transfer films.…”

Section: Introductionmentioning

confidence: 99%

Tribological properties of PTFE-based fabric composites at cryogenic temperature

Wang

Guo

et al. 2023

Friction

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Fabric composites are widely employed in self-lubricating bearing liners as solid lubrication materials. Although the tribological behaviors of fabric composites have been extensively studied, the cryogenic tribological properties and mechanisms have been scarcely reported and are largely unclear to instruct material design for aerospace and other high-tech applications. Herein, the tribological properties of polytetrafluoroethylene (PTFE)-based hybrid-fabric composites were investigated at cryogenic and ambient temperatures in the form of pin-on-disk friction under heavy loads. The results suggest that the friction coefficients of the hybrid-fabric composites obviously increase with a decrease in wear when the temperature drops from 25 to −150 °C. Moreover, thermoplastic polyetherimide (PEI), as an adhesive for fabric composites, has better cryogenic lubrication performance than thermosetting phenol formaldehyde (PF) resin, which can be attributed to the flexible chemical structure of PEI. The excellent lubrication performance of hybrid-fabric composites is attributed to the transfer film formed by PTFE fibers on the surface of fabrics.

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Section: Introductionmentioning

confidence: 99%

Tribological properties of PTFE-based fabric composites at cryogenic temperature

Wang

Guo

et al. 2023

Friction

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“…Therefore, it is necessary to evaluate the tribological characteristics of polymer materials in a hydrogen environment. A few reports exist on the tribological characteristics of polymer composites in hydrogen environments [ 17 , 18 , 19 , 20 ]. These studies contribute to the understanding of the tribological characteristics of polymers under hydrogen gas.…”

Section: Introductionmentioning

confidence: 99%

Effect of Functional Fillers on Tribological Characteristics of Acrylonitrile Butadiene Rubber after High-Pressure Hydrogen Exposures

et al. 2022

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In a high-pressure hydrogen environment, the sealing rubber material is swelled by hydrogen, and the mechanical and tribological properties are reduced, causing various problems in the sealing performance. The focus of this study was the effect of the filler type and content on the tribological characteristics of rubber after exposure to high-pressure hydrogen. Acrylonitrile butadiene rubber specimens were exposed to high-pressure hydrogen at 96.6 MPa, and the change in the amount of wear with time after exposure was observed. The wear test was performed using a pin-on-disc ball tip to measure the amount of wear before and after hydrogen exposure of the materials under fixed revolutions per minute and normal load. Scanning electron microscopy was used to observe the wear track and cross section of the specimen to examine the changes in the wear mechanism after hydrogen exposure and to analyze the wear mechanism for each filler. The results of this study are expected to contribute to the evaluation of the tribological properties of the sealing materials used in hydrogen environments.

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“…Although most hydrogen vehicles store hydrogen in gaseous form in their tanks such as the Ford Zetec 2.0 L and Toyota Mirai FCV [7][8], some examples such as the first GM FCV Electro Van (1966), GM HydroGen3, BMW Mini Hydrogen, and BMW 750hl [9][10][11] use liquid hydrogen as a fuel that is stored in cryogenic tanks in a vacuum environment [12][13]. Liquefaction of hydrogen is one of the best ways to store hydrogen [14], so LH2 is a promising part of hydrogen applications [15]. The gasification of LH2 in these applications results in waste energy which can be used for cooling purposes with some auxiliary equipment such as pressure regulator, evaporator, and air fan.…”

Section: Introductionmentioning

confidence: 99%

An emission reduction method in liquid hydrogen powered fuel cell vehicles

Uğurlu

2022

International Journal of Automotive Engineering and Technologies

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An emission reduction method has been analyzed for Liquid Hydrogen (LH2) powered Fuel Cell Vehicles (FCVs) using GREET software in this study. In the analysis, cooling rates and Coefficient of Performance (COP) values of the proposed system have been calculated for FCVs that considered. Average reductions of the years 2010, 2020, 2030, 2040, and 2050 in emissions for the use of Auxiliary Air Condition (AAC) system in the FCVs are analyzed in g/year for Volatile Organic Compounds (VOC), Carbon Monoxide (CO), Nitrogen Oxides (NOx), Particulate Matters (PM10 & PM2.5), and Sulfur Oxides (SOx). Average reduction in Carbon Dioxide (CO2) emission is calculated and given in kg/year. All the emissions decrease in significant proportions due to the reduction in fuel consumption by less usage of the main AC system of the vehicles.

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Friction and wear behaviour of polymers in liquid hydrogen

Cited by 24 publications

References 12 publications

Tribological properties of PTFE-based fabric composites at cryogenic temperature

Tribological properties of PTFE-based fabric composites at cryogenic temperature

Effect of Functional Fillers on Tribological Characteristics of Acrylonitrile Butadiene Rubber after High-Pressure Hydrogen Exposures

An emission reduction method in liquid hydrogen powered fuel cell vehicles

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