Binder jet 3D printing (BJ3DP) is an additive manufacturing technology that selectively deposits binder on powder to form a three-dimensional green body followed by sintering process. The low strength of green body and metallurgical issues limit the manufacture of Ti6Al4V parts with high-performance and that are lightweight. In this study, thermal-bubble inkjet technology was used to print Ti6Al4V parts via jetting low-concentration in-situ polymer binders. In addition, a method for mixing fine powder was used to enhance the capillary force of the powder bed and mechanical properties of the parts. The results show that the capillary force was enhanced from 8.35 kPa for pure powder to 16.27 kPa for mixed powder by mixing fine powder. The compression strength of green body was enhanced from 1.5 MPa to 3.21 MPa. After sintering, the sample with mixed powder sintered at 1420 °C for 2 h had achieved a maximum density of 95.2%, microhardness of 316 HV, and yield stress of 589 MPa. The relative density of 95.2% of Ti6Al4V parts fabricated by BJ3DP technology in our study is significantly higher than the value reported in the existing literature. Finally, the porous structure with a size of 550 μm was fabricated. Results presented demonstrate that BJ3DP can produce Ti6Al4V parts with excellent properties.

中文翻译：

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细粉混合提高高温烧结中粘结剂喷射印刷Ti6Al4V的毛细力和力学性能

粘结剂喷射3D打印（BJ3DP）是一种增材制造技术，可选择性地将粘结剂沉积在粉末上以形成三维生坯，然后进行烧结工艺。生坯的低强度和冶金问题限制了高性能，重量轻的Ti6Al4V零件的制造。在这项研究中，采用热气泡喷墨技术通过喷射低浓度的原位聚合物粘合剂来印刷Ti6Al4V零件。另外，使用混合细粉的方法来增强粉末床的毛细作用力和零件的机械性能。结果表明，通过混合细粉，毛细作用力从纯粉的8.35 kPa提高到混合粉的16.27 kPa。生坯的压缩强度从1.5 MPa提高到3.21 MPa。烧结后 混合粉末在1420°C下烧结2 h的样品的最大密度为95.2％，显微硬度为316 HV，屈服应力为589 MPa。在我们的研究中，通过BJ3DP技术制造的Ti6Al4V零件的95.2％的相对密度显着高于现有文献中报道的值。最后，制造了尺寸为550μm的多孔结构。提出的结果表明，BJ3DP可以生产具有优异性能的Ti6Al4V零件。