Cheng Yuwei, Yu Rui, Wang Tingting, Gao Xinlei
School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, China.
Hubei Institute of Aerospace Chemistry Technology, Xiangyang 441003, China.
Polymers (Basel). 2025 May 22;17(11):1439. doi: 10.3390/polym17111439.
Poly-ether-ether-ketone (PEEK) is widely used in dynamic sealing applications due to its excellent properties. However, its tribological performance as a sealing material still has limitations, as its relatively high friction coefficient may lead to increased wear of sealing components, affecting sealing effectiveness and service life. To optimize its lubrication performance, this study employs surface modification techniques to synthesize a thin polyimide (PI) film on the surface of PEEK. When paired with bearing steel, this modification reduces the friction coefficient and enhances the anti-wear performance of sealing components. The tribological properties of a friction pair composed of GCr15 steel and PI-modified PEEK were systematically investigated using a nematic liquid crystal as the lubricant. The friction system was analyzed through various tests. The experimental results show that, under identical conditions, the friction coefficient of the PI-modified PEEK system decreased by 83.3% compared to pure PEEK. Under loads of 5 N and 25 N and rotational speeds ranging from 50 rpm to 400 rpm, the system exhibited induced alignment superlubricity. At 50 rpm, superlubricity was maintained when the load was below 105 N, while at 200 rpm, this occurred when the load was below 125 N. Excessively high rotational speeds (above 300 rpm) might affect system stability. The friction coefficient initially decreased and then increased with increasing load. The friction system demonstrated induced alignment superlubricity under the tested conditions, suggesting the potential application of PI-modified PEEK in friction components.
聚醚醚酮（PEEK）因其优异的性能而广泛应用于动态密封领域。然而，作为密封材料，其摩擦学性能仍存在局限性，因为其相对较高的摩擦系数可能导致密封部件磨损加剧，影响密封效果和使用寿命。为了优化其润滑性能，本研究采用表面改性技术在PEEK表面合成了一层聚酰亚胺（PI）薄膜。当与轴承钢配对使用时，这种改性降低了摩擦系数，提高了密封部件的抗磨损性能。以向列型液晶为润滑剂，系统研究了GCr15钢与PI改性PEEK组成的摩擦副的摩擦学性能。通过各种试验对摩擦系统进行了分析。实验结果表明，在相同条件下,PI改性PEEK系统的摩擦系数比纯PEEK降低了83.3%。在5 N和25 N的载荷以及50 rpm至400 rpm的转速范围内，该系统表现出诱导取向超润滑性。在50 rpm时，当载荷低于105 N时保持超润滑性，而在200 rpm时，当载荷低于125 N时出现超润滑性。过高的转速（高于300 rpm）可能会影响系统稳定性。摩擦系数随载荷增加先减小后增大。在所测试的条件下，摩擦系统表现出诱导取向超润滑性，这表明PI改性PEEK在摩擦部件中具有潜在的应用价值。
