| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing of High and Ultra-high Temperature Ceramics and Composites: Processing, Characterization and Testing
|
| Presentation Title |
Heterogeneous Lattice Structure Ceramic-Refractory Metal Materials Created via Additive Manufacturing |
| Author(s) |
David J. Mitchell, Corson Cramer, Trevor Aguirre, Steven Bullock, Christopher Ledford, Michael Kirka, Austin Schumacher |
| On-Site Speaker (Planned) |
David J. Mitchell |
| Abstract Scope |
Refractory metals have high melting temperatures, but also have very high densities. Ceramics have high sublimation temperatures, high temperature oxidation resistance and relatively low densities. Both types of materials demonstrate relatively brittle failure behavior. Continuous fiber ceramic matrix composites (CMCs) have demonstrated that composite microstructures can provide a material with a brittle reinforcing phase and a brittle matrix phase that exhibits damage tolerance and graceful failure behavior. However, continuous fiber CMCs are very labor intensive and expensive to produce, limiting their applicability in many applications. To develop an additively manufactured high temperature composite material, refractory metal-ceramic heterogeneous structures were created. This was accomplished by creating a tungsten lattice structure via an electron beam additive manufacturing process, then adding the silicon carbide or zirconium diboride ceramic matrix by a powder infiltration process. The resultant structures were analyzed to identify chemical and phase composition as well as microstructure. |