原文：1683081162b31526.pdf

  润滑剂在减少机械系统的磨损方面起着至关重要的作用。碳纳米材料添加剂，如石墨烯，已被发现在用作润滑剂添加剂时可显著提高摩擦学性能。在这里，消费后的塑料和冶金焦炭通过闪蒸焦耳加热（FJH）转化为涡轮层闪蒸石墨烯（FG）。然后将FG加入到聚（α-烯烃）6或9（PAO 6或PAO 9）中。在四球测试过程中，将废塑料衍生FG（WPFG）和冶金焦炭衍生FG（MCFG）添加到润滑剂中会显著降低摩擦系数（CoF）、磨痕直径（WSD）和粗糙度。在0.1 mg/mL时，WPFG和MCFG分别使PAO 9中的CoF降低6%和9%，在0.5 mg/mL时，PAO 6中的CoF分别降低23%和6%。WPFG和MCFG通过在金属表面之间形成涂层状层，使PAO 9中的钢球在0.5 mg/mL时的WSD分别降低14%和8%，在PAO 6中在0.5 mg/mL时分别降低12%和14%。在PAO 6中，WPFG和MCFG的粗糙度分别降低了38%和32%，在PAO 9中，WPFG和MCFG分别降低了35%和29%。最后，初步的生命周期分析表明，与石墨烯的传统生产技术相比，FG的生产产生的温室气体排放量减少了99%，所需能源减少了98%，耗水量减少了99.9%。因此，冶金焦炭和废塑料被证明是高质量闪蒸石墨烯润滑剂添加剂的现成原料。

    Lubricants play an essential role in reducing wear in mechanical systems. Carbon nanomaterial additives, such as graphene, have been found to significantly improve tribological performance when used as lubricant additives. Here, post-consumer plastic and metallurgical coke are converted into turbostratic flash graphene (FG) through flash Joule heating (FJH). The FG is then added to either poly(alpha olefin) 6 or 9 (PAO 6 or PAO 9). Adding waste plastic-derived FG (WPFG) and metallurgical coke-derived FG (MCFG) to lubricants resulted in a significant decrease in the coefficient of friction (CoF), wear scar diameter (WSD), and roughness during four-ball testing. WPFG and MCFG decrease the CoF in PAO 9 by 6% and 9% at 0.1 mg mL−1, respectively, and in PAO 6 by 23% and 6% at 0.5 mg mL−1, respectively. WPFG and MCFG decrease the WSD of steel balls in PAO 9 by 14% and 8% at 0.5 mg mL−1, respectively, and in PAO 6 by 12% and 14% at 0.5 mg mL−1, respectively, by forming a coating-like layer between the metal surfaces. Roughness decreased by 38% and 32% for WPFG and MCFG in PAO 6, respectively, and by 35% and 29% for WPFG and MCFG in PAO 9, respectively. Finally, preliminary life cycle analyses demonstrate that production of FG produces up to 99% less greenhouse gas emissions, requires 98% less energy, and consumes 99.9% less water when compared to conventional production techniques of graphene. Hence, metallurgical coke and waste plastic are shown to be ready feedstocks for high-quality FG lubricant additives.