Abstract
Additives that are optimized for diamond-like carbon (DLC) coatings are highly demanded as their applications have expanded recently. In this study, friction tests were conducted on a tetrahedral amorphous carbon (ta-C)/ta-C tribopair using a phosphonate additive with hydroxy groups, which comprises glycerol monooleate (an additive that reduces the friction of DLC) and zinc dialkyl dithiophosphate (an additive that reduces wear), and the obtained tribolayers were analyzed using AFM, XPS, and ToF–SIMS. We found that the phosphonate additive with hydroxy groups tribochemically reacted with the ta-C coating to form a low-shear, hard tribolayer on the surface, thereby reducing the friction and wear of the ta-C coating. Our results indicate that additives with phosphonate structures and hydroxy groups are effective for DLC coatings.
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KT: Investigation, Project administration, Resources, Mehodology, Writing—original draft. TT: Conceptualization, Methodology, Investigation, Project administration, Resources, Writing—review & editing. NU: Methodology, Writing—review & editing. MM: Methodology, Writing—review & editing. TO: Methodology, Writing—review & editing. KY: Methodology, Writing—review & editing.
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Tanaka, K., Tokoroyama, T., Umehara, N. et al. Effects of Phosphonate Additives with Hydroxy Groups on the Tribological Properties of ta-C Coatings Under Boundary Lubrication. Tribol Lett 71, 67 (2023). https://doi.org/10.1007/s11249-023-01734-3
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DOI: https://doi.org/10.1007/s11249-023-01734-3