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
The atomic oxygen exposure test was conducted by the space combined radiation simulator.The effect of the atomic oxygen irradiation on high-modulus carbon fibers and its composites was investigated by
To enhance antioxidant properties, SiBCN coatings were prepared on SiC fibers by dip-coating and pyrolysis ofpolyborosilazane (PBSZ) solution.The morphology, composition, structure, strength and oxida