在聚丙烯腈基碳纤维(PANCF)制备过程中会有40％-50％的重量损失，主要发生在300-800℃范围内。对PAN裂解失重行为的研究有利于理解PANCF类石墨结构的形成机理，并在工业上有助于提高炭化收率。本论文通过热重分析法(TGA)来模拟PAN的裂解失重过程，主要有三个主要裂解阶段。与惰性气氛相比在空气中进行稳定化能提高纤维抗裂解能力，碳化收率高。拉曼分析结果表明高氧含量容易在纤维中形成较多的结
利用原子氧暴露地面模拟实验装置，分别对BHM3型高模量碳纤维及其复合材料进行了原子氧辐照，采用SEM、XRD、XPS技术分析了原子氧对碳纤维及其复合材料的侵蚀行为。结果 表明，经过不同辐射剂量的原子氧辐照，碳纤维及其复合材料质量损失率较低，纤维表面形貌及组成基本不变，复合材料的层间剪切性能略有下降。
在碳纤维表面形成SiC保护壳层,有利于改善碳纤维的高温抗氧化.本文以硅粉、二氧化硅粉为硅源,与碳纤维均匀混合后,直接利用微波加热,在微波功率3kW,辐射时间60s,气压约30kPa的条件下,快速高效地制备得到C/SiC同轴纤维.利用能谱分析仪(EDS)、X射线衍射仪(XRD)、场发射扫描电镜(SEM),以及透射电子显微镜(TEM)等分析测试手段,对合成样品进行了物相组成、微观形貌和晶体结构分析.结
The pseudo-graphite crystalline structure of carbon fiber is the origin of its excellent mechanical properties.During the structural transformation from organic to inorganic material for the carbon fi
As a typical auisotropic material, the mechanical properties of carbon fiber were determined by its orientation structure.During the preparation process of carbon fiber, the original crystalline orien
In the temperature range of 300-800℃, 40%-50% of the weight lost during the processing of polyacrylonitrile based carbon fiber (PANCF).Understanding the degradation behavior will aid in the understand
Infusible Poplar alkali lignin was converted to a fusible one as a raw material for activated carbon fibers by chemically modified and blended with a mixture of polyethylene glycol 400 (PEG 400) and s
High modulus carbon fiber composite is widely used in aerospace structural products due to its excellent characters, such as high specific stiffness, good dimension stability, ablation endurance and i
The effects of temperature and humidity on the mechanical and dielectric properties of the meta-aramid paper were studied.The results shows that the tensile strength of the meta-aramid paper is not af
SiC protective shell formed on the carbon fibers is beneficial to improve the high temperature oxidation resistance of carbon fibers.In this paper, C/SiC coaxial fibers have been rapidly synthesized b