热重分析仪研究中间相沥青纤维的炭化  

Investigating Carbonization of Mesophase Pitch Fibers by Thermo-gravimetric Analysis

作　　者：余芬[1,2] 陈雷[1] 费又庆[1,2] 

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082 [2]湖南大学汽车车身先进设计与制造国家重点实验室,湖南长沙410082

出　　处：《矿冶工程》2016年第4期100-103,108,共5页Mining and Metallurgical Engineering

基　　金：湖南大学汽车车身先进设计与制造国家重点实验室课题(734215002)

摘　　要：采用热重分析方法对不同氧化条件下制备的沥青预氧化纤维的炭化失重过程进行了跟踪研究,利用傅里叶变换红外光谱(FT-IR)、热重质谱联用(TG-MS)、扫描电镜以及纤维强伸仪分析了氧化纤维的官能团和炭化过程形成的气相产物的分布,以及炭纤维产品的微观结构和力学性能。结果表明:不同氧化条件下制备的预氧化纤维的炭化DTG曲线在起始失重温度、最大失重速率以及碳收率等方面具有明显的差异。随着氧化程度提高和纤维内部交联加深,失重曲线上的炭化反应向高温推移,碳收率下降,得到的碳纤维芯部微晶熔融得以控制,并且力学性能改善。但氧化过度时碳纤维的力学性能会明显下降。利用TG研究沥青纤维的炭化过程对氧化工艺的制定以及结构、性能预测具有一定的指导意义。The weight loss during the carbonization of mesophase pitch fibers under different oxidation conditions was monitored by thermogravimetric analysis( TG). The functional groups of the oxidized fibers,the distribution of gas products,as well as the microstructure and mechanical properties of the carbonized fibers in the process of carbonization were characterized by Fourier transform infrared spectroscopy( FT-IR),thermogravimetric mass spectrometry( TG-MS),scanning electron microscopy( SEM) and single filament tensile test. The results indicated that the carbonization DTG curves of the pre-oxidized fiber had significant differences in an initial weight-loss temperature,maximum weight-loss rate and carbon yield. With the intensification of oxidation and internal cross-linking of the pitch fibers,the carbonization reaction was shifted to higher temperature on the weight-loss curve while the carbon yield decreased,leading to carbon fibers with fusion-free core crystallites and improved mechanical properties. But excessive oxidation could result in poor mechanical properties. Thus,investigating the carbonization process of pitch fibers with thermogravimetric analysis has benefits for establishing oxidation process and predicting the structure and performance of carbon fibers.

关 键 词：碳纤维 中间相沥青纤维 热重分析 炭化 氧化 

分 类 号：TB334[一般工业技术—材料科学与工程]