The mechanical and tribological properties of polyimide (PI)‐based composites loaded with polytetrafluoroethylene (PTFE) and milled carbon fibers (MCF) in the as received and annealed states were studied in order to increase adhesion to the polymer matrix. It has been shown that loading with micron‐range MCF (200 μm) doubles elastic modulus of the composites while all other physical and mechanical properties remain at neat PI levels. The three‐component composite loaded with annealed MCF and PTFE has possessed the highest wear resistance. In comparison with neat PI, its wear rate has decreased by ∼312 times for the metal‐polymer tribological contact and by ∼286 times for the ceramic‐polymer one. Based on the obtained experimental data, the most preferential conditions for their implementation (load‐speed modes for the given types of the tribological contacts) have been determined using a developed computer algorithm. The designed solid‐lubricant ''PI + 10 wt% PTFE + 10 wt% MCF_annealed'' composite has been recommended for both metal‐polymer and ceramic‐polymer tribological units.

中文翻译：

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磨细的碳纤维退火对固体润滑热塑性聚酰亚胺基复合材料的机械和摩擦学性能的影响

研究了以聚四氟乙烯（PTFE）和磨碎的碳纤维（MCF）负载的聚酰亚胺（PI）基复合材料在接收和退火状态下的力学和摩擦性能，以提高其对聚合物基体的附着力。研究表明，使用微米级MCF（200μm）加载可使复合材料的弹性模量翻倍，而所有其他物理和机械性能均保持在纯PI水平。加载了MCF和PTFE退火的三组分复合材料具有最高的耐磨性。与纯净PI相比，金属-聚合物摩擦接触的磨损率降低了约312倍，陶瓷-聚合物摩擦磨损率降低了286倍。根据获得的实验数据，使用开发的计算机算法已经确定了最优先执行这些条件的条件（给定类型的摩擦接触的负载速度模式）。设计的固体润滑剂'PI + 10 wt％PTFE + 10 wt％MCF已建议对金属-聚合物和陶瓷-聚合物摩擦学单元均采用_退火''复合材料。