About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Advanced Manufacturing of High Temperature Ceramics and Composites: Processing, Characterization and Testing
|
| Presentation Title |
Robocasting SiC Using Sub-mm Nozzle Sizes |
| Author(s) |
Josh Robinson, Cooper Howard, Yuxuan Sun, Scott Misture |
| On-Site Speaker (Planned) |
Scott Misture |
| Abstract Scope |
SiC pastes were optimized for pressureless sintering at 2200C or lower temperatures and then further optimized to enable reliable 3-D printing using Hyrel extrusion printers. Sintering aids and additives were limited to small fractions in order to produce SiC that is both >95% dense and applicable for ultrahigh use temperatures. Pastes were optimized for 0.6 and 1.0 mm nozzle sizes, and parts were produced on the size scale of 8 by 8 by 2 cm tall using single-layer and as many as 4-layer wall thicknesses. Complex shapes that mimic wing leading edges and similar aerospace-relevant components have been produced by printing the optimized pastes, followed by controlled-humidity drying, and finally sintering in graphite crucibles at temperatures ranging from 2100 to 2200C. We demonstrate that crack-free drying is of critical importance, as is preparing the pastes using traditional and/or non-traditional methods for reducing agglomeration and improving mixedness. |