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采用Raman光谱对三种不同碳纤维(K223HE、HTA40和T700SC)的微晶尺寸进行了表征,利用纳米压痕技术对三种碳纤维的横向弹性模量和硬度进行了测试,结合Weibull分布函数对碳纤维的横向弹性模量和硬度进行统计分析。结果表明,中间相沥青基碳纤维K223HE的微晶长度最大,为39.43nm±2.63nm,PAN基碳纤维HTA40和T700SC的微晶尺寸基本相同,分别为4.63nm±0.09nm和4.89nm±0.06nm。在纳米压痕载荷-深度曲线上,碳纤维K223HE的残余变形大(75.34nm±17.07nm),压入功恢复率低(65.89%)。碳纤维HTA40、K223HE和T700SC的特征横向弹性模量为19.52GPa、11.99GPa和17.92GPa。三种碳纤维的横向弹性模量的Weibull分布模数分别为25.26、6.85和8.07,说明HTA40碳纤维的性能均匀性最好。碳纤维的纳米压痕行为的差异主要是由碳纤维中微晶的完整性、择优取向性的差异引起的。
The crystallite sizes of three kinds of carbon fibers (K223HE, HTA40 and T700SC) were characterized by Raman spectroscopy. The transverse elastic modulus and hardness of three kinds of carbon fibers were tested by nanoindentation. The carbon fiber Transverse elastic modulus and hardness for statistical analysis. The results show that the crystallite length of mesophase pitch-based carbon fiber K223HE is the largest, which is 39.43 nm ± 2.63 nm. The crystallite sizes of PAN-based carbon fibers HTA40 and T700SC are basically the same, which are 4.63 nm ± 0.09 nm and 4.89 nm ± 0.06 nm, respectively. In the nano-indentation load-depth curve, the residual deformation of K223HE is large (75.34nm ± 17.07nm), and the recovery rate of the pressed work is low (65.89%). The characteristic transverse elastic moduli of the carbon fibers HTA40, K223HE and T700SC are 19.52 GPa, 11.99 GPa and 17.92 GPa. The Weibull distribution moduli of the transverse elastic moduli of the three carbon fibers are 25.26, 6.85 and 8.07, respectively, indicating that HTA40 carbon fiber has the best performance uniformity. The difference of nanoindentation behavior of carbon fiber is mainly caused by the difference of microcrystalline integrity and preferred orientation in carbon fiber.