CeO₂ nanoparticles prepared by the in-situ synthesis method were used to strengthen the polyamide-imide/polytetrafluoroethylene(PAI/PTFE) lubricating coatings. The crystalline phases and micro-structure of the lubricating coatings were characterized by XRD and SEM. A CSM friction machine was used to test the tribological properties of the coatings. The experimental results showed that CeO₂ nanoparticles synthesized in-situ in
the PAI/PTFE coatings had good dispersion and a narrow range of particle size (about 80 nm–110nm). The addition of CeO₂ nanoparticles could effectively promote the micro-hardness and anti-wear performance of the
coatings. Furthermore, the PAI/PTFE lubricating coating filled with 5 wt% CeO₂ nanoparticles exhibited superior micro-hardness and wear resistance. In practical applications, The PAI/PTFE lubricating coating filled with 5 wt% CeO₂ nanoparticles is more suitable for high max sliding velocity and low applied load.