Micron-sized graphene sheets have been introduced as additives to enhance the lubricating capabilities of water. The tribological characteristics of the lubricants after preparation and storage for 6 months were systematically analyzed. Results indicated that the friction coefficient and wear volume of the tribo-pair were reduced through the incorporation of a certain concentration of graphene sheets, and also have long-term storage stability. Notably, under the experimental conditions, a 0.2 % mass concentration of graphene in the aqueous lubricant exhibited exceptional tribological performance and long-term storage stability effect, achieving an 80 % reduction in friction coefficient and a 78 % decrease in wear volume with a 14,000‐cycle friction test. Wear morphology analysis indicated that after adding graphene sheets to the aqueous solution, micro-plastic deformation occurs on the worn surface of the steel plate. The wear profile of the GCr15 counter ball changes from a circular profile to a rectangular-like profile. The main reason is that the graphene sheets in the aqueous solution can enter the contact interface during the friction process, hindering direct contact between the friction pair. The study provides a simple method to improve the tribological properties of aqueous solutions stably for engineering applications.
Zhang et al. (Thu,) studied this question.
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