造粒石墨粉粘结剂喷射3D打印成型工艺与性能研究  

Investigation on Forming Processing and Performance for Binder Jetting 3D Printing of Pelletized Graphite Powder

作　　者：刘于青 何玉玉 马龙 王勇 罗凯 张芸芸 剡秀秀 李天才 曹继伟 LIU Yuqing;HE Yuyu;MA Long;WANG Yong;LUO Kai;ZHANG Yunyun;YAN Xiuxiu;LI Tiancai;CAO Jiwei(Intelligent Machinery Limited,Yinchuan 750021,China)

机构地区：[1]共享智能装备有限公司,银川750021

出　　处：《材料导报》2024年第S02期81-84,共4页Materials Reports

基　　金：自治区重点研发计划项目(2023BEE01010)。

摘　　要：石墨材料在核工业和铸造等领域具有很大的应用潜力,但部分增材制造技术效率低、成本高,导致其产业化进展缓慢。粘结剂喷射3D打印技术适合多种材料的复杂结构制造,但石墨材料密度低,粉末流动性差,成型强度低,相比其他陶瓷材料更难打印。本工作通过对石墨粉末进行改性造粒以满足粘结剂喷射3D打印对粉体流动性的要求,实现了复杂石墨生坯的3D打印成型。实验结果表明,使用改性石墨粉末打印的石墨生坯外形结构完整,石墨生坯的抗弯强度最高可达0.65 MPa。所打印石墨坯体的表面质量较好,力学性能基本满足微细石墨结构件后续工艺要求。该技术可实现高性能、高附加值、定制化石墨的有效制造,进一步拓宽复杂石墨结构件应用范围,有利于推动石墨3D打印的产业化发展。Although graphite materials have a lot of potential for use in the casting and nuclear industries,their industrialization has been sluggish,which is explained by the high costs and limited efficiency of several additive manufacturing technologies.The complex structure fabrication of many materials can be accomplished with binder jetting 3D printing technology;however,graphite materials pose special challenges because of their low density,poor powder flowability,and low green strength,which make them more difficult to print than other ceramic materials.In order to meet the flowability requirements for binder jetting 3D printing,we adjusted and pelletized graphite powder in this work.This allowed us to successfully shape complicated graphite green bodies after printing.With a maximum flexural strength of up to 0.65 MPa,the experimental results showed that the graphite green bodies printed with modified graphite powder displayed perfect structural integrity.The printed graphite blanks had a comparatively good surface quality,and their mechanical characteristics are generally satisfactory for fine-grain graphite structural component processing later on.This technology considerably broadens the variety of applications for complex graphite structures and advances the industrialization of graphite 3D printing by enabling the efficient fabrication of high-performance,high-value-added,and customized graphitic components.

关 键 词：粘结剂喷射 3D打印技术 饱和度 粉末造粒 

分 类 号：TQ174.5[化学工程—陶瓷工业] TP391.73[化学工程—硅酸盐工业]