碳纤维对酚醛树脂复合材料力学性能和耐久性能的影响OA

Carbon fiber(CF)modified by a coupling agent(KH-550)was employed as the reinforcement,and phenolic resin(PF)served as the matrix to fabricate PF/CF composites.The mechanical properties and durability of the composites were subsequently investigated.The results revealed that after CF was modified by KH-550,a new characteristic peak emerged at 990 cm-1 in the Fourier transform infrared spectrum of CF,while the peaks near 1 150 cm-1 and 3 485 cm-1 became broader and significantly intensified,indicating that KH-550 had been successfully grafted onto the CF surface.As the content of modified CF increased,both the tensile strength and flexural strength of the PF/CF composites exhibited a trend of initial increase followed by decrease.The friction resistance first improved and then deteriorated,whereas the heat resistance gradually enhanced.When the mass fraction of modified CF was 6%,the comprehensive mechanical properties and durability of PF/CF composites reached the optimum.Compared with PF,the tensile strength and flexural strength of the composites increased by 119.7%and 55.3%,respectively,the wear rate decreased by 75.6%,the initial thermal decomposition temperature rose by 64℃,and the final mass residual ratio was 2.02 times that of PF.