Enhancement of Through-Thickness Thermal Transport in Unidirectional Carbon Fiber Reinforced Plastic Laminates due to the Synergetic Role of Carbon Nanofiber Z-Threads
Enhancement of Through-Thickness Thermal Transport in Unidirectional Carbon Fiber Reinforced Plastic Laminates due to the Synergetic Role of Carbon Nanofiber Z-Threads
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DOI：
10.1155/2019/8928917
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发表时间：
2019-01
影响因子：
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通讯作者：
Alexander M. Scruggs;S. Kirmse;K. Hsiao
中科院分区：
文献类型：
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作者：
Alexander M. Scruggs;S. Kirmse;K. Hsiao
本研究通过实验和分析检验了碳纳米纤维 (CNF) z 线对单向碳纤维增强塑料 (CFRP) 的全厚度（即 z 方向）导热系数的影响。据推测，CFRP 内的 CNF z 线网络将在整个样品厚度上提供导热微观结构，从而提高全厚度导热率。实验表明，CNF z 螺纹 CFRP 的全厚度导热系数 (9.85 W/m-K) 比对照 CFRP (1.31 W/m-K) 高约 7.53 倍，比未对齐 CNF 改性 CFRP (3.61 W/m-K) 高 2.73 倍。因此，我们发现 CNF z 螺纹在提高 CFRP 的全厚度导热系数方面发挥着重要作用。为了更好地理解 CNF z 线在全厚度热传输中的作用，构建了 CFRP 的简单逻辑模型，然后与实验结果进行比较。通过这些分析，确定 CNF z 线通过在整个 CFRP 层压板中创建碳纤维-CNF 连接，从而显着增强全厚度导热率；这些连接允许热流在很大程度上绕过包裹碳纤维的电阻树脂。此外，热红外测试表明，CNF z 螺纹 CFRP 增加的全厚度导热率可以实现层压板内缺陷的定位和可视化，而对照 CFRP 则无法做到这一点。
This study experimentally and analytically examined the influence of carbon nanofiber (CNF) z-threads on the through-thickness (i.e., z-direction) thermal conductivity of unidirectional carbon fiber reinforced plastics (CFRPs). It was hypothesized that a network of CNF z-threads within CFRPs would provide a thermally conductive microstructure throughout the sample thickness that would increase the through-thickness thermal conductivity. The experiments showed that the through-thickness thermal conductivity of the CNF z-threaded CFRPs (9.85 W/m-K) was approximately 7.53 times greater than that of the control CFRPs (1.31 W/m-K) and 2.73 times greater than that of the unaligned CNF-modified CFRPs (3.61 W/m-K). Accordingly, the CNF z-threads were found to play a substantial role in increasing the through-thickness thermal conductivity of CFRPs. To better understand the role of the CNF z-threads in through-thickness thermal transport, simple logical models of the CFRPs were constructed and then compared with the experimental results. Through these analyses, it was determined that CNF z-threads substantially enhance the through-thickness thermal conductivity by creating carbon fiber-CNF linkages throughout the CFRP laminate; these linkages allow the heat flow to largely bypass the resistive resin that envelops the carbon fibers. In addition, thermal infrared tests illustrated that the increased through-thickness thermal conductivity of the CNF z-threaded CFRP enabled the location and visualization of defects within the laminate, which was not possible with the control CFRP.