Abstract
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.
Recommended Citation
A. Bratten et al., "Improved Additive Manufacturing of Silicon Carbide Parts Via Pressureless Electric Field-Assisted Sintering," International Journal of Applied Ceramic Technology, vol. 19, no. 5, pp. 2480 - 2488, Wiley, Sep 2022.
The definitive version is available at https://doi.org/10.1111/ijac.14105
Department(s)
Mechanical and Aerospace Engineering
Second Department
Materials Science and Engineering
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
text
Language(s)
English
Rights
© 2023 Wiley, All rights reserved.
Publication Date
01 Sep 2022
Included in
Aerospace Engineering Commons, Materials Science and Engineering Commons, Mechanical Engineering Commons
Comments
U.S. Nuclear Regulatory Commission, Grant NRC 31310018M0044