In this investigation, particulate composites materials made of epoxy resin matrix with magnetite particles were fabricated via additive manufacturing with the direct ink writing technique. Magnetite is an inexpensive material and the direct ink writing process is not only inexpensive but also easy to adapt to any material. A total of eight formulations were investigated, from which only four were feasible for the printing process: 32.6, 33.6, 35.4 and 41 wt.% of particles. The composites were characterized by scanning electron microscopy, compressive strength, particle size distribution, density, and ductility. Results showed that composites exhibit very competitive mechanical properties even though the process was not vacuum assisted, therefore enabling them to be used in large scale and in other structural applications. Composite can be used in electromagnetic shielding.

中文翻译：

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增材制造环氧树脂与磁铁矿颗粒复合材料的直接墨水书写技术

在这项研究中，由环氧树脂基体和磁铁矿颗粒制成的颗粒复合材料是通过增材制造和直接墨水书写技术制造的。磁铁矿是一种廉价材料，直接墨水书写工艺不仅价格低廉，而且易于适应任何材料。总共研究了八种配方，其中只有四种适用于印刷工艺：32.6、33.6、35.4 和 41 wt.% 的颗粒。通过扫描电子显微镜、抗压强度、粒度分布、密度和延展性对复合材料进行表征。结果表明，即使该过程没有真空辅助，复合材料也表现出非常有竞争力的机械性能，因此使其能够用于大规模和其他结构应用。