3D printing of aluminum oxide via composite extrusion modeling using a ceramic injection molding feedstock

被引:18
作者
Dreier, Tim [1 ]
Riaz, Abdullah [1 ]
Ahrend, Alexander [1 ]
Polley, Christian [1 ]
Bode, Stefanie [1 ]
Milkereit, Benjamin [2 ,3 ]
Seitz, Hermann [1 ,3 ]
机构
[1] Univ Rostock, Fac Mech Engn & Marine Technol, Chair Microfluid, Justus Von Liebig Weg 6, D-18059 Rostock, Germany
[2] Univ Rostock, Fac Mech Engn & Marine Technol, Chair Mat Sci, Albert Einstein Str 2, D-18059 Rostock, Germany
[3] Univ Rostock, Dept Life Light & Matter, Albert Einstein Str 25, D-18059 Rostock, Germany
关键词
Additive manufacturing; Ceramic injection molding feedstock; Composite extrusion modeling; Green density; Shrinkage; Parameter optimization; PERFORMANCE; FABRICATION; AL2O3; PARTS;
D O I
10.1016/j.matdes.2023.111806
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Composite Extrusion Modeling (CEM) is a screw-based material extrusion (MEX) additive manufacturing process that can produce plastic, metal and ceramic parts based on standard injection molding feed-stocks. In this work, an aluminum oxide feedstock (Al2O3) originally developed for injection molding is processed via a screw-based MEX process for the first time by depositing the plasticized material in layers on the build platform. In order to identify appropriate process parameters, the feedstock is first characterized to estimate the printable temperature processing window. Initially, the best printable extrusion values were estimated in terms of green part density and dimensional accuracy. Afterwards, different nozzle diameters and layer heights are investigated to further improve the green part density and shape accuracy. An extrusion multiplier of 0.14, nozzle diameter of 0.4 mm and a layer height of 0.1 mm were found to be the optimum process parameters to achieve highly dense green parts with a density of 2.7 91 & PLUSMN; 0.001 g/cm3. The optimized parts were also debound and sintered and the shrinkage was investigated. A shrinkage of 17.43% in the z direction and 14.08% in the x-y direction was observed, and a density of 3.92 & PLUSMN; 0.0025 g/cm3 was achieved for the sintered parts.& COPY; 2023 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
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页数:11
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