CAJ | 학술논문

采用场发射扫描电子显微镜、广角X射线衍射、元素分析、高分辨透射电子显微镜对东丽T700S、T700G和东邦UT500 3种碳纤维的表面和断面形貌、化学组成及石墨微晶等微观组织结构进行了表征,比较了这3种碳纤维的微观结构差异,并分析了这些差异对力学性能的影响。结果表明,T700G碳元素含量较高,氮元素含量较低,它的石墨微晶尺寸较大,取向度较高,这是它比T700S拉伸模量高但断裂伸长率低的原因;UT500的表面结构与断面结构不如T700S和T700G好,微晶尺寸也较小,但它的直径略细,而且石墨微晶内（002）晶面排列比T700S和T700G更规整,导致UT500的综合力学性能略优于T700S和T700G。
채용장발사소묘전자현미경、엄각X사선연사、원소분석、고분변투사전자현미경대동려T700S、T700G화동방UT500 3충탄섬유적표면화단면형모、화학조성급석묵미정등미관조직결구진행료표정,비교료저3충탄섬유적미관결구차이,병분석료저사차이대역학성능적영향。결과표명,T700G탄원소함량교고,담원소함량교저,타적석묵미정척촌교대,취향도교고,저시타비T700S랍신모량고단단렬신장솔저적원인;UT500적표면결구여단면결구불여T700S화T700G호,미정척촌야교소,단타적직경략세,이차석묵미정내（002）정면배렬비T700S화T700G경규정,도치UT500적종합역학성능략우우T700S화T700G。
Field emission scanning electron microscope, X-ray diffractometer, elemental analysis and high-reso- lution transmission electron microscope were used to characterize the surface and fracture feature, chemical composition and graphite microcrystalline structure of three kinds of carbon fibers including Toray T700S, T700G and Toho UT500. The microstructure differences of the three carbon fibers were compared and the effects of these differences in mierostructure on mechanical properties of carbon fiber were analyzed. Rustles showed that TT00G has a higher carbon content and a lower nitrogen content, larger graphite crystallite size and orientation degree, which are the reasons that it has higher tensile modulus but lower elongation at break than T700S; surface and fracture feature of UT500 were slightly worse than T700S and T700G and its graphite crys- tallite size is smaller; however, the diameter of UT500 is a little thinner and the （002） crystal faces in graphite microcrystalline arrange more ordered than TT00S and TT00G, which cause the comprehensive mechanical prop- erty of UT500 is a bit better than that of T700S and T700G