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A study on mechanical properties of CNT-reinforced carbon/carbon composites

机译:碳纳米管/碳纤维复合材料的力学性能研究

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摘要

Carbon/carbon composites (C/C composites) possess superior characteristics of low density, high strength, extremely low coefficient of thermal expansion, and high fatigue resistance. In carbonization process, the high-temperature pyrolysis made of carbon, hydrogen, oxygen, and other elements results in a lot of voids and cavities generated in the interior of C/C composites. Therefore, the C/C composites are densified to fill the voids by using repeated impregnation. But densification is a time-wasting and complex process, which increases production costs in the manufacturing process. In this study, the multiwall carbon nanotubes (MWNTs) were adopted as a reinforcement material for C/C composites to reduce the existence of voids or cavities and enhance the mechanical properties of C/C composites. According to the experimental results, the CNT-added C/C composite containing 1.2wt% CNT possesses the greatest flexure strength, flexure modulus, and interlaminar shearing strength. Plus, the above-mentioned strength and modulus are increased by 23%, 19.2%, and 30%, respectively.
机译:碳/碳复合材料(C / C复合材料)具有低密度,高强度,极低的热膨胀系数和高抗疲劳性等优异特性。在碳化过程中,由碳,氢,氧和其他元素组成的高温热解会导致C / C复合材料内部产生大量的空隙和空腔。因此,通过重复浸渍,将C / C复合材料致密化以填充空隙。但是致密化是浪费时间和复杂的过程,这增加了制造过程中的生产成本。在这项研究中,多壁碳纳米管(MWNTs)被用作C / C复合材料的增强材料,以减少空隙或空腔的存在并增强C / C复合材料的机械性能。根据实验结果,含有1.2wt%CNT的添加CNT的C / C复合材料具有最大的挠曲强度,挠曲模量和层间剪切强度。另外,上述强度和模量分别增加了23%,19.2%和30%。

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