About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
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Symposium
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Additive Manufacturing of High and Ultra-high Temperature Ceramics and Composites: Processing, Characterization and Testing
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Presentation Title |
Laser-induced Slip Casting for Additive Manufacturing of Large Ceramic Components |
Author(s) |
Shawn M. Allan, Yannik Zieger, Martin Schwentenwein, Johannes Homa |
On-Site Speaker (Planned) |
Shawn M. Allan |
Abstract Scope |
Additive manufacturing of advanced ceramics is steadily gaining importance for a wide variety of applications. Three common obstacles for ceramic AM are 1) long debinding times, 2) limitations to relatively small geometries, and 3) limited solutions for dark, non-oxide ultrahigh temperature ceramics (UHTCs). A novel aqueous-slurry based method, laser-induced slip casting (LIS), allows printing and subsequent sintering of large and bulky components. Via infrared lithographic exposure, thermal energy is generated that partially dries the suspensions and consolidates the structure with a high green density. The method is not dependent on the color or light-absorption of the ceramic powders, allowing dark materials such as carbides and other UHTCs to be processed. LIS has been applied to alumina, solid-state sintered silicon carbide, and silicon nitride (beta-sialon), yielding densities of approximately 99%. The resulting material strength is on par with conventional forming methods such as slip-cast or pressed ceramics. |