Abstract
DLC coatings have been applied to many automotive parts. This is because they have excellent properties such as low friction, high hardness, high wear resistance and chemical stability. Recently, bioethanol fuel has been attracting attention as a carbon-neutral fuel. However, the wear characteristics of DLC coatings under high-temperature and high-pressure environments, such as automobile engine environments, have not yet been clarified. In this study, friction and wear tests were conducted on Si-containing DLC coatings in ethanol containing high-temperature, high-pressure water. After friction test, we performed elemental analysis by Auger electron spectroscopy and AFM nano-scratch testing of wear scar of DLC coatings. As a result, it was found that the Si content suppressed the wear of DLC as the ethanol concentration increased, that the wear increased due to the effect of water, and that the wear increased due to the removal of the soft layer formed on the wear scar surface.
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