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首页> 外文会议>International SAMPE Technical Conference >CARBON NANOTUBES ON CARBON FIBERS: INFLUENCE OF GROWTH CONDITIONS ON FIBER TENSILE PROPERTIES
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CARBON NANOTUBES ON CARBON FIBERS: INFLUENCE OF GROWTH CONDITIONS ON FIBER TENSILE PROPERTIES

机译：碳纤维上的碳纳米管：生长条件对纤维拉伸性能的影响

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The interface between carbon fibers (CFs) and the resin matrix in traditional high performance composites is characterized by a large discontinuity in mechanical, electrical, and thermal properties which can cause inefficient energy transfer. Due to the exceptional properties of carbon nanotubes (CNTs), their growth at the surface of carbon fibers is a promising approach to controlling interfacial properties and achieving enhanced properties. However, the reactive conditions used to grow carbon nanotubes also have the potential to introduce defects that can degrade the tensile properties. In this study, high density multi-wall carbon nanotubes were grown directly on IM-7 and T650 carbon fiber using thermal chemical vapor deposition (CVD). The influence of CVD growth conditions on the single-fiber tensile properties and CNT morphology was investigated. The mechanical properties of sized fibers were shown to be sensitive to CVD growth conditions with significant decreases in properties at temperatures above 700 deg C. In contrast, the tensile properties of the unsized T650 fibers after growth of aligned CNTs at 750 deg C were similar to the initial untreated fiber. When the growth temperature was raised to 800 deg C and the flow rate of the reactive xylene/ferrocene mixture was increased, a non- aligned CNT morphology was obtained for the unsized T650 fiber. This demonstrated the capability to vary CNT morphology. However, the tensile properties of the fibers were degraded relative to those grown at 750 deg C. At a growth temperature of 700 deg C, no appreciable growth was obtained. In short, it is possible to vary the morphology of the CNTs grown on CF and to obtain CNT/CF assemblies with equivalent tensile properties to that of the initial fibers by varying CVD growth conditions and proper selection of the carbon fiber. Thus, growing CNT on the CF provides a viable means to tailor the thermal, electrical and mechanical interfacial properties of composites without necessarily sacrificing tensile properties.
机译：碳纤维（CFS）和在传统的高性能复合材料中的树脂基体之间的界面的特征在于，在机械，电气和热特性的大的不连续性可导致低效率的能量传送。由于碳纳米管的优异性能（CNT）的，在碳纤维的表面的生长是一种有前途的方法来控制界面性质和实现增强的性能。然而，用于生长碳纳米管的反应条件也有介绍，可以降低拉伸性能缺陷的可能性。在这项研究中，高密度的多壁碳纳米管，使用热化学气相沉积（CVD）直接生长在IM-7和T650碳纤维。的CVD生长条件对单纤维的拉伸性能和CNT形态的影响进行了研究。尺寸的纤维的机械性能被证明是与在温度高于700℃。在对比度特性显著降低CVD生长条件是敏感的，对准的CNT的生长之后的未施胶T650纤维在750摄氏度的拉伸性质类似于初始未处理纤维。当生长温度升高至800℃，并反应二甲苯的流量/二茂铁的混合物增加，为未施胶T650纤维得到的非取向CNT形态。这证明，以改变CNT形态的能力。然而，该纤维的拉伸性能是相对于在750摄氏度的那些生长在700摄氏度的生长温度降低，得到没有明显增长。总之，它是可以改变生长在CF CNT的形态和通过改变CVD生长条件和碳纤维的适当选择，以获得具有同等的拉伸特性与初始纤维的CNT / CF组件。因此，在CF生长CNT提供了一种可行的手段来裁缝复合材料的热，电和机械界面性质，而不必牺牲拉伸性能。

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