作者：Wang H, Guo Q, Yang J, Liu Z, Zhao Y, Li J, Feng Z, Liu L.
關鍵字：boron doping, carbon fibers, oxidation resistance
論文來源：期刊
具體來源：Carbon, 2013, 56(1): 296-308.
發表時間：2013年
Boron (B) was doped into polyacrylonitrile-based carbon ?bers (CFs) in various contents by exposing the CFs in a vapor of B by the decomposition of B 4 C. The structural evolution of B-doped CFs on different B concentrations and heat-treatment temperatures was studied using scanning electron microscope, transmission electron microscope, X-ray diffraction and Raman spectroscopy. It was found that introducing B changed the morphology of the CFs. At high temperatures, the strong erosion of B vapor, not only changed the primary structure of CFs, but also produced more ?aws. Structural analysis indicates that B is mostly substitutionally bonded within the graphene sheet regardless of the experimental conditions. As increasing from 2200 to 2600 C in the graphite crucible containing 10% B 4 C, the concentration of substitutional B increased progressively from 0.81 to 2.57 at.%. Thermogravimetric analysis revealed that B-doping greatly improved oxidation resistance of the CFs with the oxidation onset temperature increasing from 640 C (0 at.% B doped,2.1% weight loss) to about 800 C (3.65 at.% B doped, 0.3% weight loss). The correlation between structural evolution and oxidation resistance of B-doped CFs provides a new route for fabricating the CFs with oxidation resistance up to 800 C.