Abstract

In this study, a series of thermoplastic polyimide (TPI) reinforced poly (ether ether ketone) (PEEK) blends with varied TPI content were prepared by a hot-pressing method. Friction and wear tests were conducted with a pin-on-disk contact configuration with an elevated temperature friction and wear tester. The morphologies of the worn surfaces were observed by scanning electron microscopy and a non-contact three-dimensional surface profiler. The crystalline structure, thermal properties, and mechanical properties were comparatively investigated. The results showed that the thermal endurance, friction-reducing capacity, and wear resistance were improved with the addition of TPI. It was found that the wear rate of the blends was dominated by the wear temperature rather than the wear tester contact pressure. The wear mechanism transferred from abrasive wear to adhesive wear when the environmental temperature exceeded the glass transition temperature. We suggest the 30% TPI/PEEK blends can be applied as a solid lubricant at elevated temperatures due to its optimum balance between compressive strength, thermal stability, and wear performance. The results could help to provide some experimental evidence for the broader application of various polymer blends affected by their wear resistance at elevated temperatures.

摘要

在这项研究中，通过热压方法制备了一系列具有不同TPI含量的热塑性聚酰亚胺（TPI）增强的聚（醚醚酮）（PEEK）共混物。摩擦和磨损测试是通过带有高温摩擦和磨损测试仪的销盘接触结构进行的。通过扫描电子显微镜和非接触式三维表面轮廓仪观察磨损表面的形貌。对晶体结构，热性能和机械性能进行了比较研究。结果表明，TPI的加入提高了耐热性，减摩能力和耐磨性。已经发现，共混物的磨损速率由磨损温度而不是磨损测试仪的接触压力决定。当环境温度超过玻璃化转变温度时，磨损机理从磨料磨损转移到胶粘剂磨损。我们建议将30％TPI / PEEK共混物用作高温下的固体润滑剂，因为它在抗压强度，热稳定性和耐磨性之间达到了最佳平衡。该结果可为在高温下受其耐磨性影响的各种聚合物共混物的更广泛应用提供一些实验证据。