## 4 Conclusions and Future Works  
This research introduces an innovative low-friction composite based on PEEK, which includes PPTA, and PTFE to enhance its tribological performance through identifying the ideal temperature and pressure settings for fabricating PEEK through compression molding methods. We evaluated the impact of different levels of PTFE and PPTA additives on the performance of PEEK under both dry friction and oil lubrication conditions. Ultimately, we developed a PPTA/PTFE/PEEK composite with favorable wear resistance characteristics and a low coefficient of friction. The insights drawn from our research can be summarized as follows:  
1. We observed that sintering temperatures and forming pressures affect the mechanical properties of PEEK. Notably, PEEK produced under molding conditions of 380 \({}^{\circ}\)C and 9 MPa demonstrated the lowest coefficient of friction as well as exceptional wear resistance, setting a benchmark for its mechanical and tribological excellence.
2. The ability of PPTA to retain high mechanical strength at high temperatures is critical in minimizing adhesive wear during dry sliding. In addition, the tensile strength of PPTA enhances the PEEK composite's anti-wear capabilities under oil lubrication, with the 94 wt% PEEK/6 wt% PPTA blend demonstrating the most optimal wear resistance, the wear depth being 44.1% less compared to the standard pure PEEK sample.
3. The introduction of PTFE forms a lubricating film under pressure, which not only lowers the COF but also offers robust resistance against wear. The 75 wt% PEEK/25 wt% PTFE composite outperformed all, indicating a COF reduction of 57.9% under dry friction and 50.3% under oil lubrication conditions relative to the pure PEEK sample.
4. Incorporating both PPTA and PTFE into PEEK can lead to significantly enhanced overall anti-friction and anti-wear capabilities of the composites, often exceeding the performance improvements achievable with the individual inclusion of either PPTA or PTFE. The reason is that the addition of PPTA and PTFE could not only maintain the original strength of PEEK, but also utilize the advantages of PPTA and PTFE to improve tribological properties. Compared to the PEEK samples, the 69 wt% PEEK/6 wt% PPTA/25 wt% PTFE composite, in particular, showed a 51.6% decrease  
Figure 13: SEM micrographs show wear marks under oil lubrication conditions: (**A**) PEEK, (**B**) PT25 PP6, (**C**) PP2, (**D**) PP6, (**E**) PT5, (**F**) PT25.  
in the coefficient of friction and a 93.5% reduction in the wear depth during dry friction as well as a 42.2% decrease in the coefficient of friction and a 39.8% reduction in the wear depth under oil lubrication conditions compared to pure PEEK samples.  
In this research, the result is only the relatively optimal sample in the test conditions. Therefore, if you want to use the most suitable PEEK matrix composite material in practical industrial applications, it is necessary to further refine its optimal forming conditions and optimal formula with the help of theoretical calculations or a large number of tests.  
[PERSON] and [PERSON] proposed the research and designed the experiments. [PERSON] conducted the experiments and wrote the draft manuscript. [PERSON], [PERSON], [PERSON] and [PERSON] provided the experimental equipment. [PERSON] revised the manuscript and supervised the work. All authors have read and agreed to the published version of the manuscript.  
This research received no external funding.  
Not applicable.  
The raw data supporting the conclusions of this article will be made available by the authors on request.  
Thanks to Dalian Maritime University.  
The authors declare no conflict of interest.