PAN-CF的组织结构及力学性能

张力炭化可大大提高炭纤维的性能,在不同的温度下对聚丙烯腈基炭纤维进行张力炭化处理并进行高温石墨化,结果表明:PAN-CF(聚丙烯晴基炭纤维)的拉伸强度和拉伸模量随张力炭化温度的升高而增大,石墨化后,拉伸强度减小而拉伸模量增大。提高CF的张力炭化温度,可大大改善CF石墨化后的性能。CF的微晶尺寸(L_c)随张力炭化温度的升高而增大。石墨化后,L_c增加,层面间距(d_(002))大大减小;对于CF,张力炭化温度越高,L_c越大,d_(002)越小,并且CF内部的炭颗粒排列得越紧密,孔洞、皮芯结构等缺陷较少,CF性能较好。

Investigation of microstructure and properties of PAN-CF

Tension carbonization can improve the properties of carbon fibers(CF). PAN-CF is tension carbonized at different temperatures and then graphitized. The results show that. The tensile strength and tensile modulus increase with the carbonization temperature increasing, but tensile strength decreased and tensile modulus increased briefly after graphitization. The properties of the graphitized CF can be greatly improved by raising the tension carbonizing temperatures. After graphitization, when the tension carbonization is high, the carbon fibers possess larger L_c and lower d_(002), and the grains arrange more closely so as to cause less skin-core structure and pores.