4.7 Article

Fabrication of dense SiSiC ceramics by a hybrid additive manufacturing process

Journal

JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 105, Issue 2, Pages 786-793

Publisher

WILEY
DOI: 10.1111/jace.18134

Keywords

additive manufacturing; infiltration; LSI; PIP; preceramic polymer; SiSiC; SLS

Funding

  1. Scuola Universitaria Professionale della Svizzera Italiana

Ask authors/readers for more resources

This study reported the fabrication of Silicon infiltrated Silicon Carbide (SiSiC) components using a hybrid additive manufacturing process, combining 3D printing of polymeric preforms with controlled relative density and preceramic polymer infiltration followed by pyrolysis. The final densification was achieved via liquid silicon infiltration, resulting in a nearly fully dense material of beta-SiC and Si in specific volume fractions. This approach eliminates the need for adding ceramic powder to the infiltrating solution, offering an alternative AM method for producing SiSiC ceramics.
In this work, we report the fabrication of Silicon infiltrated Silicon Carbide (SiSiC) components by a hybrid additive manufacturing process. Selective laser sintering of polyamide powders was used to 3D print a polymeric preform with controlled relative density, which allows manufacturing geometrically complex parts with small features. Preceramic polymer infiltration with a silicon carbide precursor followed by pyrolysis (PIP) was used to convert the preform into an amorphous SiC ceramic, and five PIP cycles were performed to increase the relative density of the part. The final densification was achieved via liquid silicon infiltration (LSI) at 1500 degrees C, obtaining a SiSiC ceramic component without change of size and shape distortion. The crystallization of the previously generated SiC phase, with associated volume change, allowed to fully infiltrate the part leading to an almost fully dense material consisting of beta-SiC and Si in the volume fraction of 45% and 55% respectively. The advantage of this approach is the possibility of manufacturing SiSiC ceramics directly from the preceramic precursor, without the need of adding ceramic powder to the infiltrating solution. This can be seen as an alternative AM approach to Binder jetting and direct ink writing for the production of templates to be further processed by silicon infiltration.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available