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Meeting MS&T21: Materials Science & Technology
Symposium Additive Manufacturing of High and Ultra-High Temperature Ceramics and Composites: Processing, Characterization and Testing
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 3000C, and although UHTCs can retain high strengths and oxidation resistance at high temperatures (>1500C), 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 (~1000C), 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.
Proceedings Inclusion? Planned: Other (journal publication, etc.; describe below)

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Additive Manufacturing of Aqueous Based Silicon Nitride Suspensions via Direct Writing
Additive Manufacturing of Corrosion Resistant UHTC Materials for Chloride Salt-to-sCO2 Brayton Cycle Heat Exchangers
Additive Manufacturing of High-performance Advanced Ceramics by the Ceramic On-demand Extrusion (CODE) Process
Additive Manufacturing of Silicon Nitride Using a Slurry Approach
Additive Manufacturing of ZrB2–ZrSi2 Composites Using an Electron Beam Melting (EBM) Process
Additive Manufacturing Of ZrB2-SiC Heat Exchanger Geometries by Ceramic on Demand Extrusion
Additive Slurry Drying as a Novel Method for Realizing Large Ceramic Components Using AM
Advanced Polymer-derived (Ultra)-high-temperature Resistant Ceramics and Ceramic Nanocomposites for Additive Manufacturing
AM of UHTCs at LLNL
Binder Jet Additive Manufacturing of Novel Design, High Temperature, Ceramic Heat Exchangers
Ceramic On-demand Extrusion (CODE) of Functionally Graded ZrB2-Mo
Deposition of UHTC Coatings on Refractory Substrates by Directed Energy Methods
High Temperature Properties of Polymer-derived Ceramic Matrix Composites Fabricated via Additive Manufacturing
Innovative Route for the 3D Printing of Hybrid Silicon Carbide/Carbon Fiber Nanocomposites
Investigation of Oxidation Behavior of ZrB2-SiC Composites under Different Partial Pressures of Oxygen
Molten Chloride Salt Corrosion Testing of Ultra High Temperature Ceramics for High Temperature Heat Exchangers Fabricated by Additive Manufacturing Methods
Pathways to Additively Manufacture Ultra-high Temperature Ceramic Composites
Process Development and Optimization for The Laser Powder Bed Fusion of WC-Ni Cermet Composites
Strategies for Printing Continuous Fibers and Post-processing for Ceramic Matrix Composites (CMCs)

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