|About this Abstract
||Materials Science & Technology 2020
||Additive Manufacturing of Ceramic-based Materials: Process Development, Materials, Process Optimization and Applications
||Direct Ink Writing of Chopped Fiber Ultra-High Temperature Ceramic Matrix Composites (UHTCMCs)
||Lisa Rueschhoff, Zlatomir Apostolov, James William Kemp, Brett Compton, Abel Diaz, Surya Kalidindi, Brendan Croom
|On-Site Speaker (Planned)
Current ultra-high temperature ceramics (UHTCs) are limited in many aerospace applications by low fracture strength and toughness. The use of a reinforcing fiber phase within a UHTC matrix can enhance both strength and damage tolerance while the use of additive manufacturing (AM) will help overcome the challenges in manufacturing complex-shaped components. In this work, the AM technique of direct ink writing (DIW) is used to extrude a preceramic polymer based slurry to build up complex structures of chopped fiber UHTC ceramic composites (UHTCMCs). An additional benefit of the DIW process is the ability to align high aspect ratio reinforcement phase for enhanced mechanical performance. Slurries consist of commercial silicon carbide preceramic polymer highly loaded (>40 vol.%) with ZrB2 powder and chopped SiC fiber (up to 10 vol.%). Pyrolysis experiments have been carried out at 1200 and 1600 oC with fiber distribution and orientation explored through microscopy and x-ray CT analysis.