Whisker orientation controls wear of 3D-printed epoxy nanocomposites
Whisker orientation controls wear of 3D-printed epoxy nanocomposites
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DOI：
10.1016/j.addma.2020.101515
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发表时间：
2020-12-01
影响因子：
11
通讯作者：
Krick, Brandon A.
中科院分区：
文献类型：
--
作者：
Grejtak, Tomas;Jia, Xiu;Krick, Brandon A.
增材制造使得能够设计具有可调机械性能的多材料复合材料。以往对含二氧化硅、粘土或纤维的环氧基复合材料的研究表明，通过控制纤维的取向和结构可以获得良好的力学性能。在这项工作中，构建方向和晶须取向对3D打印环氧基纳米复合材料的磨损性能的影响进行了研究。采用直写增材制造方法制备了环氧树脂-纳米粘土-PTFE-SiC纳米复合材料，该方法使SiC晶须沿着印刷路径取向，摩擦学结果表明，相对于滑动方向的构建方向和晶须取向的变化导致了这些纳米复合材料的磨损和摩擦各向异性。最好的磨损性能是用晶须印刷的纳米复合材料实现的，所述晶须垂直于滑动钢的相对表面取向，并且垂直于构建方向和印刷路径取向滑动。所有的纳米复合材料具有显着更好的磨损性能比未填充的环氧样品。结果表明，通过直写增材制造优化环氧基纳米复合材料中的晶须取向和排列可以提高磨损性能。这在优化多功能3D打印环氧树脂纳米复合材料时实现了额外的设计范例。
Additive manufacturing enables design of multi-material composite materials with tunable mechanical properties. Previous studies on epoxy-based composites containing silica, clays or fiber showed that favorable mechanical properties can be achieved by controlling the fiber orientation and architecture. In this work the effect of the build direction and whiskers orientation on the wear properties of 3D printed epoxy-based nanocomposites is investigated. Epoxy-nanoclay-PTFE-SiC nanocomposites are fabricated using a direct-write additive manufacturing method that enables one to orient the SiC whiskers along the printing path. Tribological results show that variations in build direction and whiskers orientation relative to the sliding direction cause anisotropy in wear and friction in these nanocomposites. The best wear performance was achieved with the nanocomposites printed with whiskers oriented perpendicular to the sliding steel counter-surface and slid orthogonally to the build direction and print path orientation. All nanocomposites had significantly better wear properties than the unfilled epoxy sample. The results suggest that optimizing the whisker orientation and alignment in epoxy-based nanocomposites through direct-write additive manufacturing increases the wear performance. This enables an additional design paradigm when optimizing multifunctional, 3D-printed epoxy nanocomposites.