Improved Additive Manufacturing of Silicon Carbide Parts Via Pressureless Electric Field-Assisted Sintering
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. Pressureless 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.
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, American Ceramic Society, Sep 2022.
The definitive version is available at https://doi.org/10.1111/ijac.14105
Mechanical and Aerospace Engineering
Materials Science and Engineering
Keywords and Phrases
Extrusion Freeform Fabrication; Extrusion on Demand; Field-Assisted Sintering; Silicon Carbide
International Standard Serial Number (ISSN)
Article - Journal
© 2022 The American Ceramic Society, All rights reserved.
01 Sep 2022
This study was supported by a seed grant from the Advanced Manufacturing Signature Area of Missouri University of Science and Technology. Joshua Rittenhouse thanks the Office of Nuclear Energy of US Department of Energy for an Integrated University Program graduate fellowship. Haiming Wen also acknowledges the US Nuclear Regulatory Commission Faculty Development Program (award number: NRC 31310018M0044).