Studies show that two dimensional(2D)nanomaterial and its hybrid have a great promise in tribology for the special laminar microstructure.However,the majority of performed investigations about 2D graphitic carbon nitride(g-C3N4)nanosheets are most focused on energy storage,catalysis,adsorption,rarely tribology.In the present study,g-C3N4 supporting mono-dispersed Ag nanoparticle hybrid(g-C3N4/Ag)is prepared,and its microstructure and chemical composition are determined.More specifically,the tribological performance as the lubricating additive of poly phthalazinone ether sulfone ketone(PPESK)composite is investigated using the ball-on-disc friction tester.Moreover,the corresponding enhancement mechanism is well proposed based on the experimental analysis and theoretical simulation.Obtained results show that Ag nanoparticles with a size of about 10-20 nm are homogeneously anchored on g-C3N4 nanosheets,favoring for good compatibility between g-C3N4/Ag and PPESK.It is found that when 0.3 wt％of g-C3N4/Ag is added to PPESK,the friction coefficient and wear rate of PPESK decrease by 68.9％and 97.1％,respectively.These reductions are mainly attributed to the synergistic self-lubricating effect of Ag nanoparticles and g-C3N4 nanosheet,the formation of transfer film,as well as the limited effect of g-C3N4/Ag on the shear deformation of PPESK composite film.Furthermore,it is found that the proposed g-C3N4/Ag-PPESK composite still keeps reasonable friction-reducing and wear-resistant properties under heavy loads and high rotating speeds.The present study demonstrates that the proposed g-C3N4/Ag hybrid is an excellent lubricating additive for polymer composites.

Beibei CHEN;Mengjie ZHANG;Kan ZHANG;Zhe DONG;Jiaye LI;Gai ZHAO

School of Materials and Science Engineering,Institute for Advanced Materials,Jiangsu University,Zhenjiang 212013,China;State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China

摩擦（英文）

[1]Beibei CHEN;Mengjie ZHANG;Kan ZHANG;Zhe DONG;Jiaye LI;Gai ZHAO-.Mono-dispersed Ag nanoparticles decorated graphitic carbon nitride:An excellent lubricating additive as PPESK composite film)[J].摩擦（英文）,2022(05):717-731

PPESK,phthalazinone

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