Abstract This study examines the effects of nanoparticle densifiers added to printing liquid on the mechanical performance and manufacturability of ceramics made using binder jetting. “Green” alumina samples were synthesized with filler particles of average particle size 40 μm embedded with nanoparticles of average size of 50 nm suspended in the printing liquid with varying concentration of 0–15 wt%. Samples were characterized for density, porosity, compressive strength, and printing liquid penetration depth in the filler powder layer assessed using surface tension testing. Results showed that the presence of the nanoparticle had a marked effect on the physical and mechanical properties of the samples whose relative density increased by about 30%. MicroCT imaging of the samples showed a decrease in interparticle pores with an addition of 15 wt% alumina nanoparticles. Compressive strength improved by 743%, from 76 kPa to 641 kPa as the densifier content was increased from 0 to 15 wt%. Surface tension of the printing liquid decreased from 44 mN/m to 23 mN/m with increasing densifier concentration from 0 to 15 wt% indicating that the penetration depth of the printing liquid would decrease with increasing densifier content. Implications of this approach on high density ceramic part printing efficiency are discussed in detail.

中文翻译：

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使用粘合剂喷射和纳米颗粒致密剂 3D 打印高密度陶瓷

摘要 本研究考察了添加到印刷液中的纳米颗粒致密剂对使用粘合剂喷射制造的陶瓷的机械性能和可制造性的影响。“绿色”氧化铝样品是用平均粒径为 40 μm 的填料颗粒合成的，其中嵌入了平均粒径为 50 nm 的纳米颗粒，悬浮在打印液中，浓度为 0-15 wt%。使用表面张力测试评估样品的密度、孔隙率、抗压强度和印刷液体在填料粉末层中的渗透深度。结果表明，纳米颗粒的存在对相对密度增加约30%的样品的物理和机械性能有显着影响。样品的显微 CT 成像显示，添加 15% 氧化铝纳米颗粒后，颗粒间孔隙减少。随着致密剂含量从 0 重量％增加到 15 重量％，压缩强度提高了 743%，从 76 kPa 提高到 641 kPa。随着增密剂浓度从 0 增加到 15 wt%，印刷液的表面张力从 44 mN/m 降低到 23 mN/m，表明印刷液的渗透深度会随着增密剂含量的增加而降低。详细讨论了这种方法对高密度陶瓷部件打印效率的影响。随着增密剂浓度从 0 增加到 15 wt%，印刷液的表面张力从 44 mN/m 降低到 23 mN/m，表明印刷液的渗透深度会随着增密剂含量的增加而降低。详细讨论了这种方法对高密度陶瓷部件打印效率的影响。随着增密剂浓度从 0 增加到 15 wt%，印刷液的表面张力从 44 mN/m 降低到 23 mN/m，表明印刷液的渗透深度会随着增密剂含量的增加而降低。详细讨论了这种方法对高密度陶瓷部件打印效率的影响。