纸基摩擦复合材料微/纳米碳颗粒涂层的构建及其性能研究OA

Micro/nano-sized carbon particles are prone to agglomeration,making it difficult to construct uniform and wear-resistant coatings on paper-based friction materials.To address this issue,graphene nanoplatelets(GNP),vapor-grown carbon fibers(VGCF),and carbon fi-ber powders(CF)were separately sprayed onto friction base paper using an air-spraying technique.Subsequently,paper-based friction com-posites were fabricated through resin impregnation,hot pressing,and curing processes.Their microstructure,shear strength,thermal diffu-sivity,and frictional performance were systematically investigated.The results indicated that when the carbon particle content was 2%,the dispersibility,stability,and fluidity of the GNP,VGCF,and CF dispersions were all optimal.Compared with the pristine friction base pa-per without carbon particles,the paper-based composites coated with GNP exhibited increases of 16.3%and 8.2%in in-plane and normal thermal diffusivity,respectively,along with a 50%reduction in wear rate.For VGCF-coated composites,the shear strength increased by 129.1%,while the oil absorption time increased significantly.For CF-coated composites,the dynamic friction coefficient under a braking pres-sure of 3.01 MPa increased by 6.3%,and the coefficient of variation decreased by 33.6%～52.0%.In addition,the ratio of average dynamic to static friction coefficients approached to 1,indicating simultaneous improvements in transmission efficiency and operational stability.