Thermal conductivity of three-dimensional multi-material core-shell filament structures obtained by material extrusion
参考中译:材料挤压获得的三维多材料核壳丝结构的热传导性


          

刊名：Additive Manufacturing
作者：L. Moreno-Sanabria（Institute of Ceramics and Glass (ICV-CSIC)）
C. Ramirez（Institute of Ceramics and Glass (ICV-CSIC)）
M. I. Osendi（Institute of Ceramics and Glass (ICV-CSIC)）
M. Belmonte（Institute of Ceramics and Glass (ICV-CSIC)）
P. Miranzo（Institute of Ceramics and Glass (ICV-CSIC)）
刊号：780C0044/I
ISSN：2214-8604
出版年：2024
年卷期：2024, vol.81
页码：104018-1--104018-10
总页数：10
分类号：TH16
关键词：Robocasting；Coaxial；γ-alumina；Graphene nanoplatelets；Thermal conductivity；Finite element methods
参考中译：机器人铸造;同轴; γ-氧化铝;石墨烯纳米片;热传导性;有限单元法
语种：eng
文摘：Coaxial 3D structures based on ceramic materials with distinct properties are of great interest in a wide range of fields due to their enhanced ability to modulate structural and functional properties. In this work, 3D patterned structures based on bi-component filaments with a core-shell arrangement have been additively manufactured in a single step by material extrusion. A system has been designed consisting of two concentric syringes for simultaneous printing of pseudoplastic core and shell ceramic inks with a single pressure device. Aqueous boehmite and boehmite/graphene nanoplatelets (GNP) composite inks have been formulated. The rheology of both inks has been matched to ensure the printability and integrity of the boehmite (core)-composite (shell) layout and its reverse. The as-printed coaxial scaffolds have been treated at 500℃ for 2 h in nitrogen atmosphere to transform boehmite to γ-alumina while the GNP remain undamaged. The thermal properties and the heat transfer of these robust coaxial structures have been experimentally analysed using the transient pulse source method and a high-resolution infrared camera, respectively. Besides, they have been theoretically simulated by finite element methods. These coaxial architectures promote higher thermal anisotropy as compared to monomaterial scaffolds, allowing better control of the heat fluxes. The mechanical behaviour of the different lattice materials has been assessed through compression tests to calculate the strength and the apparent elastic modulus; and the fracture surface of the lattice struts after failure has also been examined.
参考中译：基于具有不同性质的陶瓷材料的同轴三维结构由于其增强的结构和功能特性的调节能力而在广泛的领域中引起了极大的兴趣。在这项工作中，通过材料挤压一步完成了基于核壳排列的双组分纤维的3D图案化结构的制造。设计了一种由两个同心注射器组成的系统，可以用一个加压装置同时打印假塑芯和壳陶瓷油墨。研制了水性薄水铝石和薄水铝石/石墨烯纳米板(GNP)复合油墨。两种油墨的流变性已经匹配，以确保薄水铝石(芯)-复合(壳)布局及其反面的可印刷性和完整性。印制的同轴支架在氮气气氛中于500℃下处理2 h，使薄水铝石转变为γ-Al_2O_3，而国民生产总值保持不变。分别用瞬变脉冲源方法和高分辨率红外相机对这些耐用同轴结构的热性能和热传递进行了实验分析。并用有限元方法对其进行了理论模拟。与单材料支架相比，这些同轴结构促进了更高的热各向异性，从而允许更好地控制热通量。通过计算强度和表观弹性模数的压缩试验，对不同格子材料的力学性能进行了评价，并对破坏后的格子杆断口进行了分析。



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