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Lithium Citrate Triggered Macroscopic Superlubricity with Near-Zero Wear on an Amorphous Carbon Film by Shouyi Sun; Shuang Yi; Jinjin Li; Zhengmao Ding; Wei Song; Jianbin Luo is a Engineering article available to read on EtoBox.

What is Lithium Citrate Triggered Macroscopic Superlubricity with Near-Zero Wear on an Amorphous Carbon Film about?

An amorphous carbon (a-C) film shows substantial potential for friction and wear reduction. In this work, the robust superlubricity state with a coefficient of friction of 0.002 at the maximal pressure of 1.15 GPa was realized when lithium citrate (LC) was applied as the lubricating additive in ethylene glycol (EG) to lubricate the Si 3 N 4 /a-C friction pair based on the ball-onplate friction test. The wear rate of the a-C film was 4.5 × 10 −10 mm 3 /N•m, which was reduced by 98.3% compared to that of the film lubricated with EG. Friction promoted the chemisorption of the LC molecules via the tribochemical reaction between the carboxylate radicals and the a-C film. The exposed lithium ions could adsorb water molecules to form a hydration layer, providing extremely low shear strength. Furthermore, the colloidal silica layer formed on the Si 3 N 4 ball via the tribochemical reaction could reduce friction. It was difficult to destroy the formed tribochemical films under high contact pressure because they were robust, preventing the direct contact of the friction pair and resulting in the near-zero wear of the a-C film.

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Author

Shouyi Sun; Shuang Yi; Jinjin Li; Zhengmao Ding; Wei Song; Jianbin Luo

Publisher

American Chemical Society (ACS)

Published

2023

Language

EN

Field

Engineering (Physical Sciences)