The development of high-performance polytetrafluoroethylene(PTFE)composites with excellent wear resistance and selflubrication under heavy-load and high-speed conditions is urgently needed for advanced tribological ap...The development of high-performance polytetrafluoroethylene(PTFE)composites with excellent wear resistance and selflubrication under heavy-load and high-speed conditions is urgently needed for advanced tribological applications in many fields,including aviation and aerospace,but this development remains a challenge.Human enamel,a natural composite capable of enduring millions of chewing cycles under pressures up to~2.5 GPa,serves as an ideal model for advanced wear-resistant composites.Herein,a biomimetic design strategy inspired by the antiwear effect of the enamel rod/interrod structure is proposed to create PTFE composites with a cell-structured ceramic scaffold reinforcement microstructure.By utilizing the preferential load support effect and debris size control mechanism of ceramic scaffolds,bioinspired composites achieve excellent wear resistance with effective self-lubrication.Furthermore,a polydopamine(PDA)modification technology for PTFE components is employed to increase the adhesion and stability of PTFE transfer films,thereby improving the self-lubrication performance of the composites.Consequently,the resulting composites exhibit outstanding tribological properties,especially those characterized by near-zero wear and good self-lubricity under heavy loads and high speeds.This work will advance the development of high-performance self-lubricating composites suitable for extreme conditions.Furthermore,the proposed design strategy is expected to be applicable to other biological prototypes,enabling the creation of diverse high-performance functional composites.展开更多
基金supported by the National Natural Science Foundation of China(Nos.52075459 and 52305217)the Fundamental Research Funds for the Central Universities(No.2682024CX084)。
文摘The development of high-performance polytetrafluoroethylene(PTFE)composites with excellent wear resistance and selflubrication under heavy-load and high-speed conditions is urgently needed for advanced tribological applications in many fields,including aviation and aerospace,but this development remains a challenge.Human enamel,a natural composite capable of enduring millions of chewing cycles under pressures up to~2.5 GPa,serves as an ideal model for advanced wear-resistant composites.Herein,a biomimetic design strategy inspired by the antiwear effect of the enamel rod/interrod structure is proposed to create PTFE composites with a cell-structured ceramic scaffold reinforcement microstructure.By utilizing the preferential load support effect and debris size control mechanism of ceramic scaffolds,bioinspired composites achieve excellent wear resistance with effective self-lubrication.Furthermore,a polydopamine(PDA)modification technology for PTFE components is employed to increase the adhesion and stability of PTFE transfer films,thereby improving the self-lubrication performance of the composites.Consequently,the resulting composites exhibit outstanding tribological properties,especially those characterized by near-zero wear and good self-lubricity under heavy loads and high speeds.This work will advance the development of high-performance self-lubricating composites suitable for extreme conditions.Furthermore,the proposed design strategy is expected to be applicable to other biological prototypes,enabling the creation of diverse high-performance functional composites.
