About this Abstract |
Meeting |
MS&T21: 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 |
Additive Manufacturing Of ZrB<sub>2</sub>-SiC Heat Exchanger Geometries by Ceramic on Demand Extrusion |
Author(s) |
Nicholas M. Timme, Marharyta Lakusta, Jeremy L Watts, Gregory E Hilmas, William G Fahrenholtz, Ming C Leu, David W Lipke |
On-Site Speaker (Planned) |
Nicholas M. Timme |
Abstract Scope |
Zirconium diboride (ZrB<sub>2</sub>) belongs to a group of materials known as ultra-high temperature ceramics (UHTCs), which are characterized by melting temperatures exceeding 3000°C. Incorporation of silicon carbide (SiC) with ZrB<sub>2</sub> has shown to increase the strength, fracture toughness, and oxidation resistance. These materials are being investigated to produce heat exchangers intended for use in supercritical carbon dioxide (CO<sub>2</sub>) Brayton cycles operating at up to 1100°C and 250 bar because of their high thermal stability and thermal conductivity at this temperature.In the present work, a ZrB<sub>2</sub>-SiC paste was developed for dual-extrusion in the Ceramic on Demand Extrusion (CODE) process with an organic fugitive material. This process was used to produce geometries with continuous through channels, which were then pressurelessly densified to greater than 95% theoretical density. This presentation will examine the development and characterization of microchannel-style heat exchanger geometries produced via CODE and the constituent materials used for their manufacturing. |