Combining powder bed compaction and nanopowders to improve density in ceramic binder jetting additive manufacturing
Combining powder bed compaction and nanopowders to improve density in ceramic binder jetting additive manufacturing
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DOI：
10.1016/j.ceramint.2021.09.077
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发表时间：
2021-09
影响因子：
5.2
通讯作者：
Mohammadamin Moghadasi;Guanxiong Miao;Ming Li;Z. Pei;Chao Ma
中科院分区：
文献类型：
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作者：
Mohammadamin Moghadasi;Guanxiong Miao;Ming Li;Z. Pei;Chao Ma
本文报道了一种提高陶瓷粘结剂喷射增材制造密度的新方法：粉末床压实与纳米粉末相结合。使用氧化铝纳米粉在商用粘合剂喷射3D打印机上打印样品。当层厚为5 μm时，压实厚度在0、5、10、15、20和60 μm之间变化；当层厚为30 μm时，压实厚度在0、100和200 μm之间变化。测定了烧结密度和粉床密度。此外，研究了烧结样品的微观结构，重点研究了孔隙的数量和大小，以证实密度的结果。结果表明：在相同的层厚下，压实厚度越大，粉床密度越大，烧结密度越大，烧结试样中气孔数量和尺寸越小；在本研究中获得的最高烧结密度（72.0%）与文献中报道的氧化铝粘结剂喷射的最高密度相当，而不涉及不寻常的液体原料或特殊的后处理技术，证明了这种提高密度的新方法的有效性。
This paper reports a new approach to density improvement in ceramic binder jetting additive manufacturing: combining powder bed compaction and nanopowders. Samples were printed on a commercially available binder jetting 3D printer using an alumina nanopowder. Compaction thickness was varied across 0, 5, 10, 15, 20, and 60 μm at a layer thickness of 5 μm, and across 0, 100, and 200 μm at a layer thickness of 30 μm. Sintered density, as well as powder bed density, was measured. Furthermore, microstructure of sintered samples, with a focus on number and size of pores, was investigated to substantiate the density results. It was shown that at the same layer thickness, higher compaction thickness resulted in higher powder bed density, higher sintered density, and smaller number and size of pores in sintered samples. The highest sintered density (72.0%) achieved in this study was on par with the highest density reported in the literature on binder jetting of alumina without involving unusual liquid feedstocks or special post-processing techniques, demonstrating the effectiveness of this new approach to density improvement.