Additive manufacturing of embedded carbon nanocomposite structures with multi-material digital light processing (MMDLP)
Additive manufacturing of embedded carbon nanocomposite structures with multi-material digital light processing (MMDLP)
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DOI：
10.1557/s43578-021-00224-3
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发表时间：
2021-05-10
影响因子：
2.7
通讯作者：
Ma, Anson W. K.
中科院分区：
文献类型：
--
作者：
Kang, SeungYeon;Chang, Shing-Yun;Ma, Anson W. K.
加法制造已经成为一种日益强大的制造复杂三维微结构的技术，可用于各种应用。尽管有多种AM技术支持以逐渐更高的吞吐量、更大的构建尺寸和更精细的空间分辨率进行单材料打印，但尚未展示其中一种材料为填充复合材料的交错结构的多材料打印。这项工作旨在演示使用定制的多材料数字光处理(MMDLP)3D打印机制造这种异质结构的技术可行性。打印机配备了两个树脂分配器和一个空气喷嘴，可以在树脂之间快速交换-其中一个树脂填充了高达0.25%的碳纳米管(CNT)。碳纳米管的加入降低了树脂的固化深度，但显著降低了引发光聚合所需的临界曝光量。这些信息被成功地用于选择合适的工艺参数来打印复杂的碳纳米管填充的多材料结构。
Additive manufacturing (AM) has become an increasingly powerful technique for fabricating complex three-dimensional micro-architectures for a wide variety of applications. Despite the multitude of AM techniques that support single material printing at progressively higher throughput, larger build size, and finer spatial resolution, multi-material printing of interlaced structures with one of the materials being a filled composite has not been demonstrated. This work aims to demonstrate the technical feasibility of fabricating such heterogeneous structures using a custom-built multi-material digital light processing (MMDLP) 3D printer. The printer was equipped with two resin dispensers and an air-jet that enable fast exchange between the resins-one of which was filled with carbon nanotubes (CNTs) up to 0.25%. The inclusion of CNTs reduced the cure depth of the resins, but significantly lowered the critical exposure required to initiate the photopolymerization. This information was successfully used to select appropriate process parameters for printing complex CNT-filled multi-material structures.