黏结剂喷射3D打印关键技术

Key technology of binder jet 3D printing

黏结剂喷射成型技术是一种新型低成本高速增材制造技术,本文首先对黏结剂喷射成型技术的工艺原理以及打印步骤进行了介绍,并对国内外部分黏结剂喷射金属3D打印机的参数、优点、应用等进行了总结。列举了打印过程中使用的黏结剂类别,分析了黏结剂和粉末床之间相互作用的方式及影响(溅射、扩散、渗透等),讨论了不同变量对最终零件性能和精度的影响,包括粉末性能(粉末流动性、粒度分布和平均尺寸)、打印参数(层厚、黏结剂饱和度、打印速度、液滴间距和线间距、干燥时间)、后处理工艺(固化脱脂、烧结、渗透)。喷射粘接技术是未来关键材料增材制造的重要发展方向,在对应材料开发、黏结剂设计与后处理工艺方面将有广阔的研究与应用前景。

Binder jetting is a promoted 3D printing technology with the advantages of low equipment cost,high manufacturing speed.Technical principle and procedure were firstly introduced,and the parameter,advantage and application of present commercial binder jetting system were summarized.The types of binder used in the printing process were listed.The interaction(sputtering,diffusion and permeation)between binder types and powder bed was analysed.In addition,the influence of printing parameters on the performance and accuracy of the printed part was also discussed,including powder properties(powder flowability,powder size distribution and mean size),printing parameters(layer thickness,binder saturation,print speed,droplet spacing and line spacing,drying time),post-treatment process(curing,burnout,sintering,infiltration).Binder jetting technology is an important development direction of additive manufacturing.There will be broad research and application prospects in the development of corresponding materials,binder design and post-treatment technology.