Development of air pressure and screw extrudercomposite ceramic direct ink writing system
LIU Wenqiang1,2, WAN Yi1,2, SONG Qinghua1,2,WANG Jilai1,2, ZHANG Chengrui1,2, LIU Zhanqiang1,2
(1.Key Laboratory of HighEfficiency and Clean Mechanical Manufacture, Ministry of Education,Shandong University, Jinan 250061, China; 2.National Demonstration Center for Experimental  Mechanical Engineering Education,Shandong University, Jinan 250061, China)

Abstract: Aiming at solving the problem of direct ink writing of high solid fraction ceramic fluid above 90%, the progress of research and application of additive manufacturing in direct ink writing of ceramic was summarized. The rheological properties of ceramic fluid with high solid fraction and the structural design of extrusion screw were analyzed theoretically, the pressure and screw extrusion composite ceramic direct ink writing systemwas proposed. First of all, according to the nonNewtonian fluid rheological properties, the rotary screw was designed to provide the downward thrust and realize the fluid agitation, the bubbles in the cylinder also can be removed. Secondly, according to the technical principle of direct ink writing, a direct ink writing platform was set up. In the end, direct ink writing test was carried out on the high solid fraction ceramic fluid by using the direct ink writing platform. The results indicate that the direct ink writing system can realize direct ink writing of high solid fraction ceramic fluid.

Key words: additive manufacturing; screw extruder; high solid content ceramic fluid; direct ink writing