Effect of Growth Temperature on Carbon Nanotube Grafting Morphology and Mechanical Behavior of Carbon Fibers and Carbon/Carbon Composites
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2017年第1期
论文作者：Lei Feng Ke-Zhi Li Jin-Hua Lu Le-Hua Qi
文章页码：65 - 70
摘 要：High-purity carbon nanotubes（CNTs） with different orientation and lengths were grafted on carbon fibers（CFs） in woven fabrics by using double injection chemical vapor deposition and adjusting the growth temperature.Scanning electron microscopy（SEM）,transmission electron microscopy（TEM） and Raman investigations reveal that the grafted CNTs change from being predominantly aligned and uniform in diameter to absolutely disordered and variable in diameter,whilst they show significantly increased crystallinity,as the growth temperature is increased from 730 °C to 870 °C.In tensile tests of fiber bundles,much more strength degradation of CFs was observed after the growth process at higher temperature than that at lower temperature.These hybrid preforms produced at different growth temperatures were used to reinforce carbon/carbon（C/C） composites.An increment of 34.4% in out-of-plane compressive strength（OCS） was obtained for the composites containing CNTs grown at 730 °C,while the OCS increment exhibits an obvious decrease with increasing the growth temperature.Compared with the higher growth temperature,the lower temperature contributes to the decrease in the strength loss of reinforcing fibers and meanwhile the growth of large extending length of CNTs,which can provide long reinforcement to the pyrocarbon matrix,and thus increase the compressive strength better.
Lei Feng1，Ke-Zhi Li1，Jin-Hua Lu1，Le-Hua Qi2
1. State Key Laboratory of Solidification Processing,Carbon/Carbon Composites Research Center,Northwestern Polytechnical University2. School of Mechatronic Engineering,Northwestern Polytechnical University
摘 要：High-purity carbon nanotubes（CNTs） with different orientation and lengths were grafted on carbon fibers（CFs） in woven fabrics by using double injection chemical vapor deposition and adjusting the growth temperature.Scanning electron microscopy（SEM）,transmission electron microscopy（TEM） and Raman investigations reveal that the grafted CNTs change from being predominantly aligned and uniform in diameter to absolutely disordered and variable in diameter,whilst they show significantly increased crystallinity,as the growth temperature is increased from 730 °C to 870 °C.In tensile tests of fiber bundles,much more strength degradation of CFs was observed after the growth process at higher temperature than that at lower temperature.These hybrid preforms produced at different growth temperatures were used to reinforce carbon/carbon（C/C） composites.An increment of 34.4% in out-of-plane compressive strength（OCS） was obtained for the composites containing CNTs grown at 730 °C,while the OCS increment exhibits an obvious decrease with increasing the growth temperature.Compared with the higher growth temperature,the lower temperature contributes to the decrease in the strength loss of reinforcing fibers and meanwhile the growth of large extending length of CNTs,which can provide long reinforcement to the pyrocarbon matrix,and thus increase the compressive strength better.
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