About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
|
Additive Manufacturing of Ceramic-based Materials: Process Development, Materials, Process Optimization and Applications
|
Presentation Title |
Multi-material Printing of Reaction Bonded Carbides by Robocasting |
Author(s) |
Larissa Wahl, Michelle Weichelt, Nahum Travitzky |
On-Site Speaker (Planned) |
Larissa Wahl |
Abstract Scope |
Reaction bonded boron carbide (RBBC) and reaction bonded silicon carbide (BRSC) composites were fabricated using multi-material robocasting followed by liquid silicon infiltration (LSI). Multi-material robocasting offers the possibility to combine materials and thus their properties, as demonstrated in this work with silicon carbide (SiC) and boron carbide (B4C). The feasibility of combining RBSC and RBBC was demonstrated by printing multilayer bending bars. The microstructure of the samples was investigated and, in particular, the interfaces at each processing step were studied. After LSI, cracks were observed in the B4C layers due to differences in thermal expansion, but the interfaces showed no delamination and good interfacial bonding between the layers was evident. Residual stresses in the layers, which were theoretically calculated and further investigated by Raman measurements, could explain the cracking. By adjusting the paste composition, the stresses could be influenced and the crack formation prevented. |