摘要
本文主要研究了具有不同直径萘系中间相沥青纤维的氧化稳定化及炭化性质，结果表明，直径为１１μｍ和１６μｍ的细径中间相沥青纤维在空气中以０．５℃／ｍｉｎ的升温速度升至２６０℃和３２０℃，即可完全达到后续的炭化过程中完全不融化，且抗拉强度和模量分别达到最大值，而对于直径分别为２５μｍ和４７μｍ的沥青纤维，既使最终氧化温度很高，在炭化后的纤维中仍然形成所谓的“皮芯”结构，而且纤维越粗，“皮芯”结构中的芯部越大。炭纤维的抗拉强度及杨氏模量随沥青纤维的直径增大而减小，尽管在炭化过程中低的升温速度以及在炭化终温（１０００℃）长时间恒温，没有发现对最终炭纤维的断面结构及晶格参数有很大影响，但对炭纤维的力学性能有一定改善。
Abstract Oxidative stabilization and carbonization properties of mesophase pitch fibers with varions diameters prepared from naphthalene derived mesophase pitch were studied.Thinner pitch fibers with diameters of 11μm and 16μm,could be stabilized well in air with heating rate of 0.5℃/min upto 260℃ and 300℃,respectively;where their tensile strength and Young's modulus reached the highest values;while thicker fibers with diameters of 25μm and 47μm formed skin-core structures although the final stabilization temperatures were high enough,and the core of the latter was much larger.than the former.The tensile strength and Young's modulus decreased with the increasing of the pitch fiber diameter.Slow heating rate and long holding time at 1000℃ during carbonization were found to benefit the mechanical properties although there appeared no much differences among the transversal structures and crystal parameters of resultant carbon fibers.
出处
《炭素技术》
CAS
CSCD
1995年第6期14-20,共7页
Carbon Techniques
