High solids loading silicon carbide (SiC)-based aqueous slurries containing only.5 wt. % organic additives were utilized to create specimens of various geometries via an extrusion-based additive manufacturing (AM) technique. Pressure less electric field-assisted sintering was performed to densify each specimen without deformation. The combination of these techniques produced parts with >98% relative density despite containing only 5 wt.% oxide sintering additives. After sintering, specimens contained only the α-SiC and yttrium aluminum perovskite phases. This suggests the evolution of a nonequilibrium yttrium aluminate phase, as well as transformation from β-SiC to α-SiC. The fabrication method presented in this work has advantages over other AM techniques commonly used with SiC, because it does not require significant organic additives nor additional postprocessing steps such as chemical vapor infiltration or polymer impregnation and pyrolysis.


Mechanical and Aerospace Engineering

Second Department

Materials Science and Engineering


U.S. Nuclear Regulatory Commission, Grant NRC 31310018M0044

Keywords and Phrases

extrusion freeform fabrication; extrusion on demand; field-assisted sintering; silicon carbide

International Standard Serial Number (ISSN)

1744-7402; 1546-542X

Document Type

Article - Journal

Document Version

Final Version

File Type





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Publication Date

01 Sep 2022