Abstract This paper focuses on developing a polyamic acid (PAA) of polyimide (PI) and PI filled with graphene (PI/GP) on 100CR6 ESU hardened steel. The tribological testing result of the pure PI and PI/GP against 100Cr6 steel ball at room temperature (RT) and elevated temperatures (50 °C, 100 °C, 150 °C, 200 °C) exhibits that the addition of GP clearly enhances the friction reduction and wear-resistant properties of PI, due to the excellent lubricating properties of GP. The 3 wt % of GP content in the PI is the optimum loading for the lowest friction and wear at RT and elevated temperatures. The SEM analysis of the worn surfaces showed that the high wear-resistant of the PI/GP composite is due to the generation of the loose particles from the coating surfaces which could be embedded on the friction pairs and rolled over there as a lubrication film. Also, at 60 % weight residue the PI/3 G P showed the high decomposition temperature.

中文翻译：

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高温下聚酰亚胺-石墨烯复合涂层的摩擦学性能

摘要 本文重点研究了在 100CR6 ESU 硬化钢上开发了一种由聚酰亚胺 (PI) 和 PI 填充石墨烯 (PI/GP) 组成的聚酰胺酸 (PAA)。纯 PI 和 PI/GP 与 100Cr6 钢球在室温 (RT) 和升高温度 (50 °C、100 °C、150 °C、200 °C) 下的摩擦学测试结果表明，GP 的添加明显增强由于GP优异的润滑性能，PI的减摩和耐磨性能。PI 中 3 wt% 的 GP 含量是在室温和高温下实现最低摩擦和磨损的最佳负载。磨损表面的 SEM 分析表明，PI/GP 复合材料的高耐磨性是由于涂层表面产生的松散颗粒可以嵌入摩擦副上并在那里滚动作为润滑膜。