【摘 要】
：
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
【机 构】
：
YantaiMetastar Special Paper Co.,Ltd,National Aramid Engineering Technology Research Center,Shandong
【出 处】
：
第二届中国国际复合材料科技大会 (CCCM-2)
论文部分内容阅读
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 affected by temperature and humidity, but the elongation of the meta-aramid paper increased obviously with the humidity increasing.
其他文献
作为典型的各向异性材料，碳纤维的微晶取向结构是影响其力学性能的关键因素，聚丙烯腈原丝在热稳定化完成后，原有的微晶结构消失，碳纤维的微晶取向则在低温碳化过程中重新初步形成。本论文采用X-射线衍射法研究了碳纤维微晶取向形成的初始阶段，温度以及牵伸对微晶取向结构形成的影响规律，研究结果表明，在1000℃的低温碳化阶段，随着碳化温度的提高，由非碳元素的不断脱除引起的收缩张力导致形成的碳微晶沿轴向排列，取向
高模量碳纤维复合材料具有比刚度高、尺寸稳定性好、耐烧蚀性强及可整体设计等优异特性，在宇航结构产品上的应用比例不断增大。其增强体高模量碳纤维属于战略关键材料，国外对我国实行严格的技术封锁与战略物资禁运，实现该材料的自我保障对我国国防建设与航天事业发展具有重要的战略与实践意义。本文首先重点介绍了高模量碳纤维在我国宇航结构产品上的应用现状及需求，其次阐述了高模量碳纤维的特点、制备工艺、技术瓶颈及研究现状
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