| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| 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 |
Ceramic On-demand Extrusion (CODE) of Functionally Graded ZrB<sub>2</sub>-Mo |
| Author(s) |
Austin J. Martin, Sachin Choudhary, Jeremy L. Watts, Gregory E. Hilmas, Ming C. Leu, Tieshu Huang |
| On-Site Speaker (Planned) |
Austin J. Martin |
| Abstract Scope |
Functionally graded materials (FGMs) involve the spatial variation of chemical composition or structure, typically to achieve an optimization of material properties. Ultra-high temperature ceramics (UHTCs) are classified as materials that have melting points above 3000°C, and although UHTCs can retain high strengths and oxidation resistance at high temperatures (>1500°C), these materials are typically brittle and therefore may benefit from underlying ductile or higher fracture toughness substructure. Molybdenum (Mo) alloys such as Mo-Si-B or Ti-Zr-Mo (TZM) are high temperature (~1000°C), creep resistant alloys which have improved fracture toughness (RT ~10 MPa∙√m or greater) compared to pure zirconium diboride (ZrB<sub>2</sub>). In this research, an active mixer equipped with dual extruders was used to adjust composition throughout printing to produce ZrB<sub>2</sub>-Mo graded structures. ZrB<sub>2</sub> and Mo paste development and the respective optimizations for co-printing will be reviewed. Finally, chemical and processing constraints on co-printing, co-shrinkage, and cofiring of ZrB<sub>2</sub>-Mo FGMs will be examined. |