This study describes for the first time the development of a silk powder-based 3D printing formulation that is compatible with Binder Jetting, a commercial additive manufacturing (AM) technique. The dynamic and bulk properties of the precursor powder were measured, including particle sizing, shape, flow energy, and compressibility, and the relationships between these properties, particle flow and printability were investigated. We used two different types of silk powder, super fine silk powder (SFSP) with an average particle size of 5 µm and fine silk powder (FSP), average particle size of 20 µm, and found that FSP provided good flow, spreadability and printability with polyvinyl alcohol (PVA) used as the solid binder. An optimized SP/PVA powder formulation was developed and successfully printed into intricate structures with a resolution as high as 200 µm. The printed green samples were analysed thoroughly to determine the printing performance, resolution, porosity, and mechanical strength. The compressive modulus of the printed SP/PVA parts reached 3 MPa, which was comparable to that of some ceramic printed parts. An effective infusing and immersion post-crosslinking method was developed and found to enhance the water stability of the printed constructs, making the printed parts suitable for potential load-bearing biomedical applications.

这项研究首次描述了基于丝绸粉末的3D打印配方的开发，该配方与Binder Jetting（商业增材制造（AM）技术）兼容。测量了前体粉末的动态和体积性质，包括颗粒尺寸，形状，流动能量和可压缩性，并研究了这些性质，颗粒流动性和可印刷性之间的关系。我们使用了两种不同类型的丝粉，平均粒径为5 µm的超细丝粉（SFSP）和平均粒径为20 µm的细丝粉（FSP），发现FSP具有良好的流动性，铺展性和可印刷性与聚乙烯醇（PVA）用作固体粘合剂。开发了一种优化的SP / PVA粉末配方，并成功将其打印成分辨率高达200 µm的复杂结构。彻底分析了印刷的绿色样品，以确定印刷性能，分辨率，孔隙率和机械强度。印刷的SP / PVA零件的压缩模量达到3 MPa，与某些陶瓷印刷零件的压缩模量相当。开发了一种有效的浸入和浸入后交联方法，发现该方法可增强印刷结构的水稳定性，使印刷部件适合潜在的承重生物医学应用。这可与某些陶瓷印刷零件相比。开发了一种有效的浸入和浸入后交联方法，发现该方法可增强印刷结构的水稳定性，使印刷部件适合潜在的承重生物医学应用。这可与某些陶瓷印刷零件相比。开发了一种有效的浸入和浸入后交联方法，发现该方法可增强印刷结构的水稳定性，使印刷部件适合潜在的承重生物医学应用。