Welding of 3D-printed carbon nanotube-polymer composites by locally induced microwave heating.
Welding of 3D-printed carbon nanotube-polymer composites by locally induced microwave heating.
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DOI：
10.1126/sciadv.1700262
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发表时间：
2017-06
期刊：
影响因子：
13.6
通讯作者：
Green MJ
中科院分区：
文献类型：
--
作者：
Sweeney CB;Lackey BA;Pospisil MJ;Achee TC;Hicks VK;Moran AG;Teipel BR;Saed MA;Green MJ
碳纳米管的射频加热可以实现3D打印热塑性层之间的局部焊接和增加强度。通过材料挤出的增材制造（通常称为三维（3D）打印）是用于制造热塑性部件的新兴方法。然而，3D打印塑料零件在工程应用中面临的一个关键障碍是连续长丝迹线之间的弱焊接，这通常会导致分层和机械故障。这是使用热塑性增材制造的主要障碍。我们报告了一种通过微波辐射对碳纳米管（CNT）进行强烈局部加热来焊接3D打印热塑性界面的新概念。CNT-聚合物复合材料的微波加热是CNT逾渗的函数，如通过原位红外成像和模拟所示。我们将载有CNT的涂层应用于3D打印机灯丝;打印后，微波辐射显示出焊接断裂强度提高了275%。这些显著的结果为增材制造开辟了全新的设计空间，并对纳米材料网络的介电特性和射频场响应之间的耦合产生了新的见解。
RF heating of carbon nanotubes enables local welding and increased strength between 3D-printed thermoplastic layers. Additive manufacturing through material extrusion, often termed three-dimensional (3D) printing, is a burgeoning method for manufacturing thermoplastic components. However, a key obstacle facing 3D-printed plastic parts in engineering applications is the weak weld between successive filament traces, which often leads to delamination and mechanical failure. This is the chief obstacle to the use of thermoplastic additive manufacturing. We report a novel concept for welding 3D-printed thermoplastic interfaces using intense localized heating of carbon nanotubes (CNTs) by microwave irradiation. The microwave heating of the CNT-polymer composites is a function of CNT percolation, as shown through in situ infrared imaging and simulation. We apply CNT-loaded coatings to a 3D printer filament; after printing, microwave irradiation is shown to improve the weld fracture strength by 275%. These remarkable results open up entirely new design spaces for additive manufacturing and also yield new insight into the coupling between dielectric properties and radio frequency field response for nanomaterial networks.