Abstract
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.
Highlights
Since the 18th century, fossil fuels, such as coal, oil, and natural gas, have been the main energy sources for the development of automotive technology and transportation
We focused on the effect of the filler type and content on the tribological characteristics of acrylonitrile-butadiene rubber (NBR)
An ex-situ wear test was conducted to investigate the change in wear characteristics before and after hydrogen exposure according to the type and content of the filler in NBR
Summary
Since the 18th century, fossil fuels, such as coal, oil, and natural gas, have been the main energy sources for the development of automotive technology and transportation. Despite the benefits of fossil fuels for technological development, environmental problems, such as global warming, have arisen. There has been growing concern about the energy crisis caused by the depletion of fossil fuels. Hydrogen has emerged as a promising alternative energy source to fossil fuels. Hydrogen fuel cell electric vehicles (FCEVs) are key elements of the hydrogen economy. Compared to internal combustion engine vehicles, FCEVs are eco-friendly vehicles that produce no pollutants, only generating water and heat in fuel cells. Highpressure containers made of metallic materials may have problems owing to the hydrogen embrittlement phenomenon [1,2,3]. Many studies on the degradation of mechanical properties (e.g., ductility loss, decrease in fracture toughness, fatigue strength, and fatigue crack growth) have been conducted [4,5,6,7]
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