不同纤维成形结构的碳纤维预制体对湿式摩擦材料性能的影响研究OA

To optimize the structural design and regulate tribological properties of carbon fiber friction materials,three types of polyacryloni-trile(PAN)-based carbon fiber preforms including raw carbon paper,carbon felt,and carbon cloth were impregnated with phenolic resin solu-tion.Carbon fiber friction materials were subsequently manufactured via hot pressing and curing.The influences of different preform struc-tures on surface micromorphology,pore structure,hardness,shear strength,compression resilience,friction,and wear performance of the materials were investigated.The results revealed that compared with carbon cloth-based samples,the carbon fiber friction materials pre-pared from raw carbon paper and carbon felt showed porosity increased by 386.2%and 338.3%,hardness declined by 34.0%and 30.1%,compressibility increased by 60.0%and 24.1%,resilience rate declined by 5.6%and 4.6%,and permanent deformation rate increased by 151.7%and 101.7%,respectively,both accompanied by a remarkable reduction in shear strength.After friction and wear tests,raw carbon paper and carbon felt-based fiber friction materials achieved superior friction performance.Their midpoint friction coefficients were 0.116～0.141 and 0.105～0.131,end-to-midpoint friction coefficient ratios were 0.952～1.081 and 1.082～1.173,and wear rates were 2.16×10-6 and 1.46×10-6 cm3/J,correspondingly.By contrast,carbon cloth-based fiber friction material possessed a midpoint friction coefficient of 0.094～0.118,an end-to-midpoint friction coefficient ratio of 0.987～1.115,and a wear rate of 1.18×10-6 cm3/J,which exhibited outstanding bonding stability and long-term wear resistance.